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Journal articles on the topic 'Push-off distance'

Author: Grafiati

Published: 31 May 2025

Last updated: 31 July 2025

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1

Trinidad, Alfonso, Santiago Veiga, Enrique Navarro, and Alberto Lorenzo. "The Transition from Underwater to Surface Swimming During the Push-off Start in Competitive Swimmers." Journal of Human Kinetics 72, no. 1 (2020): 61–67. http://dx.doi.org/10.2478/hukin-2019-0125.

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AbstractThe objective of the present study was to analyze (based on gender and the style of swimming) the kinematic parameters of the transition phase between underwater swimming and surface swimming after the push-off start in competitive national swimmers. Seventy-four swimmers participating in the Spanish Swimming Championships were filmed and analyzed by DLT-2D photogrammetry during the start with the push-off in crawl, backstroke and butterfly styles. Between genders there were small differences in the distance and speed of transition. The male swimmers travelled greater distances (0.84 ±

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2

Trinidad, Alfonso. "Kinematic analysis of the underwater glide phase during the push-off in competitive swimmers." PLOS ONE 19, no. 1 (2024): e0296101. http://dx.doi.org/10.1371/journal.pone.0296101.

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The aim of the study was to analyze the kinematic parameters of the push-off start during the underwater glide in competitive swimmers. 74 swimmers participating in the Spanish Championships were filmed and analyzed by DLT-2D photogrammetry after the push-off start in crawl, backstroke and butterfly. Between genders there were differences in distance and speed. Male swimmers covered greater distances (1.37±0.06 vs 1.20±0.05 m, η2 = 0.02, F = 3.85, p = 0.05) and were faster (2.36±0.03 and 2.08±0.03 m/s, η2 = 0.14, F = 36.14, p<0.001) than female swimmers. Between strokes there were greater d

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Bäcklund, Tomas, Helena Grip, Fredrik Öhberg, and Nina Sundström. "Single sensor measurement of heel-height during the push-off phase of gait." Physiological Measurement 42, no. 10 (2021): 105016. http://dx.doi.org/10.1088/1361-6579/ac325c.

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Abstract Objective. In healthy gait a forceful push-off is needed to get an efficient leg swing and propulsion, and a high heel lift makes a forceful push-off possible. The power of the push-off is decreased with increased age and in persons with impaired balance and gait. The aim of this study was to evaluate whether a wearable equipment (Striton) and algorithms to estimate vertical heel-height during gait from a single optical distance sensor is reliable and feasible for clinical applications. Approach. To assess heel-height with the Striton system an optical distance sensor was used to meas

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Jiménez-Reyes, Pedro, Pierre Samozino, Fernando Pareja-Blanco, et al. "Validity of a Simple Method for Measuring Force-Velocity-Power Profile in Countermovement Jump." International Journal of Sports Physiology and Performance 12, no. 1 (2017): 36–43. http://dx.doi.org/10.1123/ijspp.2015-0484.

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Purpose:To analyze the reliability and validity of a simple computation method to evaluate force (F), velocity (v), and power (P) output during a countermovement jump (CMJ) suitable for use in field conditions and to verify the validity of this computation method to compute the CMJ force–velocity (F–v) profile (including unloaded and loaded jumps) in trained athletes.Methods:Sixteen high-level male sprinters and jumpers performed maximal CMJs under 6 different load conditions (0–87 kg). A force plate sampling at 1000 Hz was used to record vertical ground-reaction force and derive vertical-disp

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Rozhkov, Vladyslav, Arkadiusz Stanula, Liliana Riadova, Daria Okun, and Svitlana Stadnyk. "BIOKINEMATIC CHARACTERISTICS OF THE TRIPLE JUMP TECHNIQUE IN QUALIFIED ATHLETES." Слобожанський науково-спортивний вісник 28, no. 1 (2024): 23–30. http://dx.doi.org/10.15391/snsv.2024-1.003.

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The purpose of the study is to investigate the biokinematic characteristics of the triple jump technique in qualified athletes. Material and methods. The technique of the final attempts of qualified triple jumpers during the 2023 World Athletics Championships was analyzed. The following methods were used in the work: analysis and synthesis of scientific and methodological literature, analysis of video materials, methods of mathematical statistics. The video of the final attempts was used, provided for public use by the International Athletics Federation (World Athletics). The attempts were rec

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Huang, Chao, Fuping Zhang, Zhengyi Xu, and Jianming Wei. "Adaptive Pedestrian Stride Estimation for Localization: From Multi-Gait Perspective." Sensors 22, no. 8 (2022): 2840. http://dx.doi.org/10.3390/s22082840.

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Accurate and reliable stride length estimation modules play a significant role in Pedestrian Dead Reckoning (PDR) systems, but the accuracy of stride length calculation suffers from individual differences. This paper presents a stride length prediction strategy for PDR systems that can be adapted across individuals and broad walking velocity fields. It consists of a multi-gait division algorithm, which can divide a full stride into push-off, swing, heel-strike, and stance based on multi-axis IMU data. Additionally, based on the acquired gait phases, the correlation between multiple features of

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Samadzadeh, Sara, Harald Hefter, Osman Tezayak, and Dietmar Rosenthal. "Mildly Impaired Foot Control in Long-Term Treated Patients with Wilson’s Disease." Journal of Functional Morphology and Kinesiology 7, no. 1 (2021): 5. http://dx.doi.org/10.3390/jfmk7010005.

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Abnormal gait is a common initial symptom of Wilson’s disease, which responds well to therapy, but has not been analyzed in detail so far. In a pilot study, a mild gait disturbance could be detected in long-term treated Wilson patients. The question still is what the underlying functional deficit of this gait disturbance is and how this functional deficit correlates with further clinical and laboratory findings. In 30 long-term treated Wilson patients, the vertical component of foot ground reaction forces (GRF-curves) was analyzed during free walking without aid at the preferred gait speed ove

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Vuong, Jo-Lâm, Antonia Edel, Paul Voß, and Alexander Ferrauti. "Effectiveness and Kinematic Analysis of Initial Step Patterns for Multidirectional Acceleration in Team and Racquet Sports." Journal of Human Kinetics 85, no. 1 (2022): 13–22. http://dx.doi.org/10.2478/hukin-2022-0106.

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Abstract The ability for quick multidirectional accelerations is crucial for athletic performance in team and racquet sports. So far, there has been little research dedicated to different initial step patterns usually applied by players. Therefore, the present study investigated the kinematic characteristics and effectiveness of the following step patterns: Jab Step (JS), Pivot Step (PS), Gravity Step (GS) and Counter Step (CS). Twenty-two male competitive team and racquet sport athletes completed maximum lateral accelerations utilizing the step patterns. Following familiarization with each st

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Bouffard, Vicky, Julie Nantel, Marc Therrien, Pascal-André Vendittoli, Martin Lavigne, and François Prince. "Center of Mass Compensation during Gait in Hip Arthroplasty Patients: Comparison between Large Diameter Head Total Hip Arthroplasty and Hip Resurfacing." Rehabilitation Research and Practice 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/586412.

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Objective. To compare center of mass (COM) compensation in the frontal and sagittal plane during gait in patients with large diameter head total hip arthroplasty (LDH-THA) and hip resurfacing (HR).Design. Observational study.Setting. Outpatient biomechanical laboratory.Participants. Two groups of 12 patients with LDH-THA and HR recruited from a larger randomized study and 11 healthy controls.Interventions. Not applicable.Main Outcome Measures. To compare the distance between the hip prosthetic joint center (HPJC) and the COM. The ratio (RHPJC-COM) and the variability (CVHPJC-COM) were compared

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Blanksby, Brian A., Jennifer R. Simpson, Bruce C. Elliott, and Keith McElroy. "Biomechanical Factors Influencing Breaststroke Turns by Age-Group Swimmers." Journal of Applied Biomechanics 14, no. 2 (1998): 180–89. http://dx.doi.org/10.1123/jab.14.2.180.

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Because turning can account for one-third of breaststroke race time in 25 m pools, it is possible that enhancing turning techniques can improve performance significantly. Underwater video cameras and a force platform were used to analyze turning techniques of 23 age-group breaststrokers during three 50 m push-start, maximum-effort swims. The criterion measure was the time elapsed between passing the 5 m mark on the approach and departure from the wall (5 m round-trip time [RTT]). Correlations revealed significant commonality of variance (p < .01) between the 5 m RTT and the 2.5 m RTT, 50 m

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van den Bosch, F., J. A. J. Metz, and J. C. Zadoks. "Pandemics of Focal Plant Disease, a Model." Phytopathology® 89, no. 6 (1999): 495–505. http://dx.doi.org/10.1094/phyto.1999.89.6.495.

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An analytical model of a pandemic, initiated by a single focus and spreading over a continent, is developed using foci as the smallest units of disease and fields as the smallest units of host. A few generalizing assumptions lead to a parameter-sparse model that may answer general questions on pandemics in a qualitative manner. For pandemic spread of disease during one season, a ‘within-season velocity of pandemic spread,’ C, is expressed as a set of integral equations. Reduction of inoculum during the off-season is expressed by a ‘survival ratio’ of inoculum, ε. The effect of the off-season i

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LWOGA, Noel Biseko, and Joshua MWANKUNDA. "COMPARING MOTIVATION AND PROFILE BETWEEN ARCHAEOTOURISTS AND NONARCHAEOTOURISTS IN NGORONGORO, TANZANIA." GeoJournal of Tourism and Geosites 32, no. 4 (2020): 1394–401. http://dx.doi.org/10.30892/gtg.32430-586.

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The study aims to compare motivation and profile between archaeotourists and non-archaeotourists. It utilizes the push and pull motivational model and distance decay theory, and questionnaire data from a sample of 252 international tourists visiting Ngorongoro Conservation Area (NCA) in Tanzania. The analysis revealed that archaeotourists are more heterogeneous than non-archaeotourists, as they not only attach importance to fascinating stories and the authenticity of past objects, but also to enjoying nature, the geological scenery, doing research on archaeological features and each other's co

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Lanzi, Stefano, Joël Boichat, Luca Calanca, Pauline Aubertin, Davide Malatesta, and Lucia Mazzolai. "Gait changes after supervised exercise training in patients with symptomatic lower extremity peripheral artery disease." Vascular Medicine 26, no. 3 (2021): 259–66. http://dx.doi.org/10.1177/1358863x20984831.

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This study aimed to investigate the effects of supervised exercise training (SET) on walking performance and spatiotemporal gait changes in patients with symptomatic lower extremity peripheral artery disease (PAD). In this single-arm prospective nonrandomized cohort study, patients with Fontaine stage II PAD following a 3-month SET program were included. Before and after SET, a constant-load treadmill test was performed to determine the pain-free and maximal walking distances (PFWD and MWD, respectively). During this test, spatiotemporal gait parameters were assessed. The ankle–brachial index

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14

Tai, Wei-Hsun, Ray-Hsien Tang, Chen-Fu Huang, Shin-Liang Lo, Yu-Chi Sung, and Hsien-Te Peng. "Acute Effects of Handheld Loading on Standing Broad Jump in Youth Athletes." International Journal of Environmental Research and Public Health 18, no. 9 (2021): 5046. http://dx.doi.org/10.3390/ijerph18095046.

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The study aimed to investigate the acute effects of handheld loading on standing broad jump (SBJ) performance and biomechanics. Fifteen youth male athletes (mean age: 14.7 ± 0.9 years; body mass: 59.3 ± 8.0 kg; height: 1.73 ± 0.07 m) volunteered to participate in the study. Participants were assigned to perform SBJ with and without 4 kg dumbbells in a random order. Kinematic and kinetic data were collected using 10 infrared high-speed motion-capture cameras at a 250 Hz sampling rate and two force platforms at a 1000 Hz sampling rate. A paired t-test was applied to all variables to determine th

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Przybyła, Mariusz. "Distance Learning – Unjustified Enthusiasm or the First Milestone?" Yearbook of Pedagogy 44, no. 1 (2021): 203–25. http://dx.doi.org/10.2478/rp-2021-0014.

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Summary Nowadays it is difficult to talk about the real and virtual world in the context of contemporary students. Perhaps even talking about „on-line” vs „off-line” is a thing of the past, since some of us are always online. Remote learning changes the approach to school and extracurricular education and affects all levels of education. An important aspect of considerations on school and academic e-learning is so called the bottom-up push, i.e. the involvement of enthusiasts discovering the secrets of e-learning platforms in front of their pupils and the willingness of these pupils and studen

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Channon, Anthony J., James R. Usherwood, Robin H. Crompton, Michael M. Günther, and Evie E. Vereecke. "The extraordinary athletic performance of leaping gibbons." Biology Letters 8, no. 1 (2011): 46–49. http://dx.doi.org/10.1098/rsbl.2011.0574.

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The distance that animals leap depends on their take-off angle and velocity. The velocity is generated solely by mechanical work during the push-off phase of standing-start leaps. Gibbons are capable of exceptional leaping performance, crossing gaps in the forest canopy exceeding 10 m, yet possess none of the adaptations possessed by specialist leapers synonymous with maximizing mechanical work. To understand this impressive performance, we recorded leaps of the gibbons exceeding 3.7 m. Gibbons perform more mass-specific work (35.4 J kg −1 ) than reported for any other species to date, acceler

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Miftakhutdinova, D. A., T. V. Voronkova, A. M. Laichuk, and D. S. Hranovskyi. "The effect of functional training on the explosive power of Greco-Roman wrestlers." Scientific Journal of National Pedagogical Dragomanov University. Series 15. Scientific and pedagogical problems of physical culture (physical culture and sports), no. 4(190) (April 25, 2025): 98–102. https://doi.org/10.31392/udu-nc.series15.2025.04(190).20.

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This study investigates the effects of functional training on the development of explosive power in Greco-Roman wrestlers. The research involved 20 male athletes aged 18–25, divided into two groups: an experimental group (EG) and a control group (CG). The EG followed an 8-week training program incorporating plyometric exercises, weightlifting exercises (snatch, clean & jerk, speed squats), and isometric holds, while the CG continued their standard training routine without a specific focus on explosive power development. Pre- and post-training assessments included the countermovement jump (

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Zając, Bartosz, Anna Mika, Paulina Katarzyna Gaj, and Tadeusz Ambroży. "Does Cycling Training Reduce Quality of Functional Movement Motor Patterns and Dynamic Postural Control in Adolescent Cyclists? A Pilot Study." International Journal of Environmental Research and Public Health 19, no. 19 (2022): 12109. http://dx.doi.org/10.3390/ijerph191912109.

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The aim of this study was to assess whether cycling training may influence quality of functional movement patterns and dynamic postural control. We also sought to determine if the Functional Movement Screen and Lower Quarter Y-balance tests could be predictive of injury risk among adolescent road cyclists. Twenty-three male road cyclists, aged 15–18 years, were involved in the study. Quality of functional movement patterns was assessed using the Functional Movement Screen test (FMS). Dynamic postural control was evaluated using the Lower Quarter Y-balance test (YBT-LQ). Information on injury o

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Mance, Davor. "Un-Vignetting vignettes." Pomorstvo 31, no. 1 (2017): 60–66. http://dx.doi.org/10.31217/p.31.1.8.

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In the art of photography, the phenomenon of vignetting means blurring of an image at its periphery compared to its centre. Vignettes are a form of road pricing independent of travel distance. Their usage in Croatia was recently rejected while in Europe, the number of countries using them, is increasing. The economic question of using vignettes as a primary source of revenue for the financing of Croatian highways was blurred by economically peripheral but politically sensitive welfare transfer issues. There has been no visible attempt to push the discussion back into the field of economics by

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Li, Dong-Chang, Chia-Chun Chen, Shien-Kuei Liaw, Shofuro Afifah, Jiun-Yu Sung, and Chien-Hung Yeh. "Performance Evaluation of Underwater Wireless Optical Communication System by Varying the Environmental Parameters." Photonics 8, no. 3 (2021): 74. http://dx.doi.org/10.3390/photonics8030074.

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Underwater wireless optical communication (UWOC) has been considered a promising technology for high-speed underwater transmission. Some Gb/s level UWOC systems applying visible light have been demonstrated with a transmission distance of several meters or more. Many of the previous works focus on the advanced technologies to push the systems’ capacity–distance performance. However, practical environmental factors issue such as flow turbulence and temperature variation are seldom studied through specific statistical/theoretical models. In this paper, a UWOC system using a 450 nm blue light las

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Bobet, Jacques, Suling Chong, Robert Rolf, and Richard Stein. "Walking with functional electrical stimulation and unlocking braces in thoracic-level paraplegia." Journal of Automatic Control 21, no. 1 (2013): 27–30. http://dx.doi.org/10.2298/jac1301027b.

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Walking was tested in 4 people with thoracic-level paraplegia using stimulation of quadriceps muscles, the flexor reflex and unlocking knee-ankle-foot orthoses (KAFO). Heart rate, speed, distance, kinematics and ground reaction forces were measured while subjects walked using a walker. None of the subjects could walk without the system; all could walk continuously for at least 4 minutes with it. Joint angles and some other kinematic features resembled normal walking, but the walking was too slow (average speed: 3.8 m/min.) and too demanding (heart rate: 128 b/min; physiological cost index: 15

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Mehmood, Adnan, Han He, Xiaochen Chen, et al. "ClothFace: A Passive RFID-Based Human-Technology Interface on a Shirtsleeve." Advances in Human-Computer Interaction 2020 (August 5, 2020): 1–8. http://dx.doi.org/10.1155/2020/8854042.

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This paper introduces ClothFace, a shirtsleeve-integrated human-technology interface platform, which comprises two wrist antennas and three radio frequency identification (RFID) integrated circuits (ICs), each with a unique ID. The platform prototype, which is created on a shirtsleeve by cutting the antennas and antenna-IC interconnections from copper tape, can be used for push button and swipe controlling. Each IC can be activated, i.e., electrically connected to the two antennas, by touching the IC. These ICs can act as wireless input buttons to the technology around us. Due to the used pass

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Barkwell, Gordon E., and James P. Dickey. "Different Lower-Limb Setup Positions Do Not Consistently Change Backstroke Start Time to 10 m." Sports 8, no. 4 (2020): 43. http://dx.doi.org/10.3390/sports8040043.

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Backstroke starts involve the athlete starting from a flexed position with their feet against the pool wall and then extending their ankles, knees, hips and back to push off; however, swimmers can start in different positions. The purpose of this study was to evaluate the performance impact of different knee extension angles in the setup position for a backstroke start. Ten backstroke swimmers completed maximum-effort starts in each of two setup positions: one with the knees maximally flexed, and one with the knees less flexed. The start handles and touchpad were instrumented with multi-axial

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Cui, X., and J. M. N. T. Gray. "Gravity-driven granular free-surface flow around a circular cylinder." Journal of Fluid Mechanics 720 (February 27, 2013): 314–37. http://dx.doi.org/10.1017/jfm.2013.42.

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AbstractSnow avalanches and other hazardous geophysical granular flows, such as debris flows, lahars and pyroclastic flows, often impact on obstacles as they flow down a slope, generating rapid changes in the flow height and velocity in their vicinity. It is important to understand how a granular material flows around such obstacles to improve the design of deflecting and catching dams, and to correctly interpret field observations. In this paper small-scale experiments and numerical simulations are used to investigate the supercritical gravity-driven free-surface flow of a granular avalanche

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Rudnik, Daria, Pedro Fonseca, Susana Soares, et al. "Selected Antropometric Characteristic of Swimmers vs. Kinematics of the Swimming Start." Polish Hyperbaric Research 88, no. 3 (2024): 25–44. https://doi.org/10.2478/phr-2024-0014.

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Abstract We researched for relationships between selected anthropometric parameters of the elite swimmers and their performance considering the biomechanical structure of the swimming start as well as preferred back plate position. The study group consisted of 13 female and 14 male swimmers. First, anthropometric measures were obtained with a 3D scanner (Mephisto EX-PRO, 4D Dynamics Bvba, Belg). Subsequently, participants performed a kickstart. An instrumented starting block and four video cameras were used to collect kinematic data of the starts. The footage was analyzed using SIMI Motion sof

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Sarkar, Dr Amit Kumar. "Kinetic and Kinematic Analysis of Locomotion Speed of Higher Secondary Boys." ENSEMBLE 2, no. 2 (2021): 324–31. http://dx.doi.org/10.37948/ensemble-2021-0202-a034.

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The purpose was to analyze selected components of locomotion speed. Thirty school boys of age ranging from 17 to 19 year were selected as subject. Selected anthropometric and mechanical parameters were body weight, body height, leg length, maximum locomotion speed, leg power, stride length, stride frequency, body inclination, angle of leg placement in braking phase, push-off angle, horizontal projection of CG in braking phase, horizontal projection of CG in propulsion phase, horizontal velocity of CG in braking phase, horizontal velocity of CG in propulsion phase, velocity of swing leg in brak

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Yoo, Kyoung-Seok, Hyun-Kyung Kim, and Jin-Hoon Park. "A Biomechanical Assessment of the Sliding Motion of Curling Delivery in Elite and Subelite Curlers." Journal of Applied Biomechanics 28, no. 6 (2012): 694–700. http://dx.doi.org/10.1123/jab.28.6.694.

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The present study examined the technical characteristics of sliding performance from push-off until stone release in curling delivery. Five elite performance level curlers (> 7 years experience) and five subelite level curlers (< 3 years experience) were analyzed during the action of delivery of a curling stone. The joint angles, angular velocities, and moments of the body center of mass (COM) were determined based on three-dimensional kinematic data. The plantar pressure data were measured using a validated in-shoe system. The results indicated that the gliding time and horizontal veloc

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Chainok, Phornpot, Leandro Machado, Karla de Jesus, et al. "Backstroke to Breaststroke Turning Performance in Age-Group Swimmers: Hydrodynamic Characteristics and Pull-Out Strategy." International Journal of Environmental Research and Public Health 18, no. 4 (2021): 1858. http://dx.doi.org/10.3390/ijerph18041858.

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We compared the hydrodynamic characteristics and pull-out strategies of four backstroke-to-breaststroke turning techniques in young swimmers. Eighteen 11 and 12-year-old swimmers participated in a 4 week intervention program including 16 contextual interference sessions. The hydrodynamic variables were assessed through inverse dynamics, and the pull-out strategy kinematics were assessed with tracking markers followed by 12 land cameras and 11 underwater cameras. Swimmers randomly completed sixteen 30 m maximal backstroke-to breaststroke-open, somersault, bucket and crossover turns (four in eac

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Revathy, A., C. S. Boopathi, Osamah Ibrahim Khalaf та Carlos Andrés Tavera Romero. "Investigation of AlGaN Channel HEMTs on β-Ga2O3 Substrate for High-Power Electronics". Electronics 11, № 2 (2022): 225. http://dx.doi.org/10.3390/electronics11020225.

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The wider bandgap AlGaN (Eg > 3.4 eV) channel-based high electron mobility transistors (HEMTs) are more effective for high voltage operation. High critical electric field and high saturation velocity are the major advantages of AlGaN channel HEMTs, which push the power electronics to a greater operating regime. In this article, we present the DC characteristics of 0.8 µm gate length (LG) and 1 µm gate-drain distance (LGD) AlGaN channel-based high electron mobility transistors (HEMTs) on ultra-wide bandgap β-Ga2O3 Substrate. The β-Ga2O3 substrate is cost-effective, available in large wafer s

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Borghi, Corrado, Silvia Sassi, Daniela Pandarese, Samuele Messori, and Silvia Faccioli. "Effect of Ankle-Foot Orthoses in Pediatric Patients with Hereditary Motor-Sensory Neuropathy: A Case Series Study." Children 10, no. 9 (2023): 1529. http://dx.doi.org/10.3390/children10091529.

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(1) Aims: to evaluate the effect on gait performance and standing stability of ankle-foot orthoses (AFO) in pediatric patients with hereditary motor-sensory neuropathy (HMSN). (2) Methods: a retrospective case-series study including three adolescents (S1, S2, S3, mean age 14 years) with HMSN. The subjects were evaluated barefoot, with carbon AFO (Botter) and with solid AFO (SAFO) by means of: gait analysis, stabilometry and gait functional tests (10 Meter Walk Test, 2 Minute Walk Test). Finally, the CSD-OPUS questionnaire was administered to the assess satisfaction and impact of the orthoses o

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Liu, Dongyao, Chao Gao, Fusheng Zhou, Miaomiao Chen, Heng Zhao, and Hao Yang. "Simulation Study on Dynamic Characteristics of Bubbles in Transformer Oil under Extremely Nonuniform Field." Journal of Physics: Conference Series 2557, no. 1 (2023): 012070. http://dx.doi.org/10.1088/1742-6596/2557/1/012070.

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Abstract Bubbles in transformer oil seriously threaten the deterioration of internal insulation performance during its movement, leading to severe transformer failure. A gas-liquid two-phase flow simulation model is established based on the phase field method to study the effect of bubbles on the insulation performance of transformer oil. The dynamic characteristics of bubbles in transformer oil under extremely non-uniform electric fields are studied. The results show that the electric field force has a pushing effect on the bubble. As the voltage increases, the pushing effect is more signific

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Matias, Alessandra B., Paolo Caravaggi, Ulisses T. Taddei, Alberto Leardini, and Isabel C. N. Sacco. "Rearfoot, Midfoot, and Forefoot Motion in Naturally Forefoot and Rearfoot Strike Runners during Treadmill Running." Applied Sciences 10, no. 21 (2020): 7811. http://dx.doi.org/10.3390/app10217811.

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Different location and incidence of lower extremity injuries have been reported in rearfoot strike (RFS) and forefoot strike (FFS) recreational runners. These might be related to functional differences between the two footstrike patterns affecting foot kinematics and thus the incidence of running injuries. The aim of this study was to investigate and compare the kinematic patterns of foot joints between naturally RFS and FFS runners. A validated multi-segment foot model was used to measure 24 foot kinematic variables in long-distance recreational runners while running on a treadmill. These var

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Lee, Ming-Yih, Chih-Feng Lin, and Kok-Soon Soon. "Balance control enhancement using sub-sensory stimulation and visual-auditory biofeedback strategies for amputee subjects." Prosthetics and Orthotics International 31, no. 4 (2007): 342–52. http://dx.doi.org/10.1080/03093640601058162.

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Sub-sensory electrical or mechanical stimulation can enhance the sensitivity of the human somatosensory system to improve the balance control capabilities of elderly. In addition, clinical studies suggest that visual-auditory biofeedback can improve sensory compensation for the elderly. This study hypothesizes that the static balance and gait performance of single leg quiet standing and treadmill walking could be improved for providing proprioceptive neuromuscular facilitation using sub-sensory stimulation and visual-auditory biofeedback in amputee subjects. To test this, a computerized foot p

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Budiyanta, Ari Sugeng, Fuad Surastyo Pranoto, Andreas Prasetya Adi, and Agus Wiyono. "Design and Testing of a Bungee Cord Based Launcher for LSU-02 UAV." Majalah Ilmiah Pengkajian Industri 16, no. 3 (2022): 114–20. http://dx.doi.org/10.29122/mipi.v16i3.5518.

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The LSU-02 is one of the unmanned aerial vehicles (UAVs) developed by LAPAN (now BRIN). It has a good endurance and flight range, i.e., it can fly for four hours and up to 200 km. However, the UAV needs a good and long runway to do the takeoff and landing operations. In real missions, sometimes it is hard to find the proper runway. Therefore, a method for taking-off without a runway, namely using a launcher, is required. The two most frequently used launcher systems are pneumatic launcher and bungee cord launcher. However, based on our experience using the launcher for LSU-03 UAV, a pneumatic

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Rongting Zhao. "Research on the Method of Cultivating Water Sense of Swimming Beginners in Colleges and Universities -- A Case Study of Students in Nanjing Sport Institute." Journal of Electrical Systems 20, no. 11s (2024): 1881–90. https://doi.org/10.52783/jes.7661.

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Aim：Through a 12-week water sense training for swimming beginners in Nanjing Institute of Physical Education, this paper probes into the training methods of water sense, with the aim of deepen students’ empathetic of water, so as to make swimming teaching better and deeper. Method: In this paper, by means of the methods of literature, experiment, questionnaire, mathematical statistics and other research methods, 20 swimming beginners in Nanjing Institute of Physical Education were randomly divided into the control group and the experimental group by drawing lots for a 12-week controlled test T

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Downs Talmage, Jessica, Jessica Gilliam, Ajit Chardhari, and Gretchen D. Oliver. "Differences in Lower Extremity Kinematics Between Collegiate and Youth Softball Pitchers." Orthopaedic Journal of Sports Medicine 9, no. 11 (2021): 232596712110520. http://dx.doi.org/10.1177/23259671211052022.

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Background: Softball pitching is a whole-body motion that utilizes the kinetic chain to transfer the large amounts of force generated by the lower extremity to the ball. Although the lower extremity is responsible for generating most of the force in softball pitching, limited research has investigated how lower extremity kinematics vary with age. Purpose/Hypothesis: The purpose of this study was to compare lower extremity kinematics between collegiate and youth softball pitchers. It was hypothesized that there would be significant lower extremity kinematic differences between age groups. Study

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Fischer, D., H. Sahling, K. Nöthen, G. Bohrmann, M. Zabel, and S. Kasten. "Interaction between hydrocarbon seepage, chemosynthetic communities and bottom water redox at cold seeps of the Makran accretionary prism: insights from habitat-specific pore water sampling and modeling." Biogeosciences Discussions 8, no. 5 (2011): 9763–811. http://dx.doi.org/10.5194/bgd-8-9763-2011.

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Abstract. The interaction between fluid seepage, bottom water redox, and chemosynthetic communities was studied at cold seeps across one of the world's largest oxygen minimum zones (OMZ) located at the Makran convergent continental margin. Push cores were obtained from seeps within and at the lower boundary of the core-OMZ with a remotely operated vehicle. Extracted pore water was analyzed for sulfide and sulfate contents. Depending on oxygen availability, seeps were either colonized by microbial mats or by mats and macrofauna. The latter, including ampharetid polychaetes and vesicomyid clams,

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Fischer, D., H. Sahling, K. Nöthen, G. Bohrmann, M. Zabel, and S. Kasten. "Interaction between hydrocarbon seepage, chemosynthetic communities, and bottom water redox at cold seeps of the Makran accretionary prism: insights from habitat-specific pore water sampling and modeling." Biogeosciences 9, no. 6 (2012): 2013–31. http://dx.doi.org/10.5194/bg-9-2013-2012.

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Abstract. The interaction between fluid seepage, bottom water redox, and chemosynthetic communities was studied at cold seeps across one of the world's largest oxygen minimum zones (OMZ) located at the Makran convergent continental margin. Push cores were obtained from seeps within and below the core-OMZ with a remotely operated vehicle. Extracted sediment pore water was analyzed for sulfide and sulfate concentrations. Depending on oxygen availability in the bottom water, seeps were either colonized by microbial mats or by mats and macrofauna. The latter, including ampharetid polychaetes and v

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GUO, LAN-YUEN, FONG-CHIN SU, CHICH-HAUNG YANG, et al. "EFFECTS OF SPEED AND INCLINE ON LOWER EXTREMITY KINEMATICS DURING TREADMILL JOGGING IN HEALTHY SUBJECTS." Biomedical Engineering: Applications, Basis and Communications 18, no. 02 (2006): 73–79. http://dx.doi.org/10.4015/s1016237206000142.

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Recently, there are more people jogging with a treadmill at the gym or the home setting. The main available selected modes for treadmill jogging are speed and slope of incline. Increased speeds and incline slopes will not only increase the cardiopulmonary loading but may also alter the lower extremity (LE) movement patterns. There are few systematic investigations of the effect of the speed and incline on LE kinematics. Most studies have used 2D methods which focused on movements in sagittal plane only and this has limitations in the acquired data since lower extremity movements also include f

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Kumar, Anita J., Rachel Murphy-Banks, Ruth Ann Weidner, and Susan K. Parsons. "Late Effects Are Important Considerations in Initial Hodgkin Lymphoma Treatment Decision-Making According to Survivors." Blood 134, Supplement_1 (2019): 2137. http://dx.doi.org/10.1182/blood-2019-124481.

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Introduction The treatment landscape of Hodgkin Lymphoma (HL) has undergone a revolution in recent years, providing multiple options for providers and patients in their shared goal for disease control. However, these successful treatment options (e.g. multi-agent chemotherapy, radiotherapy, or combined modality) come at a high cost in the form of late effects, with little known about long-term toxicity of novel agents (e.g., Brentuximab vedotin, immunotherapy). As part of an international effort to develop tools to enhance treatment decision-making for providers and patients, we developed a su

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Abid, Idriss, Jash Mehta, Yvon Cordier, et al. "AlGaN Channel High Electron Mobility Transistors with Regrown Ohmic Contacts." Electronics 10, no. 6 (2021): 635. http://dx.doi.org/10.3390/electronics10060635.

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High power electronics using wide bandgap materials are maturing rapidly, and significant market growth is expected in a near future. Ultra wide bandgap materials, which have an even larger bandgap than GaN (3.4 eV), represent an attractive choice of materials to further push the performance limits of power devices. In this work, we report on the fabrication of AlN/AlGaN/AlN high-electron mobility transistors (HEMTs) using 50% Al-content on the AlGaN channel, which has a much wider bandgap than the commonly used GaN channel. The structure was grown by metalorganic chemical vapor deposition (MO

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Inklebarger, James, Gonzalez DL, Galanis Nikiforos, et al. "A Guide to Performing Seated, Foot-On-Floor Position Ultrasound Guided Knee Injections Targeting the Medial & Lateral Parapatellar Bursae & Their Channels." International Journal of Medical Science and Clinical Invention 9, no. 01 (2022): 5931–44. http://dx.doi.org/10.18535/ijmsci/v9i01.08.

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Ultrasound guided (USG) supra patellarbursa (SPB)knee aspirations-injections are a current standard practice, typically performed with the patient supine on a plinth, and with the knee flexedto around 30 degrees. This follows research that 30 degrees of knee flexion offers optimal SPB bursal resolution. However,in circumstances of pain-mobility issues affecting plinth transfer, an alternative seated, foot on floor or wheelchair pedal, knee-flexed 90 degrees procedure (SKIF)is proposed. This foot on floor position may facilitate a push-off counter resistance, facilitatingisometric quadriceps co

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Saunders, John. "Editorial." International Sports Studies 42, no. 1 (2020): 1–5. http://dx.doi.org/10.30819/iss.42-1.01.

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Covid 19 – living the experience As I sit at my desk at home in suburban Brisbane, following the dictates on self-isolation shared with so many around the world, I am forced to contemplate the limits of human prediction. I look out on a world which few could have predicted six months ago. My thoughts at that time were all about 2020 as a metaphor for perfect vision and a plea for it to herald a new period of clarity which would arm us in resolving the whole host of false divisions that surrounded us. False, because so many appear to be generated by the use of polarised labelling strategies whi

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Corman, Lauren, Jo-Anne McArthur, and Jackson Tait. "Electric Animal An Interview with Akira Mizuta Lippit & (untitled photographs)." UnderCurrents: Journal of Critical Environmental Studies 17 (November 16, 2013): 20–22. http://dx.doi.org/10.25071/2292-4736/37679.

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Dr. Akira Mizuta Lippit, author of Electric Animal: Toward a Rhetoric of Wildlife, explores, in the context of the development of cinema, how the concept of “the animal” has become central to modern understandings of human subjectivity. Lippit considers the disappearance of real animals and their concurrent appearance in various conceptual and material uses, particularly noting the ways in which the conjoined notions of humanity and animality figure into and through cinema. The animal, he argues, haunts the foundation of western logical systems. Yet, despite the fact that humans and animals su

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Chainok, Phornpot, Karla de Jesus, Luis Mourão, et al. "Biomechanical Features of Backstroke to Breaststroke Transition Techniques in Age-Group Swimmers." Frontiers in Sports and Active Living 4 (March 10, 2022). http://dx.doi.org/10.3389/fspor.2022.802967.

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This study aimed to identify the biomechanical features of backstroke to breaststroke transition techniques (open, somersault, bucket, and crossover) in age-group swimmers. Eighteen preadolescent swimmers (12.2 ± 0.4 years old and 3–4 Tanner stages) underwent 4 weeks of systematic contextual interference training, comprising 16 sessions (40 min·session−1). Soon after, experimental testing was conducted where swimmers randomly performed 12 × 15 m maximal turns (composed of 7.5 m turn-in and 7.5 m turn-out of the wall segments), three in each transition technique. Kinematical, kinetic, and hydro

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Girard, Olivier, Grégoire P. Millet, and Jean-Paul Micallef. "Constant low-to-moderate mechanical asymmetries during 800-m track running." Frontiers in Sports and Active Living 6 (January 19, 2024). http://dx.doi.org/10.3389/fspor.2024.1278454.

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IntroductionModifications in asymmetry in response to self-paced efforts have not been thoroughly documented, particularly regarding horizontally-derived ground reaction force variables. We determined the magnitude and range of gait asymmetries during 800 m track running.MethodsEighteen physical education students completed an 800 m self-paced run on a 200 m indoor track. During the run, vertical and horizontal ground reaction forces were measured at a sampling frequency of 500 Hz using a 5 m-long force platform system, with data collected once per lap. The following mechanical variables were

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Stefano, Elli, D’amata Dario, Cavalli Silvia, et al. "Impact of distance of the catheter tip from cavo-atrial junction on bubble test (delay) time: A prospective study." Journal of Vascular Access, February 10, 2023, 112972982311535. http://dx.doi.org/10.1177/11297298231153517.

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Introduction: Correct tip positioning is a critical aspect in central vascular access devices insertion. The verification of positioning at the cavo-atrial junction is usually performed by intracavitary electrocardiography. Recently, echocardiographic techniques were proposed, including the direct visualization of the catheter or the visualization of a saline/air bolus (i.e. “bubble test”). As for the latter, a push-to-bubbles delay time below 2 s was proposed to indicate a correct positioning of the catheter tip. The aim of this study was to measure the variations of the push-to-bubbles time

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Pommerell, Félicie, Sébastien Boyas, Pierre Samozino, et al. "How Does Push-Off Distance Influence Force–Velocity Profile and Performance During Vertical Jumping?" Journal of Applied Biomechanics, 2025, 1–6. https://doi.org/10.1123/jab.2024-0194.

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In many sports, practitioners must reach their maximal jump height (hmax) under time constraints. This requires a reduction of the countermovement depth and so of the push-off distance (hPO). The purpose of this study was to investigate how hPO influences force–velocity (F–v) profiles (, , , and SFv) and performance. Eleven participants (age: 26 [5] y, height: 175.6 [11.2] cm, mass: 76 [15] kg; squat 1RM: 129 [34] kg) performed maximal countermovement jumps. Kinetic and kinematic measurements were used to assess individual F–v profiles for 3 different hPO conditions (hPO-SMALL, hPO-MEDIUM, hPO

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Faelli, Emanuela, Laura Strassera, Sara Ottobrini, et al. "Not Breathing During the Approach Phase Ameliorates Freestyle Turn Performance in Prepubertal Swimmers." Frontiers in Sports and Active Living 3 (October 5, 2021). http://dx.doi.org/10.3389/fspor.2021.731953.

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This study compared the effects of two breathing conditions during the freestyle turn approach phase in swimmers. Thirty-four prepubertal swimmers (mean ± SD: 10.59 ± 0.97 years) were divided into two groups: No Breath (NB), not breathing at the last stroke, and Breath Stroke (BS). Swimmers performed three turns with 5 min of rest between the repetitions. Kinematic parameters were recorded with two underwater and two surface cameras. Total turn time (NB: 9.31 ± 1.34 s; BS: 10.31 ± 1.80 s; p = 0.049), swim-in time (NB: 3.89 ± 0.63 s; BS 4.50 ± 0.79 s; p = 0.02) and rotation time (NB: 2.42 ± 0.2

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Faelli, Emanuela, Laura Strassera, Sara Ottobrini, et al. "Not Breathing During the Approach Phase Ameliorates Freestyle Turn Performance in Prepubertal Swimmers." Frontiers in Sports and Active Living 3 (October 5, 2021). http://dx.doi.org/10.3389/fspor.2021.731953.

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This study compared the effects of two breathing conditions during the freestyle turn approach phase in swimmers. Thirty-four prepubertal swimmers (mean ± SD: 10.59 ± 0.97 years) were divided into two groups: No Breath (NB), not breathing at the last stroke, and Breath Stroke (BS). Swimmers performed three turns with 5 min of rest between the repetitions. Kinematic parameters were recorded with two underwater and two surface cameras. Total turn time (NB: 9.31 ± 1.34 s; BS: 10.31 ± 1.80 s; p = 0.049), swim-in time (NB: 3.89 ± 0.63 s; BS 4.50 ± 0.79 s; p = 0.02) and rotation time (NB: 2.42 ± 0.2

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