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Journal articles on the topic 'Leg Weight lifting Electromyography'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Zhu, Min, Xiao Lai Li, and Qiang Zhang. "Using Surface Electromyography to Analyze the Assistive Force Produced by Wearable Assistive Robot." Applied Mechanics and Materials 152-154 (January 2012): 1634–38. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.1634.

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This paper proposed a method for using the integration of surface electromyography (iSEMG) signals to compute the assistive force produced by wearable assistive robot (WAR). A study was conducted to analyze a subject during lifting his leg tied with different weights. The iSEMG of vastus lateralis (VL) muscle was computed. Then the linear correlation between muscle force and iSEMG was obtained. Finally, the assistive force produced by WAR could be computed by the linear correlation with iSEMG. We find that the effect of assistive force produced by WAR can be clearly analyzed by iSEMG.

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Lee, Yung-Hui, Chin-Yang Huwang, and Yang-Hwei Tsuang. "Biomechanical Characteristics of Preactivation and Pulling Phases of Snatch Lift." Journal of Applied Biomechanics 11, no. 3 (1995): 288–98. http://dx.doi.org/10.1123/jab.11.3.288.

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The biomechanical characteristics of 13 snatch lifts performed by 4 elite athletes were analyzed. Electromyographic data, ground reaction force index (GRFI), knee angular velocities, barbell velocities, and lifting time were obtained 0.2 s before the lift, for the first pulling phase (FP), and for the second pulling phase (SP). The preactivation, normalized electromyographic values correlated negatively with GRFI (p < .01). In the FP and SP, all of the parameters correlated positively with each other except lifting time. GRFI in the FP also correlated positively with GRFI, maximum knee angu

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van den Tillaar, Roland, and Stian Larsen. "Kinematic and EMG Comparison Between Variations of Unilateral Squats Under Different Stabilities." Sports Medicine International Open 4, no. 02 (2020): E59—E66. http://dx.doi.org/10.1055/a-1195-1039.

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AbstractThe purpose of the study was to compare kinematics and muscle activity between two variations of unilateral squats under different stability conditions. Twelve male volunteers (age: 23±5 years, mass: 80±17 kg, height: 1.81±0.11 m, strength-training experience: 4.3±1.9 years) performed four repetitions with the same external load (≈4RM). Two variations (with the non-stance leg forwards vs. backwards) were performed in a Smith-machine and free-weight condition. The variables were barbell velocity, lifting time and surface electromyography activity of the lower extremity and trunk muscles

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Kingma, Idsart, Gert S. Faber, Anja JM Bakker, and Jaap H. van Dieën. "Can Low Back Loading During Lifting Be Reduced by Placing One Leg Beside the Object to Be Lifted?" Physical Therapy 86, no. 8 (2006): 1091–105. http://dx.doi.org/10.1093/ptj/86.8.1091.

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Abstract Background and Purpose. Lifting technique could, through its effect on low back loading, affect the risk of developing low back pain. In this study, 2 lifting techniques (a straddle technique and a 1-leg kneeling technique), which aimed to reduce low back loading by placing one leg beside a load, were compared with stoop lifting and squat lifting with respect to their effect on low back loading. Subjects. Twelve men with no history of low back pain participated in the study. Methods. The subjects lifted wide and narrow 20-kg boxes from 2 initial hand heights. With measured kinematics,

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Cheng, Te-Shiang, and Tzu-Hsien Lee. "Maximum Acceptable Weight of Lift for Asymmetric Lifting." Perceptual and Motor Skills 96, no. 3_suppl (2003): 1339–46. http://dx.doi.org/10.2466/pms.2003.96.3c.1339.

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10 undergraduate men were tested to determine the effects of lifting mode and frequency on psychophysically established maximum acceptable weight of lift for 4 hr. of work. The heart rate and rate of perceived exertion (RPE) of the individuals while lifting the maximum acceptable weight of lift were measured. When performing a 90° asymmetric lifting, subjects lifted approximately 10% less weight than lifted in symmetric lifting. Nonsignificant differences in maximum acceptable weight of lift, heart rate, and RPE values were found between asymmetric lifting with trunk rotation and asymmetric li

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CHEN, SHEN-KAI, MING-TUNG WU, CHUN-HAO HUANG, JIA-HROUNG WU, LAN-YUEN GUO, and WEN-LAN WU. "THE ANALYSIS OF UPPER LIMB MOVEMENT AND EMG ACTIVATION DURING THE SNATCH UNDER VARIOUS LOADING CONDITIONS." Journal of Mechanics in Medicine and Biology 13, no. 01 (2013): 1350010. http://dx.doi.org/10.1142/s0219519413500103.

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This study investigates upper limb movement and electromyography (EMG) signals during snatch under various loading conditions and discusses results from six lifting phases. Qualisys motion analysis and Noraxon EMG systems were used to record upper limb movement and muscle activity. When lifting heavy weights, the maximum shoulder flexion angle exceeded 180° in the rise phase and thus, was higher than when lifting lower weight categories. The deltoid and biceps muscles exhibited higher activity during this phase when lifting heavy weights. It can be inferred that the deltoid muscle is activated

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7

Wong, T. S., and F. W. Booth. "Skeletal muscle enlargement with weight-lifting exercise by rats." Journal of Applied Physiology 65, no. 2 (1988): 950–54. http://dx.doi.org/10.1152/jappl.1988.65.2.950.

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A rat model of weight lifting that produces skeletal muscle enlargement utilizing regimens of resistance training similar to those employed in human training programs is described. The model consists of electrically stimulating the lower leg muscles to contract against a weighted pulley bar. Animals were subjected to training protocols employing low-frequency repetitions with high training loads within a training session. Initial maximum loads of between 200 and 800 g were progressively increased during the 16 wk of training. Work done at the end of the training period increased to an average

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Lane, Charity L., Dustin Hardwick, Thomas P. Janus, Henian Chen, Yuanyuan Lu, and John M. Mayer. "Comparison of the firefighter candidate physical ability test to weight lifting exercises using electromyography." Work 62, no. 3 (2019): 459–67. http://dx.doi.org/10.3233/wor-192880.

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9

McCartney, N., R. S. McKelvie, J. Martin, D. G. Sale, and J. D. MacDougall. "Weight-training-induced attenuation of the circulatory response of older males to weight lifting." Journal of Applied Physiology 74, no. 3 (1993): 1056–60. http://dx.doi.org/10.1152/jappl.1993.74.3.1056.

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We examined the effects of 12 wk of dynamic strength training on the heart rate (HR) and blood pressure of older male subjects during 10 repetitions of single-arm curl and single- and double-leg press at 60 and 80% of both the pre- and posttraining maximum capacities and during single maximum lifts (1 RM). The circulatory responses were greater at 80% of 1 RM than at 60% and increased with active muscle mass. After training, the 1 RMs increased by 24 (legs) to 54% (arms) and there was a marked attenuation of HR and arterial pressure during exercise when subjects lifted the same absolute load.

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10

Perez-Gomez, Jorge, Hugo Olmedillas, Safira Delgado-Guerra, et al. "Effects of weight lifting training combined with plyometric exercises on physical fitness, body composition, and knee extension velocity during kicking in football." Applied Physiology, Nutrition, and Metabolism 33, no. 3 (2008): 501–10. http://dx.doi.org/10.1139/h08-026.

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The effects of a training program consisting of weight lifting combined with plyometric exercises on kicking performance, myosin heavy-chain composition (vastus lateralis), physical fitness, and body composition (using dual-energy X-ray absorptiometry (DXA)) was examined in 37 male physical education students divided randomly into a training group (TG: 16 subjects) and a control group (CG: 21 subjects). The TG followed 6 weeks of combined weight lifting and plyometric exercises. In all subjects, tests were performed to measure their maximal angular speed of the knee during instep kicks on a st

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Sale, Digby G., Dianne E. Moroz, Robert S. McKelvie, J. Duncan MacDougall, and Neil McCartney. "Effect of Training on the Blood Pressure Response to Weight Lifting." Canadian Journal of Applied Physiology 19, no. 1 (1994): 60–74. http://dx.doi.org/10.1139/h94-004.

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Six young men weight trained 3 days∙week−1 for 19 weeks, on each day doing 3 warm-up sets of 20 repetitions followed by 1 set each at 15-20, 10-15, and 7-10 RM (Day 1), 3 sets at 15-20 RM (Day 2), and 1 set at 15-20 and 2 sets at 10-15 RM (Day 3) of a seated bilateral leg press exercise. Training increased (P < 0.05) the maximal single leg press lift (1-RM, 26%) and knee extensor cross-sectional area (12%). Arterial (brachial artery catheter) and esophageal (probe) pressure responses were measured before and after training as subjects did sets of as many repetitions as possible up to 20 rep

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Ren, Xiao Li, Xue Mei Shang, Chen Fan, and Yan Ting Du. "A Design of Electric Hydraulic Lifting Device Supported by Mechanical Structure." Key Engineering Materials 621 (August 2014): 317–22. http://dx.doi.org/10.4028/www.scientific.net/kem.621.317.

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In hydraulic transmission, Hydraulic pressure can not support heavy objects long time. For the shortcoming, an electro-hydraulic lifting device is designed with mechanical structural supporting; Electric motor is the motive power. The weight is lifted by hydraulic transmission technology; the base of the device is set up a lifting rigid leg and pushing forward Casters .After hydraulic system lifting heavy objects, the lifting devices rely on the support tube, mechanical positioning tube and rigid supporting legs to lock the lifting position. In order to ensure the same high of support on diffe

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Poitras, Isabelle, Mathieu Bielmann, Alexandre Campeau-Lecours, Catherine Mercier, Laurent J. Bouyer, and Jean-Sébastien Roy. "Validity of Wearable Sensors at the Shoulder Joint: Combining Wireless Electromyography Sensors and Inertial Measurement Units to Perform Physical Workplace Assessments." Sensors 19, no. 8 (2019): 1885. http://dx.doi.org/10.3390/s19081885.

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Background: Workplace adaptation is the preferred method of intervention to diminish risk factors associated with the development of work-related shoulder disorders. However, the majority of the workplace assessments performed are subjective (e.g., questionnaires). Quantitative assessments are required to support workplace adaptations. The aims of this study are to assess the concurrent validity of inertial measurement units (IMUs; MVN, Xsens) in comparison to a motion capture system (Vicon) during lifting tasks, and establish the discriminative validity of a wireless electromyography (EMG) sy

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Lavender, Steven A., Sang-Hsiung Chen, Yi-Chun Li, and Gunnar B. J. Andersson. "Pulling on Slippery versus Non-Slippery Surfaces: Can a Lifting Belt Help?" Proceedings of the Human Factors and Ergonomics Society Annual Meeting 40, no. 13 (1996): 604–8. http://dx.doi.org/10.1177/154193129604001305.

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Biomechanical research has shown that pull forces are largely generated by leg extension and by leaning (using one's body mass). However, this pulling technique requires sufficient friction in the foot floor interface. When pulling tasks are performed on slippery surfaces the center of gravity must be kept over the feet, thereby increasing the trunk's role in force generation. The purpose of this study was to investigate using electromyography (EMG) the muscle recruitments in the torso when pulling tasks are performed on slippery versus non-slippery surfaces. It was hypothesized that if a lift

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Phillips, Shane A., Emon Das, Jingli Wang, Kirkwood Pritchard, and David D. Gutterman. "Resistance and aerobic exercise protects against acute endothelial impairment induced by a single exposure to hypertension during exertion." Journal of Applied Physiology 110, no. 4 (2011): 1013–20. http://dx.doi.org/10.1152/japplphysiol.00438.2010.

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Resistance and aerobic exercise is recommended for cardiovascular health and disease prevention. However, the accompanying increase in arterial pressure during resistance exercise may be detrimental to vascular health. This study tests the vascular benefits of aerobic compared with resistance exercise on preventing impaired vascular function induced by a single weight lifting session that is associated with acute hypertension. Healthy, lean sedentary (SED) subjects, weight lifters, runners (>15 miles/wk), and cross trainers (chronic aerobic and resistance exercisers), underwent a single pro

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Brown, A. B., N. McCartney, and D. G. Sale. "Positive adaptations to weight-lifting training in the elderly." Journal of Applied Physiology 69, no. 5 (1990): 1725–33. http://dx.doi.org/10.1152/jappl.1990.69.5.1725.

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Maximal weight-lifting performance, isometric strength, isokinetic torque, whole muscle and individual fiber cross-sectional areas, and muscle evoked contractile properties were assessed in 14 elderly males before and after 12 wk of weight-lifting training. Dynamic elbow flexion training of one arm resulted in a significant 48% mean increase in the maximal load that could be lifted once (1 RM) and a smaller improvement in isokinetic torque (8.8%) but no change in isometric strength. In the contralateral control arm, 1 RM and isokinetic torque increased by 12.7 and 6.5%, respectively, but isome

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Jensen, Bente R., Line Hovgaard-Hansen, and Katrine L. Cappelen. "Muscle Activation and Estimated Relative Joint Force During Running with Weight Support on a Lower-Body Positive-Pressure Treadmill." Journal of Applied Biomechanics 32, no. 4 (2016): 335–41. http://dx.doi.org/10.1123/jab.2015-0075.

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Running on a lower-body positive-pressure (LBPP) treadmill allows effects of weight support on leg muscle activation to be assessed systematically, and has the potential to facilitate rehabilitation and prevent overloading. The aim was to study the effect of running with weight support on leg muscle activation and to estimate relative knee and ankle joint forces. Runners performed 6-min running sessions at 2.22 m/s and 3.33 m/s, at 100%, 80%, 60%, 40%, and 20% body weight (BW). Surface electromyography, ground reaction force, and running characteristics were measured. Relative knee and ankle j

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Kothiyal, Kamal, Frank Li, and Ida Yiu. "A comparative study of load sharing among back and leg muscles during squat and half-kneeling lifts." Occupational Ergonomics 8, no. 1 (2008): 41–52. http://dx.doi.org/10.3233/oer-2008-8104.

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This paper presents the results of a comparative study of load sharing among back and leg muscles during squat and half-kneeling lifts. 19 young and healthy subjects with no history of low back pain or other musculoskeletal disorders participated in the study. Muscle activity was measured using electromyography (EMG) technique. Surface EMG electrodes were placed bilaterally at the erector spinae, quadriceps and hamstring muscles. Muscle activities were determined at different force levels representing 40, 60 and 80 percent of maximal voluntary contraction (MVC). The results showed increase in

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Gannon, Timothy, Daniel Landers, Karla Kubitz, Walter Salazar, and Steven Petruizello. "An Analysis of Temporal Electroemeeptialograpliic Patterning Prior to Initiation of the Arm Curl." Journal of Sport and Exercise Psychology 14, no. 1 (1992): 87–100. http://dx.doi.org/10.1123/jsep.14.1.87.

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To determine if the different EEG patterns noted in previous studies were due to between-task differences in muscular exertion, the present study examined the electroencephalographic (EEG) activity in the seconds prior to either holding the weight (without lifting) or executing an arm lift at either 25% or 95% of the subject's one-repetition maximum value. Temporal EEG and tempomandibular and trapezius electromyography (EMG) measures were obtained from subjects (N=20) in the half-second period during the holding of the weight or immediately before lifting the weight. The degree of attentional

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Waddell, T. B., M. Giglio, W. Johnston, W. C. Miller, and B. Fernhall. "IMMEDIATE VO2 AND HEART RATE RESPONSE TO LEG EXTENSION USING SUPER SLOW AND CIRCUIT WEIGHT LIFTING TECHNIQUES." Medicine & Science in Sports & Exercise 33, no. 5 (2001): S331. http://dx.doi.org/10.1097/00005768-200105001-01858.

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MacDougall, J. D., D. Tuxen, D. G. Sale, J. R. Moroz, and J. R. Sutton. "Arterial blood pressure response to heavy resistance exercise." Journal of Applied Physiology 58, no. 3 (1985): 785–90. http://dx.doi.org/10.1152/jappl.1985.58.3.785.

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The purpose of this study was to record the blood pressure response to heavy weight-lifting exercise in five experienced body builders. Blood pressure was directly recorded by means of a capacitance transducer connected to a catheter in the brachial artery. Intrathoracic pressure with the Valsalva maneuver was recorded as mouth pressure by having the subject maintain an open glottis while expiring against a column of Hg during the lifts. Exercises included single-arm curls, overhead presses, and both double- and single-leg presses performed to failure at 80, 90, 95, and 100% of maximum. Systol

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Daneau, Catherine, Charles Tétreau, Thomas Deroche, Camille Mainville, Vincent Cantin, and Martin Descarreaux. "Impact of load expectations on neuromuscular and postural strategies during a freestyle lifting task in individuals with and without chronic low back pain." PLOS ONE 16, no. 2 (2021): e0246791. http://dx.doi.org/10.1371/journal.pone.0246791.

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Objective This study aimed to investigate how load expectations modulate neuromuscular and postural strategies in the anticipation of a freestyle lifting task with varying expected loads in individuals with and without chronic low back pain (cLBP). Methods Forty-seven participants, 28 with cLBP pain and 19 without, were recruited and completed a series of freestyle lifting trials (3 sets of box lifted for a total of 36 lifts). Verbal cues were used to modulate their expectations about the boxes’ weight: no expectation, lighter or heavier load expectations. Following each set, participants rate

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Na, Jonathan Seung Doe, and Philip C. Dittmar. "Diabetic amyotrophy, not your typical back pain." BMJ Case Reports 13, no. 1 (2020): e231928. http://dx.doi.org/10.1136/bcr-2019-231928.

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A 49-year-old man presented to the hospital for spinal cord decompression surgery with left buttock and left leg pain. The patient described an acute burning pain radiating down from his left buttock to left lateral leg. He also noted a 13.6 kg weight loss in recent months. Physical examination showed decreased muscle bulk of the left thigh, decreased strength of the left hip, left knee flexors and extensors. Recent MRI spine showed mild canal narrowing and cord flattening in the lower thoracic spine. Serologic testing showed an elevated glucose of 17.9 mmol/L and haemoglobin A1c of 9.8%. Elec

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Lentini, A. C., R. S. McKelvie, N. McCartney, C. W. Tomlinson, and J. D. MacDougall. "Left ventricular response in healthy young men during heavy-intensity weight-lifting exercise." Journal of Applied Physiology 75, no. 6 (1993): 2703–10. http://dx.doi.org/10.1152/jappl.1993.75.6.2703.

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We examined cardiac volumes (using echocardiography), intra-arterial blood pressure (BP), and intrathoracic pressure (ITP) in healthy males performing leg press exercise to failure at 95% of their maximum dynamic strength. Compared with preexercise, during the lifting phase of exercise, end-diastolic volume (EDV; 147 +/- 8 to 103 +/- 7 ml) and end-systolic volume (ESV; 54 +/- 5 to 27 +/- 4 ml) decreased (P < 0.05); heart rate (82 +/- 6 to 143 +/- 5 beats/min), systolic BP (160 +/- 6 to 270 +/- 21 Torr), diastolic BP (91 +/- 2 to 183 +/- 18 Torr), ITP (0.8 +/- 0.8 to 57.8 +/- 24 Torr), and p

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25

Castro, Alexis H., Dylan Zangakis, and Gavin L. Moir. "The Effects of Accentuated Eccentric Loading on Mechanical Variables and Agonist Electromyography during the Bench Press." Sports 8, no. 6 (2020): 79. http://dx.doi.org/10.3390/sports8060079.

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We compared the effects of accentuated eccentric loading (AEL) on mechanical variables and agonist muscle activation using low (30% 1-repetition maximum (1RM)) and high (80% 1RM) upward-phase loading with AEL (100% 1RM during downward phase) to traditional loading schemes (T) in the bench press. Twelve resistance-trained men (26 ± 6 years; 1RM: 134 ± 33 kg) performed sets of two repetitions with three-minute intervals using loading schemes of 30AEL, 30T, 80AEL, and 80T. AEL was applied using weight releasers while force plates and a 3D motion-analysis system were used to measure mechanical var

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Ji, Xinyu, Dashuai Wang, Pengfei Li, Liangsheng Zheng, Jianquan Sun, and Xinyu Wu. "SIAT-WEXv2: A Wearable Exoskeleton for Reducing Lumbar Load during Lifting Tasks." Complexity 2020 (November 28, 2020): 1–12. http://dx.doi.org/10.1155/2020/8849427.

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Lumbar Exoskeleton, as an important instance of wearable exoskeleton, has broad application prospects in logistics, construction, and other industries. Specifically, in the working scenarios that require long-term and repeated bending and rising movements, active lumbar exoskeleton (ALE) can provide effective protection and flexible assistance to wear’s waist muscles and bones, which will significantly reduce the risk of lumbar muscle strain. How to improve the human-machine coupling and enhance the assistance performance are the main challenges for ALE’s development. Based on the biomechanica

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Magnus, Charlene R. A., and Jonathan P. Farthing. "Greater bilateral deficit in leg press than in handgrip exercise might be linked to differences in postural stability requirements." Applied Physiology, Nutrition, and Metabolism 33, no. 6 (2008): 1132–39. http://dx.doi.org/10.1139/h08-101.

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Bilateral deficit is defined as the difference in the summed force between contracting muscles alone and contracting contralateral homologous muscles in combination. The purpose of the study was to investigate how postural stability influences bilateral deficit by comparing an exercise requiring more postural stability (the leg press) with an exercise requiring less postural stability (the handgrip). Eight participants volunteered for the study (3 males, 5 females). Maximal strength was determined by a 1-repetition maximum for the leg press (weight machine) and handgrip (dynamometer) exercises

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28

Rapčan, R., L. Kočan, H. Alfredson та ін. "Elusive Diagnosis of Superﬁcial Peroneal Nerve Entrapment Case report". General Reanimatology 17, № 4 (2021): 29–36. http://dx.doi.org/10.15360/1813-9779-2021-2-00-00.

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Isolated neuropathy of the superﬁcial peroneal nerve (SPN) is a relatively rare type of peripheral neuropathy. It is linked to the mechanical entrapment of the SPN in predisposed locations of its anatomical pathway. Associated clinical ﬁndings are insuﬃcient lifting of the latero-dorsal part of the foot, stepping on the lateral border of the foot, and commonly, a strong pain localized in the nerve dermatome.Case report. We describe a case of a 14-year-old female patient with right leg pain lasting 24 months. Repeated neurological examinations with negative ﬁndings on electromyography (EMG) wer

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Ko, Chang-Hee, Heon-Seock Cynn, Ji-Hyun Lee, Tae-Lim Yoon, and Sil-Ah Choi. "Figure-8 Strap Application: Immediate Alteration of Pectoralis Minor Length and Scapular Alignment During Arm-Lifting Exercise in Participants With Forward Shoulder Posture." Journal of Sport Rehabilitation 25, no. 3 (2016): 273–79. http://dx.doi.org/10.1123/jsr.2015-0002.

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Context:Scapular bracing can correct scapular kinematics and restore normal scapular-muscle activity. However, there is little evidence to support the beneficial effects of a figure-8 strap, a type of scapular bracing, on muscle length, scapular alignment, and muscle activity during arm-lifting exercise.Objective:To investigate the immediate effect of a figure-8 strap on pectoralis minor length, scapular alignment, and scapular upward-rotator-muscle activity.Design:Cross-sectional study.Setting:Research laboratory.Participants:Fifteen male participants (age 22.1 ± 1.9 y, weight 68.2 ± 5.7 kg,

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Sathival, Mugiillan, I. Nyoman Mangku Karmaya, and Yuliana . "Prevalence of scoliosis in excessive weight bearing female market workers more than 50 years old and working more than 5 years in Pasar Kumbasari, Denpasar, Bali." Bali Anatomy Journal 1, no. 1 (2018): 17–20. http://dx.doi.org/10.36675/baj.v1i1.9.

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Market workers tend to work a lot in order to feed their family. A lot of human labour work is done at the expense of their health status in order to make a living. Aim: This study was conducted to determine the prevalence of scoliosis in female market workers in Pasar Kumbasari, Denpasar, Bali and the load lifting technique used to carry the loads in the market. Methods: This is a cross sectional descriptive study done with non-probability consecutive sampling. Questionnaires were distributed to aid in obtaining information regarding the study. Results: Of the total 115 female market workers

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Russo, Matteo, Daniele Cafolla, and Marco Ceccarelli. "Design and Experiments of a Novel Humanoid Robot with Parallel Architectures." Robotics 7, no. 4 (2018): 79. http://dx.doi.org/10.3390/robotics7040079.

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In this paper, the mechanical design of the LARMbot 2, a low-cost user-oriented humanoid robot was presented. LARMbot 2 is characterized by parallel architectures for both the torso and legs. The proposed design was presented with the kinematics of its main parts—legs, torso, arms—and then compared to its previous version, which was characterized by a different leg mechanism, to highlight the advantages of the latest design. A prototype was then presented, with constructive details of its subsystems and its technical specifications. To characterize the performance of the proposed robot, experi

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Isakov, E., O. Keren, and N. Benjuya. "Transtibial amputee gait: Timedistance parameters and EMG activity." Prosthetics and Orthotics International 24, no. 3 (2000): 216–20. http://dx.doi.org/10.1080/03093640008726550.

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Gait analysis of transtibial (TT) amputees discloses asymmetries in gait parameters between the amputated and sound legs. The present study aimed at outlining differences between both legs with regard to kinematic parameters and activity of the muscles controlling the knees. The gait of 14 traumatic TT amputees, walking at a mean speed of 74.96 m/min, was analysed by means of an electronic walkway, video camera, and portable electromyography system. Results showed differences in kinematic parameters. Step length, step time and swing time were significantly longer, while stance time and single

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Ermolao, Andrea, Michela Brogi, Veronica Baioccato, and Sara Rovai. "Unsafe workout: a weak and painful shoulder in a professional volleyball player." BMJ Case Reports 12, no. 5 (2019): e228084. http://dx.doi.org/10.1136/bcr-2018-228084.

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A 29-year-old professional volleyball player started complaining of a dull ache in the right lateral base of the neck. This pain arose during a preseasonal athletic training intense session. After 3 days, he presented deficiency of right scapula adduction, limitation of scapula elevation, right shoulder weakness and local mild pain. He had asymmetrical neckline with drooping of the affected shoulder, lateral displacement and minimal winging of the right scapula. After 1 week, hypothrophy of superior trapezius appeared. An electromyography of right upper limb showed a denervation in the upper,

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Yu, S.-N., J.-H. Jang, D.-H. Kim, J.-Y. Lee, and C.-S. Han. "A gait-assistive mobile robot based on a body weight support and autonomous path tracking system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 3 (2011): 828–41. http://dx.doi.org/10.1177/0954406211416541.

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With the rising numbers of elderly and disabled people, the demand for welfare services using a robotic system and not involving human effort is likewise increasing. This study deals with a mobile robot system combined with a body weight support (BWS) system for gait rehabilitation. The BWS system was designed via the kinematic analysis of the robot's body-lifting characteristics and of the walking guide system that controls the total rehabilitation system integrated in the mobile robot. This mobile platform is operated by utilizing the autonomous guided vehicle driving algorithm. Especially,

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Lin, Cindy Y., Liang-Ching Tsai, Joel Press, Yupeng Ren, Sun G. Chung, and Li-Qun Zhang. "Lower-Limb Muscle-Activation Patterns During Off-Axis Elliptical Compared With Conventional Gluteal-Muscle-Strengthening Exercises." Journal of Sport Rehabilitation 25, no. 2 (2016): 164–72. http://dx.doi.org/10.1123/jsr.2014-0307.

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Context:Gluteal-muscle strength has been identified as an important component of injury prevention and rehabilitation in several common knee injuries. However, many conventionally prescribed gluteal-strengthening exercises are not performed during dynamic weight-bearing activities, which is when most injuries occur.Objectives:To compare lower-limb muscle-activation patterns between conventional gluteal-strengthening exercises and off-axis elliptical exercises with motorized foot-plate perturbations designed to activate gluteal muscles during dynamic exercise.Evidence Acquisition:Twelve healthy

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Chander, Harish, John C. Garner, Chip Wade, and Adam C. Knight. "Lower Extremity Muscle Activation in Alternative Footwear during Stance Phase of Slip Events." International Journal of Environmental Research and Public Health 18, no. 4 (2021): 1533. http://dx.doi.org/10.3390/ijerph18041533.

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Muscle activity from the slipping leg have been previously used to analyze slip induced falls. However, the impact of casual alternative footwear on slipping leg muscle activity when exposed to slippery environments is still unknown. The purpose of the study was to analyze the impact of alternative footwear (crocs (CC) and flip-flops (FF)) compared to slip-resistant footwear (LT) on lower extremity muscle activity when exposed to dry gait (NG), unexpected (US), alert (AS), and expected slips (ES). Eighteen healthy males (age: 22.3 ± 2.2 years; height: 177.7 ± 6.9 cm; weight: 79.3 ± 7.6 kg) com

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Weston, Eric B., Jonathan S. Dufour, Ming-Lun Lu, and William S. Marras. "A Comparision Of Spinal Loads While Lifting In Confined Vertical Space." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 63, no. 1 (2019): 1130–31. http://dx.doi.org/10.1177/1071181319631014.

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Background: Lifting in confined vertical space is observed across several industries, including airline baggage handling, mining, construction, maintenance, and shipbuilding. However, only a few studies have investigated confined space lifting scenarios with biomechanical methods (Gallagher et al., 1988; Stalhammar et al., 1986), and fewer have quantified biomechanical loads on the intervertebral discs of the lumbar spine while lifting in confined vertical spaces using a biomechanical model (Gallagher et al., 1994; Middelton et al., 2016; Splittstoesser et al., 2007). The objective of this stu

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Torres, Mauricio Plaza, and William Aperador. "Orthosis for Surgery Procedures." Applied Mechanics and Materials 598 (July 2014): 109–13. http://dx.doi.org/10.4028/www.scientific.net/amm.598.109.

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Prolonged standing at work has been linked to health problems including foot, leg and back pain, varicose veins, circulatory problems, including a possible increased stroke risk. [1]. There are many other potentially very serious health concerns. Worsening of existing coronary heart disease as well as varicose veins and chronic venous insufficiency has been associated with prolonged standing. Pain in the lower limbs and feet are also associated. [2] Studies suggest back pain associated with long surgery is about twice as common in those who stand compared to those medical staff who usually wor

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Sivous, G. I. "New approaches to treating diabetic peripheral polyneuropathy in children and adolescents." Problems of Endocrinology 49, no. 5 (2003): 11–16. http://dx.doi.org/10.14341/probl11715.

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А hundred and seven patients (56 males and 51 females) aged 8 to 21 years who had suclinical and mild diabetic peripheral polyneuropathy received pathogenetic treatment. Thirty-nine patients took a combined drug including benfotiamine and pyridoxine in a daily dose of 300 mg for 6 weeks. Twenty-three and 45 patients were given a-lipoic acid in a daily dose of 10-15 mg/kg body weight for 8 and 12 weeks, respectively. The treatment was monitored by using the Total Symptoms Score and the Neuropathy Impairment Score for the Lower Extremities, stimulation electromyography of two nerves of the leg.

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Abe, Daijiro, Yoshiyuki Fukuoka, and Masahiro Horiuchi. "Why do we transition from walking to running? Energy cost and lower leg muscle activity before and after gait transition under body weight support." PeerJ 7 (December 17, 2019): e8290. http://dx.doi.org/10.7717/peerj.8290.

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Background Minimization of the energetic cost of transport (CoT) has been suggested for the walk-run transition in human locomotion. More recent literature argues that lower leg muscle activities are the potential triggers of the walk-run transition. We examined both metabolic and muscular aspects for explaining walk-run transition under body weight support (BWS; supported 30% of body weight) and normal walking (NW), because the BWS can reduce both leg muscle activity and metabolic rate. Methods Thirteen healthy young males participated in this study. The energetically optimal transition speed

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Fancy, S. G., and R. G. White. "Energy expenditures for locomotion by barren-ground caribou." Canadian Journal of Zoology 65, no. 1 (1987): 122–28. http://dx.doi.org/10.1139/z87-018.

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Energy expenditure during locomotion on a level treadmill, up and down slopes, and in snow was measured for barren-ground caribou (Rangifer tarandus granti) and compared with that of other species and other subspecies of Rangifer. Highly significant (p < 0.001) linear relationships between [Formula: see text] and walking speed were found for all caribou, indicating that the net cost of walking a given distance was independent of walking speed. The net cost of locomotion (i.e., additional to the cost of standing) for six barren-ground caribou (0.068–0.095 mL O2/(g∙km)) was the lowest of any

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Şahin, Yusuf, Fatih Mehmet Botsalı, Mete Kalyoncu, et al. "Force Feedback Control of Lower Extremity Exoskeleton Assisting of Load Carrying Human." Applied Mechanics and Materials 598 (July 2014): 546–50. http://dx.doi.org/10.4028/www.scientific.net/amm.598.546.

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Lower extremity exoskeletons are wearable robot manipulators that integrate human intelligence with the strength of legged robots. Recently, lower extremity exoskeletons have been specifically developed for rehabilitation, military, industrial applications and rescuing, heavy-weight lifting and civil defense applications. This paper presents controller design of a lower-extremity exoskeleton for a load carrying human to provide force feedback control against to external load carried by user during walking, sitting, and standing motions. Proposed exoskeleton system has two legs which are powere

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Kirking, Bryan. "A Muscle/Ligament Model to Predict Loads on L5/S1 during Three Dimensional Lifting." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 41, no. 1 (1997): 680–84. http://dx.doi.org/10.1177/1071181397041001149.

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A muscle / ligament model was constructed to estimate the spinal load that resulted from both muscle and ligament sources during dynamic, three dimensional lifting tasks. The model was tested using data from ten subjects performing lifts over a range of realistic industrial conditions (velocity: 10, 20, or 30 degrees / second; asymmetry: 0, 15, or 30 degrees; and weight lifted: 13.6 or 22.7 Kg). During the task, three dimensional trunk position, trunk velocity, the reaction forces, the reaction moments, and the electromyography of the major trunk musculature were collected. Ligaments were repr

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Barnes, Matthew J., Toby Mündel, and Stephen R. Stannard. "The effects of acute alcohol consumption and eccentric muscle damage on neuromuscular function." Applied Physiology, Nutrition, and Metabolism 37, no. 1 (2012): 63–71. http://dx.doi.org/10.1139/h11-137.

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Voluntary and electrically stimulated muscular performance was examined to identify the effects of acute alcohol consumption on neuromuscular function in the presence and absence of exercise-induced muscle damage (EIMD). After initial neuromuscular performance measures were made, 12 subjects completed a bout of eccentric exercise (EX) using the quadriceps muscles of 1 leg while the remaining 11 subjects did not exercise (NX). Subjects then consumed either an alcoholic beverage containing 1 g·kg–1body weight (ALC) or a nonalcoholic beverage (OJ). On another occasion the contralateral leg of bot

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Hogg, Jennifer A., Terry Ackerman, Anh-Dung Nguyen, et al. "The Effects of Gluteal Strength and Activation on the Relationship Between Femoral Alignment and Functional Valgus Collapse During a Single-Leg Landing." Journal of Sport Rehabilitation 30, no. 6 (2021): 942–51. http://dx.doi.org/10.1123/jsr.2019-0528.

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Context: A bias toward femoral internal rotation is a potential precursor to functional valgus collapse. The gluteal muscles may play a critical role in mitigating these effects. Objective: Determine the extent to which gluteal strength and activation mediate associations between femoral alignment measures and functional valgus collapse. Design: Cross-sectional. Setting: Research laboratory. Patients or Other Participants: Forty-five females (age = 20.1 [1.7] y; height = 165.2 [7.6] cm; weight = 68.6 [13.1] kg) and 45 males (age = 20.8 [2.0] y; height = 177.5 [8.7] cm; weight = 82.7 [16.5] kg)

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Musselman, Kristin E., and Jaynie F. Yang. "Loading the Limb During Rhythmic Leg Movements Lengthens the Duration of Both Flexion and Extension in Human Infants." Journal of Neurophysiology 97, no. 2 (2007): 1247–57. http://dx.doi.org/10.1152/jn.00891.2006.

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Sensory input is critical for adapting motor outputs to meet environmental conditions. A ubiquitous force on all terrestrial animals is gravity. It is possible that when performing rhythmic movements, animals respond to load-related feedback in the same way by prolonging the muscle activity resisting the load. We hypothesized that for rhythmic leg movements, the period (extension or flexion) experiencing the higher load will be longer and vary more strongly with cycle period. Six rhythmic movements were studied in human infants (aged 3–10 mo), each providing different degrees of load-related f

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Baumann, Wolfgang, Volker Gross, Karl Quade, Peter Galbierz, and Ansgar Schwirtz. "The Snatch Technique of World Class Weightlifters at the 1985 World Championships." International Journal of Sport Biomechanics 4, no. 1 (1988): 68–89. http://dx.doi.org/10.1123/ijsb.4.1.68.

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The purpose of this study was (a) to describe the snatch technique in terms of kinematic and external and internal kinetic parameters, and (b) to compare the results for athletes of different groups and weight categories. By means of three-dimensional film analysis and measurements of ground reaction forces during the 1985 World Championships in Sweden, it was possible to analyze the spatial movements and to calculate joint moments of force in each leg. Concerning the kinematics, a snatch technique starting with a strong pull toward the lifter could be established. The most interesting kinetic

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Hiebert, Gordon W., and Keir G. Pearson. "Contribution of Sensory Feedback to the Generation of Extensor Activity During Walking in the Decerebrate Cat." Journal of Neurophysiology 81, no. 2 (1999): 758–70. http://dx.doi.org/10.1152/jn.1999.81.2.758.

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Contribution of sensory feedback to the generation of extensor activity during walking in the decerebrate cat. In this investigation we have estimated the afferent contribution to the generation of activity in the knee and ankle extensor muscles during walking in decerebrate cats by loading and unloading extensor muscles, and by unilateral deafferentation of a hind leg. The total contribution of afferent feedback to extensor burst generation was estimated by allowing one hind leg to step into a hole in the treadmill belt on which the animal was walking. In the absence of ground support the lev

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Hakkinen, K., A. Pakarinen, M. Alen, H. Kauhanen, and P. V. Komi. "Neuromuscular and hormonal adaptations in athletes to strength training in two years." Journal of Applied Physiology 65, no. 6 (1988): 2406–12. http://dx.doi.org/10.1152/jappl.1988.65.6.2406.

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Neuromuscular and hormonal adaptations to prolonged strength training were investigated in nine elite weight lifters. The average increases occurred over the 2-yr follow-up period in the maximal neural activation (integrated electromyogram, IEMG; 4.2%, P = NS), maximal isometric leg-extension force (4.9%, P = NS), averaged concentric power index (4.1%, P = NS), total weight-lifting result (2.8%, P less than 0.05), and total mean fiber area (5.9%, P = NS) of the vastus lateralis muscle, respectively. The training period resulted in increases in the concentrations of serum testosterone from 19.8

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Taloni, Silvia, Giovanni Carlo Cassavia, Giuseppe Luca Ciavarro, Giuseppe Andreoni, Giorgio Cesare Santambrogio, and Antonio Pedotti. "An index for back pain risk assessment in nursery activities." Occupational Ergonomics 4, no. 4 (2005): 281–90. http://dx.doi.org/10.3233/oer-2004-4405.

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Back pain is one of the most significant socioeconomic problem in industrialized countries. Its origin is multifactorial, including physical, psychosocial and individual risk factors. Among the working population, nursery teachers are highly exposed to back pain diseases, but not many studies have dealt with this problem. So a suitable quantitative index is proposed, based on an unobtrusive video-analysis of established motor-tasks. In particular five nursery teachers were asked to perform lifting and lowering movements placing their feet at two different distances from a weight (a toy pet loa

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