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Journal articles on the topic 'Muscle activity changes'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Hidaka, O., M. Yanagi, and K. Takada. "Mental Stress-induced Physiological Changes in the Human Masseter Muscle." Journal of Dental Research 83, no. 3 (2004): 227–31. http://dx.doi.org/10.1177/154405910408300308.

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The effect of a long mental stress on the hemodynamics of masticatory muscles has not been investigated to date. We hypothesized some hemodynamic and electromyographic changes in jaw-closure muscles related to sympathetic nervous system activity. While healthy adult female volunteers performed a two-hour mental stress task, electromyographic activity of the temporal and masseteric muscles was recorded, and hemodynamic changes of the masseter muscle were measured non-invasively. Autonomic function was assessed by heart rate spectral analysis. Integrated electromyographic activity of the tempora

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2

Y*, Li. "Effects of Physical Activity on Lower Extremity Muscle Pump and Volume Changes." Ergonomics International Journal 8, no. 2 (2024): 1–6. http://dx.doi.org/10.23880/eoij-16000327.

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The objective of the research was to explore the effects of human motion type and angles of inclination on lower limb muscle activity and lower extremity volume change. The muscle activity was quantified by the time domain of the EMG signal. The change in calf circumference and in foot volumeter helped assess the fluid shifts in the lower extremity and the lower limb volume. The results found a significant main effect of motion type on lower extremity muscle activity. Specifically, running was revealed to lead to greater muscle contractions. Also, the calf circumference increase was significan

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Jiang, He, Kang Rao, Xueliang Liu, Andrew J. Halayko, Gang Liu, and Newman L. Stephens. "Early changes in airway smooth muscle hyperresponsiveness." Canadian Journal of Physiology and Pharmacology 72, no. 11 (1994): 1440–47. http://dx.doi.org/10.1139/y94-208.

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To study asthmatic airway smooth muscle we developed a canine model of ragweed pollen sensitized, airway hyperresponsiveness because of the difficulties in obtaining human tissue. Tracheal and bronchial smooth muscles from sensitized dogs were shown to possess greater ability to shorten and higher maximum shortening velocity (Vo), both of which contribute to the excessive narrowing of airways typical of human asthma. However, maximum force production remained normal, demonstrating the dissociation between the behaviour of shortening and force. Because we found no evidence of inflammation, hype

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Schindler-Ivens, Sheila, David A. Brown, and John D. Brooke. "Direction-Dependent Phasing of Locomotor Muscle Activity Is Altered Post-Stroke." Journal of Neurophysiology 92, no. 4 (2004): 2207–16. http://dx.doi.org/10.1152/jn.01207.2003.

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A major contributor to impaired locomotion post-stroke is abnormal phasing of muscle activity. While inappropriate paretic muscle phasing adapts to changing body orientation, load, and speed, it remains unclear whether paretic muscle phasing adapts to reversal of locomotor direction. We examined muscle phasing in backward pedaling, a task that requires shifts in biarticular but not uniarticular muscle phasing relative to forward pedaling. We hypothesized that if paretic and neurologically intact muscle phasing adapt similarly, then paretic biarticular but not paretic uniarticular muscles would

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Abe, Tadashi, Takumi Yamada, Tomoyuki Tomita, and Paul A. Easton. "Posture effects on timing of abdominal muscle activity during stimulated ventilation." Journal of Applied Physiology 86, no. 6 (1999): 1994–2000. http://dx.doi.org/10.1152/jappl.1999.86.6.1994.

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In humans during stimulated ventilation, substantial abdominal muscle activity extends into the following inspiration as postexpiratory expiratory activity (PEEA) and commences again during late inspiration as preexpiratory expiratory activity (PREA). We hypothesized that the timing of PEEA and PREA would be changed systematically by posture. Fine-wire electrodes were inserted into the rectus abdominis, external oblique, internal oblique, and transversus abdominis in nine awake subjects. Airflow, end-tidal CO2, and moving average electromyogram (EMG) signals were recorded during resting and CO

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Hashiguchi, Yu, Ryosuke Goto, and Toru Naka. "Effects of orthoses on muscle activity and synergy during gait." PLOS ONE 18, no. 2 (2023): e0281541. http://dx.doi.org/10.1371/journal.pone.0281541.

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An orthosis is often used in rehabilitation to improve kinetic and kinematic parameters during gait. However, whether changes in neural control depend on wearing an orthosis during gait is unclear. We measured the muscle activity and synergy of the lower limb muscles without orthosis and with two types of orthoses: ankle–foot orthosis (AFO) and knee–ankle–foot orthosis (KAFO). Muscle activity during gait was measured in 15 healthy adults, and muscle synergies were extracted using non-negative matrix factorization. The results revealed that some muscle activities were significantly different am

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Falla, D., D. Farina, M. Kanstrup Dahl, and T. Graven-Nielsen. "Muscle pain induces task-dependent changes in cervical agonist/antagonist activity." Journal of Applied Physiology 102, no. 2 (2007): 601–9. http://dx.doi.org/10.1152/japplphysiol.00602.2006.

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This study examined the effect of experimental neck muscle pain on the EMG-force relationship of cervical agonist and antagonist muscles. Surface EMG signals were detected from the sternomastoid, splenius capitis, and upper trapezius muscles bilaterally from 14 healthy subjects during cervical flexion and extension contractions of linearly increasing force from 0 to 60% of the maximum voluntary contraction (MVC). Measurements were performed before and after injection of 0.5 ml hypertonic and isotonic saline into either the sternomastoid or splenius capitis in two experimental sessions. EMG ave

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8

MO, Ericson, Nisell R, Arborelius UP, and Ekholm J. "Muscular activity during ergometer cycling." Journal of Rehabilitation Medicine 17, no. 2 (2020): 53–61. http://dx.doi.org/10.2340/165019771985175361.

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The aim of the study was to quantify the activity as recorded by electromyography during ergometer cycling in eleven different muscles of the lower extremity. Eleven healthy subjects rode in twelve different ways at different work-load, pedalling rate, saddle height and pedal foot position. Vastus medialis and lateralis, gastrocnemius medialis and lateralis and the soleus muscle were the most activated muscles. Changes in muscle activity during different calibrations were studied in eight of the eleven muscles. An increase in work-load significantly increased the mean maximum activity in all t

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9

Teulier, Caroline, Jennifer K. Sansom, Karin Muraszko, and Beverly D. Ulrich. "Longitudinal changes in muscle activity during infants' treadmill stepping." Journal of Neurophysiology 108, no. 3 (2012): 853–62. http://dx.doi.org/10.1152/jn.01037.2011.

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Previous research has described kinetic characteristics of treadmill steps in very stable steppers, in cross-sectional designs. In this study we examined, longitudinally, muscle activation patterns during treadmill stepping, without practice, in 12 healthy infants at 1, 6, and 12 mo of age. We assessed lateral gastrocnemius, tibialis anterior, rectus femoris, and biceps femoris as infants stepped on a treadmill during twelve 20-s trials. Infants showed clear changes in kinematics, such as increased step frequency, increased heel contact at touch down, and more flat-footed contact at midstance.

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10

Post, Marijn, Sibel Bayrak, Daniel Kernell, and Inge Zijdewind. "Contralateral muscle activity and fatigue in the human first dorsal interosseous muscle." Journal of Applied Physiology 105, no. 1 (2008): 70–82. http://dx.doi.org/10.1152/japplphysiol.01298.2007.

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During effortful unilateral contractions, muscle activation is not limited to the target muscles but activity is also observed in contralateral muscles. The amount of this associated activity is depressed in a fatigued muscle, even after correction for fatigue-related changes in maximal force. In the present experiments, we aimed to compare fatigue-related changes in associated activity vs. parameters that are used as markers for changes in central nervous system (CNS) excitability. Subjects performed brief maximal voluntary contractions (MVCs) with the index finger in abduction direction befo

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11

Mochizuki, Luis, Juliana Pennone, Aline Bigongiari, et al. "Standing on Elevated Platform Changes Postural Reactive Responses during Arm Movement." Brain Sciences 14, no. 10 (2024): 1004. http://dx.doi.org/10.3390/brainsci14101004.

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Background/Objectives: This study investigated the behavior of postural adjustments throughout the entire action: from the preparatory phase (anticipatory postural adjustment, APA), the focal movement phase (online postural adjustments, OPA), to the compensatory phase (compensatory postural adjustment, CPA) while raising the arms in a standing position, both with eyes opened and closed. The goal was to analyze the effects of reduced sensorial information and different heights on postural muscle activity during these three phases. Methods: Eight young women performed rapid shoulder flexion whil

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Dennerlein, Jack, Maria-Helena DiMarino, Ted Becker, and Peter Johnson. "Wrist and Shoulder Muscle Activity Changes Across Computer Tasks." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 46, no. 13 (2002): 1129–32. http://dx.doi.org/10.1177/154193120204601326.

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The computer workstation is a ubiquitous tool in the office work environment; however, its use varies across many different tasks from surfing the Internet to typing. The question, therefore, is how does exposure to different physical risk factors for musculoskeletal disorders vary across tasks? Fifteen adults (10 females, 5 males) completed tasks simulating work at a computer workstation. The tasks were typing text, completing an html-based form, editing a document, a graphics task, and finally navigating through a series of web pages. During these tasks the muscle activity of the wrist prime

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13

Moes, Jesse R., and Janean E. Holden. "Characterizing Activity and Muscle Atrophy Changes in Rats With Neuropathic Pain." Biological Research For Nursing 16, no. 1 (2013): 16–22. http://dx.doi.org/10.1177/1099800413502722.

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The study of neuropathic pain has focused on changes within the nervous system, but little research has described systemic changes that may accompany neuropathic pain. Objective: As part of a larger project characterizing the metabolic, activity, and musculoskeletal changes associated with neuropathic pain, the objective of the current study was to characterize changes in spontaneous activity and skeletal muscle mass using an established animal model of neuropathic pain, the chronic constriction injury (CCI) model. Method: Male Sprague-Dawley rats were used in this pre- and posttest quasi-expe

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van Lunteren, E., M. A. Haxhiu, E. C. Deal, J. S. Arnold, and N. S. Cherniack. "Respiratory changes in thoracic muscle length during bronchoconstriction." Journal of Applied Physiology 63, no. 1 (1987): 221–28. http://dx.doi.org/10.1152/jappl.1987.63.1.221.

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The purpose of the present study was to assess the effects of bronchoconstriction on respiratory changes in length of the costal diaphragm and the parasternal intercostal muscles. Ten dogs were anesthetized with pentobarbital sodium and tracheostomized. Respiratory changes in muscle length were measured using sonomicrometry, and electromyograms were recorded with bipolar fine-wire electrodes. Administration of histamine aerosols increased pulmonary resistance from 6.4 to 14.5 cmH2O X l–1 X s, caused reductions in inspiratory and expiratory times, and decreased tidal volume. The peak and rate o

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15

Oliven, A., and S. G. Kelsen. "Effect of hypercapnia and PEEP on expiratory muscle EMG and shortening." Journal of Applied Physiology 66, no. 3 (1989): 1408–13. http://dx.doi.org/10.1152/jappl.1989.66.3.1408.

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The present study examined the effects of hypercapnia and positive end-expiratory pressure (PEEP) on the electromyographic (EMG) activity and tidal length changes of the expiratory muscles in 12 anesthetized, spontaneously breathing dogs. The integrated EMG activity of both abdominal (external oblique, internal oblique, rectus abdominis, and transverse abdominis) and thoracic (triangularis sterni, internal intercostal) expiratory muscles increased linearly with increasing PCO2 and PEEP. However, with both hypercapnia and PEEP, the percent increase in abdominal muscle electrical activity exceed

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16

Bigard, A. X., A. Brunet, C. Y. Guezennec, and H. Monod. "Skeletal muscle changes after endurance training at high altitude." Journal of Applied Physiology 71, no. 6 (1991): 2114–21. http://dx.doi.org/10.1152/jappl.1991.71.6.2114.

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The effects of endurance training on the skeletal muscle of rats have been studied at sea level and simulated high altitude (4,000 m). Male Wistar rats were randomly assigned to one of four groups: exercise at sea level, exercise at simulated high altitude, sedentary at sea level, and sedentary at high altitude (n = 8 in each group). Training consisted of swimming for 1 h/day in water at 36 degrees C for 14 wk. Training and exposure to a high-altitude environment produced a decrease in body weight (P less than 0.001). There was a significant linear correlation between muscle mass and body weig

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Sahan, N. T. "PECULIARITIES OF MORPHOFUNCTIONAL CHANGES OF MASTICATORY MUSCLES IN IODINE-DEFICIENT CONDITIONS." Актуальні проблеми сучасної медицини: Вісник Української медичної стоматологічної академії 20, no. 3 (2020): 200–204. http://dx.doi.org/10.31718/2077-1096.20.3.200.

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The problem of iodine deficiency is becoming increasingly important in Ukraine. According to the United Nations Children’s Fund (UNICEF), each and all regions of Ukraine suffer from “hidden hunger”. The World Health Assembly has stated that the elimination of iodine deficiency will be as much a triumph for health care system as the eradication of smallpox and poliomyelitis. The goal of this study was to establish the peculiarities of structural organization of the masticatory muscles of rats in experimentally induced iodine deficiency. The research material involved masticatory muscle of 36 wh

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18

Carson, Richard G. "Changes in muscle coordination with training." Journal of Applied Physiology 101, no. 5 (2006): 1506–13. http://dx.doi.org/10.1152/japplphysiol.00544.2006.

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Three core concepts, activity-dependent coupling, the composition of muscle synergies, and Hebbian adaptation, are discussed with a view to illustrating the nature of the constraints imposed by the organization of the central nervous system on the changes in muscle coordination induced by training. It is argued that training invoked variations in the efficiency with which motor actions can be generated influence the stability of coordination by altering the potential for activity-dependent coupling between the cortical representations of the focal muscles recruited in a movement task and brain

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19

Kim, Bo Gyeom, Seong Hee Choi, Kyungjae Lee, and Chul-Hee Choi. "Efficacy of Laryngeal Massage in Patients with Muscle Tension Dysphonia: Changes in Surface Electromyography (sEMG) Activity." Communication Sciences & Disorders 28, no. 3 (2023): 658–68. http://dx.doi.org/10.12963/csd.23997.

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Objectives: Laryngeal massage has been used as a major voice therapy technique in patients with muscle tension dysphonia, which results in voice changes due to excessive tension in the intrinsic or extrinsic laryngeal muscles. This study aims to explore the effect of laryngeal massage by changing the activity potentials of paralaryngeal muscles through laryngeal massage. Methods: A total of 15 adults diagnosed with muscle tension dysphonia participated in this study. Laryngeal massage was performed for 15-20 minutes. To measure surface electromyography (sEMG), the surface electrodes were attac

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20

Choi, Won-Ho, and Yun-A. Shin. "Changes in Muscle Activity among College Pitchers Using 5- to 12-Oz Weighted Baseball." Asian Journal of Kinesiology 22, no. 4 (2020): 23–33. http://dx.doi.org/10.15758/ajk.2020.22.4.23.

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OBJECTIVES Several studies have reported that weighted baseball (WB) training is effective in improving ball speed; however, the weight of the ball suitable for training remains unclear. This study aimed to investigate the changes in muscle activity during pitching using 5- to12-oz WBs and to provide basic data for training programs to improve pitching speed.METHODS The subjects of this study were 10 overhand pitchers who had more than 5 years of experience. Muscle activity was measured and analyzed at 70–85% of throwing baseball maximum effort (TBME) during soft toss (ST) and TBME was evaluat

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21

Hidaka, O., M. Yanagi, and K. Takada. "Changes in Masseteric Hemodynamics Time-related to Mental Stress." Journal of Dental Research 83, no. 2 (2004): 185–90. http://dx.doi.org/10.1177/154405910408300220.

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Mental stress may cause a dissociation of sympathetic outflow to different regions. However, it remains unclear how the sympathetic outflow to jaw muscles is related to other sympathetic outflow under mental stress. The objective of this study was to clarify the temporal relationship between the finger sweat expulsion elicited by mental stress and the hemodynamic and electromyographic changes in the masseter muscle. Healthy adult female volunteers participated in this study. Masseteric hemodynamic changes were closely time-related to mental stress, showing a decrease in oxygen saturation of mu

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22

Loeb, G. E., J. A. Hoffer, and C. A. Pratt. "Activity of spindle afferents from cat anterior thigh muscles. I. Identification and patterns during normal locomotion." Journal of Neurophysiology 54, no. 3 (1985): 549–64. http://dx.doi.org/10.1152/jn.1985.54.3.549.

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The naturally occurring activity patterns of anterior thigh muscle spindle afferents were recorded during unrestrained treadmill locomotion by means of floating microelectrodes chronically implanted in the fifth lumbar dorsal root ganglion. Conduction velocity of units from primary and secondary endings was determined by spike-triggered averaging of the signals from a chronically implanted nerve cuff. Activity from knee extensor muscle spindles generally occurred during periods of muscle lengthening, but was often greater for small stretches when the muscle was active (during stance phase of w

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Kobuch, Sophie, Azharuddin Fazalbhoy, Rachael Brown, Vaughan G. Macefield, and Luke A. Henderson. "Muscle sympathetic nerve activity-coupled changes in brain activity during sustained muscle pain." Brain and Behavior 8, no. 3 (2018): e00888. http://dx.doi.org/10.1002/brb3.888.

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Pearson, J. K., and D. W. Sickles. "Enzyme activity changes in rat soleus motoneurons and muscle after synergist ablation." Journal of Applied Physiology 63, no. 6 (1987): 2301–8. http://dx.doi.org/10.1152/jappl.1987.63.6.2301.

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Quantitative enzyme histochemical methods have been used to determine the effect of ablation of synergists on the oxidative metabolism of the alpha-motoneurons and muscle fibers of the rat soleus. Sixty days postablation, the NADH-tetrazolium reductase (NADH-TR) activity of soleus motoneurons decreased 12.5% from 0.327 +/- 0.005 (mean +/- SE; optical density units) to 0.286 +/- 0.007. In the muscle fibers, the alpha-glycerophosphate dehydrogenase activity (glycolytic enzyme) decreased from 0.114 +/- 0.010 to 0.074 +/- 0.009, a change of 35.1%, and the NADH-TR activity decreased 21.2% from 0.34

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25

Richardson, C., and M. I Bullock. "Changes in muscle activity during fast, alternating flexion-extension movements of the knee." Journal of Rehabilitation Medicine 18, no. 2 (2020): 51–58. http://dx.doi.org/10.2340/165019771986185158.

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The effects of high frequency alternating knee flexion-extension on muscle activity of the quadriceps and hamstring muscle groups has been investigated. Standard loads were used for each subject. The muscle activity in vastus medialis, vastus lateralis, rectus femoris and the lateral hamstrings were recorded by electromyography during increasing velocities. Rectus femoris and hamstrings were found to increase their activities significantly with increasing speed while vastus medialis and vastus lateralis showed no such change. The individual thigh muscles thus differ in function in relation to

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26

Yun, Sangho, Daegu Son, Hyeonjung Yeo, et al. "Changes of Eyebrow Muscle Activity with Aging." Plastic and Reconstructive Surgery 133, no. 4 (2014): 455e—463e. http://dx.doi.org/10.1097/prs.0000000000000052.

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Cronin, Neil J., Jussi Peltonen, Thomas Sinkjaer, and Janne Avela. "Neural Compensation Within the Human Triceps Surae During Prolonged Walking." Journal of Neurophysiology 105, no. 2 (2011): 548–53. http://dx.doi.org/10.1152/jn.00967.2010.

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During human walking, muscle activation strategies are approximately constant across consecutive steps over a short time, but it is unknown whether they are maintained over a longer duration. Prolonged walking may increase tendinous tissue (TT) compliance, which can influence neural activation, but the neural responses of individual muscles have not been investigated. This study investigated the hypothesis that muscle activity is up- or down-regulated in individual triceps surae muscles during prolonged walking. Thirteen healthy subjects walked on a treadmill for 60 min at 4.5 km/h, while tric

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Inchingolo, Francesco, Assunta Patano, Angelo Michele Inchingolo, et al. "Analysis of Mandibular Muscle Variations Following Condylar Fractures: A Systematic Review." Journal of Clinical Medicine 12, no. 18 (2023): 5925. http://dx.doi.org/10.3390/jcm12185925.

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This review analyzes muscle activity following mandibular condylar fracture (CF), with a focus on understanding the changes in masticatory muscles and temporomandibular joint (TMJ) functioning. Materials and Methods: The review was conducted following the preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines. A search was performed on online databases using the keywords “masticatory muscles” AND (“mandibular fracture” OR “condylar fracture”). The eligibility criteria included clinical trials involving human intervention and focusing on muscle activity following

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Z˙ernicka, E., E. Smol, J. Langfort, and M. Górecka. "Time course of changes in lipoprotein lipase activity in rat skeletal muscles during denervation-reinnervation." Journal of Applied Physiology 92, no. 2 (2002): 535–40. http://dx.doi.org/10.1152/japplphysiol.00820.2001.

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The effects of denervation-reinnervation after sciatic nerve crush on the activity of extracellular and intracellular lipoprotein lipase (LPL) were examined in the soleus and red portion of gastrocnemius muscles. The activity of both LPL fractions was decreased in the two muscles within 24 h after the nerve crush and remained reduced for up to 2 wk. During the reinnervation period, LPL activity was still reduced in the soleus and started to increase only on the 40th day. In the red gastrocnemius, LPL activity increased progressively with reinnervation, exceeding control values on the 30th day

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Seo, Seong-Ik, Eui-Young Jung, Woo-Lim Mun, and Su-Yeon Roh. "Changes in Shoulder Girdle Muscle Activity and Ratio During Pilates-Based Exercises." Life 15, no. 2 (2025): 303. https://doi.org/10.3390/life15020303.

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Among the Pilates-based exercises, the modified side-arm (MSA) and modified high-five (MHF) are commonly used for shoulder strengthening and rehabilitation. This study examined shoulder girdle muscle activity and ratios across different spring intensities. Twenty-two healthy males performed the MSA and MHF using yellow (low), blue (medium), and red (high) springs. Surface electromyography (EMG) was used to measure serratus anterior (SA), lower trapezius (LT), levator scapulae (LS), upper trapezius (UT), and middle deltoid (MD) muscle activity, along with LS/SA, LS/LT, and UT/LT ratios during c

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Shirley, D., P. W. Hodges, A. E. M. Eriksson, and S. C. Gandevia. "Spinal stiffness changes throughout the respiratory cycle." Journal of Applied Physiology 95, no. 4 (2003): 1467–75. http://dx.doi.org/10.1152/japplphysiol.00939.2002.

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Posteroanterior stiffness of the lumbar spine is influenced by factors, including trunk muscle activity and intra-abdominal pressure (IAP). Because these factors vary with breathing, this study investigated whether stiffness is modulated in a cyclical manner with respiration. A further aim was to investigate the relationship between stiffness and IAP or abdominal and paraspinal muscle activity. Stiffness was measured from force-displacement responses of a posteroanterior force applied over the spinous process of L2and L4. Recordings were made of IAP and electromyographic activity from L4/L2ere

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Klitgaard, H., A. Brunet, B. Maton, C. Lamaziere, C. Lesty, and H. Monod. "Morphological and biochemical changes in old rat muscles: effect of increased use." Journal of Applied Physiology 67, no. 4 (1989): 1409–17. http://dx.doi.org/10.1152/jappl.1989.67.4.1409.

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Male Wistar rats were strength and swim trained during a substantial period of old age to determine the influence of aging and activity on the histochemical and metabolic characteristics of a predominantly slow (soleus) and a predominantly fast (plantaris) skeletal muscle. Strength training counteracted the age-related atrophy of the fibers and the age-induced changes in fiber-type distribution of both muscles. Swim training, on the other hand, was without any effect on these parameters. The activity of both mitochondrial and cytoplasmic enzymes became lower with aging in the soleus muscle, wh

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Gorassini, Monica A., Jonathan A. Norton, Jennifer Nevett-Duchcherer, Francois D. Roy, and Jaynie F. Yang. "Changes in Locomotor Muscle Activity After Treadmill Training in Subjects With Incomplete Spinal Cord Injury." Journal of Neurophysiology 101, no. 2 (2009): 969–79. http://dx.doi.org/10.1152/jn.91131.2008.

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Intensive treadmill training after incomplete spinal cord injury can improve functional walking abilities. To determine the changes in muscle activation patterns that are associated with improvements in walking, we measured the electromyography (EMG) of leg muscles in 17 individuals with incomplete spinal cord injury during similar walking conditions both before and after training. Specific differences were observed between subjects that eventually gained functional improvements in overground walking (responders), compared with subjects where treadmill training was ineffective (nonresponders).

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af Klint, R., N. J. Cronin, M. Ishikawa, T. Sinkjaer, and M. J. Grey. "Afferent Contribution to Locomotor Muscle Activity During Unconstrained Overground Human Walking: An Analysis of Triceps Surae Muscle Fascicles." Journal of Neurophysiology 103, no. 3 (2010): 1262–74. http://dx.doi.org/10.1152/jn.00852.2009.

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Plantar flexor series elasticity can be used to dissociate muscle–fascicle and muscle–tendon behavior and thus afferent feedback during human walking. We used electromyography (EMG) and high-speed ultrasonography concomitantly to monitor muscle activity and muscle fascicle behavior in 19 healthy volunteers as they walked across a platform. On random trials, the platform was dropped (8 cm, 0.9 g acceleration) or held at a small inclination (up to ±3° in the parasagittal plane) with respect to level ground. Dropping the platform in the mid and late phases of stance produced a depression in the s

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Loirat, Marie-Jeanne, Brigitte Lucas-Heron, Béatrice Ollivier, and Claude Leoty. "Calcium binding protein changes of sarcoplasmic reticulum from rat denervated skeletal muscle." Bioscience Reports 8, no. 4 (1988): 369–78. http://dx.doi.org/10.1007/bf01115228.

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Two Ca2+ sequestering proteins were studied in fast-twitch (EDL) and slow-twitch (soleus) muscle sarcoplasmic reticulum (SR) as a function of denervation time. Ca2+-ATPase activity measured in SR fractions of normal soleus represented 5% of that measure in SR fractions of normal EDL. Denervation caused a severe decrease in activity only in fast-twich muscle. Ca2+-ATPase and calsequestrin contents were affected differently by denervation. In EDL SR, Ca2+-ATPase content decreased progressively, whereas in soleus SR, no variation was observed. Calsequestrin showed a slight increase in both muscle

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Falduto, M. T., A. P. Young, G. Smyrniotis, and R. C. Hickson. "Reduction of glutamine synthetase mRNA in hypertrophied skeletal muscle." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 262, no. 6 (1992): R1131—R1136. http://dx.doi.org/10.1152/ajpregu.1992.262.6.r1131.

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Skeletal muscle glutamine synthetase (GS) expression is reduced by endurance exercise and is increased when normal innervation is interrupted. This investigation was undertaken to determine whether GS expression is downregulated by the increased contractile activity associated with functional overload. Plantaris muscles overloaded for 30 days by synergist ablation were 70% heavier than those in sham-operated and unoperated control muscles. GS mRNA levels from hypertrophied muscles, measured by Northern and dot-blot hybridization, were reduced to 30% of controls. Changes in total RNA concentrat

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Juel, Carsten. "Na+-K+-ATPase in rat skeletal muscle: muscle fiber-specific differences in exercise-induced changes in ion affinity and maximal activity." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 296, no. 1 (2009): R125—R132. http://dx.doi.org/10.1152/ajpregu.90760.2008.

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It is unclear whether muscle activity reduces or increases Na+-K+-ATPase maximal in vitro activity in rat skeletal muscle, and it is not known whether muscle activity changes the Na+-K+-ATPase ion affinity. The present study uses quantification of ATP hydrolysis to characterize muscle fiber type-specific changes in Na+-K+-ATPase activity in sarcolemmal membranes and in total membranes obtained from control rats and after 30 min of treadmill running. ATPase activity was measured at Na+ concentrations of 0–80 mM and K+ concentrations of 0–10 mM. Km and Vmax values were obtained from a Hill plot.

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Čuj, Jakub, Miloslav Gajdoš, Pavol Nechvátal, Cyril Grus, Michal Macej, and Lucia Demjanovič Kendrová. "Changes in muscle activity of selected muscles during walking in high-heeled shoes on a treadmill." Physical Activity Review 13, no. 1 (2025): 14–25. https://doi.org/10.16926/par.2025.13.02.

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The aim of the study was to investigate how walking in high heels on a treadmill affects the changes in timing of activation in selected lower limb muscles, pelvic muscles, and upper trunk muscles in young women. Surface electromyography (EMG) was used for data collection of selected muscles on the right half of the body: m. pectoralis major, m. trapezius pars transversa, m. obliquus abdominis externus, m. erector spinae in the lumbar spine, m. gluteus medius, m. gluteus maximus, m. rectus femoris, m. biceps femoris-caput longum. The research group consisted of 30 women (age: 24.2 ± 2.3 years;

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Erdem, Abdulvahit, Nihat Kilic, and Barçin Eröz. "Changes in soft tissue profile and electromyographic activity after activator treatment." Australasian Orthodontic Journal 25, no. 2 (2009): 116–22. http://dx.doi.org/10.2478/aoj-2009-0017.

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Abstract Background To date, few studies have correlated the changes in muscle activity and specific soft tissue variables in adolescents with malocclusions. Objective To determine associations between the soft tissue profile and electromyographic activities in temporalis, masseter and orbicularis oris muscles in children with Class II division 1 malocclusions treated with activators. Methods For this prospective study, 25 subjects with Class II division 1 malocclusions were randomly assigned to either a Treatment group (N = 15) or a Control group (N = 10). The mean skeletal ages of the subjec

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Khutorskaya, I. А., G. F. Shaymardanova, V. P. Balashov, et al. "Morphology of skeletal muscles under dynamic exercise and correction with L-carnitine." CLINICAL AND EXPERIMENTAL MORPHOLOGY 13, no. 4 (2024): 67–75. http://dx.doi.org/10.31088/cem2024.13.4.67-75.

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Introduction. There is paucity of information on morphological changes in skeletal muscle tissue under dynamic exercise. Data on myoprotective properties of L-carnitine are contradictory. The paper aimed to analyze ultrastructural changes in characteristic multinucleated structures of the soleus and plantaris muscles of rats under intense physical activity and the action of L-carnitine. Materials and methods. The animals were divided into three groups: 1) the control group, in which the rats that did not have physical activity; 2) the comparison group, where the rats had intense physical activ

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Aoki, Osamu, Yoshitaka Otani, and Shinichiro Morishita. "Immediate changes in anticipatory muscle activity after unexpected muscle contraction training." Translational Sports Medicine 3, no. 6 (2020): 574–80. http://dx.doi.org/10.1002/tsm2.168.

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Marshall, Paul, and Bernadette Murphy. "Changes in muscle activity and perceived exertion during exercises performed on a swiss ball." Applied Physiology, Nutrition, and Metabolism 31, no. 4 (2006): 376–83. http://dx.doi.org/10.1139/h06-006.

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The objective of this study was to determine differences in electromyographic (EMG) activity of prime mover and abdominal muscles while performing squats, push ups, and double leg lowering with a swiss ball. Twelve healthy subjects performed the movements. There was no difference between the surface conditions for muscle activity during the squat exercise; however, individuals had lower perceived exertion for the swiss ball squat. Activity of the triceps and abdominals was highest performing push ups on the swiss ball, whereas the activity of rectus abdominus (RA) only increased during double

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McMulkin, Mark L. "Predicted Muscular Activity for Varying Inputs to Optimization-Based Biomechanical Trunk Models." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 39, no. 10 (1995): 615–19. http://dx.doi.org/10.1177/154193129503901016.

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The Minimum Intensity Compression (MIC) model developed by Bean, Chaffin, and Schultz (1988) and the Sum of the Cubed Intensities (SCI) model developed by Crowninshield and Brand (1981) have been used to predict trunk muscle forces during external loads. The models require muscle geometries (moment arms, lines of action, and cross-sectional areas) as inputs. This paper reports on a computer simulation conducted to evaluate the changes in trunk muscle forces predicted by the MIC and SCI models with changes in inputs. Two muscle geometries were used for a 10-muscle set one reported by Han, Ann,

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Abuwarda, Khaled, and Abdel-Rahman Akl. "Changes in Electromyographic Activity of the Dominant Arm Muscles during Forehand Stroke Phases in Wheelchair Tennis." Sensors 23, no. 20 (2023): 8623. http://dx.doi.org/10.3390/s23208623.

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The aim of this study was to determine the muscle activations of the dominant arm during the forehand stroke of wheelchair tennis. Five players participated in the present study (age: 32.6 ± 9.9 years; body mass: 63.8 ± 3.12 kg; height: 164.4 ± 1.7 cm). The electrical muscle activity of six dominant arm muscles was recorded using an sEMG system. A significant effect of the muscle’s activity was observed, and it was shown that the muscle activation was significantly higher in the execution phase compared to the preparation phase in the anterior deltoid and biceps brachii (34.98 ± 10.23% and 29.

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Wainwright, P. C. "Motor correlates of learning behaviour: feeding on novel prey by pumpkinseed sunfish (Lepomis gibbosus)." Journal of Experimental Biology 126, no. 1 (1986): 237–47. http://dx.doi.org/10.1242/jeb.126.1.237.

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The functional basis of learning in prey capture was investigated in the pumpkinseed sunfish (Lepomis gibbosus). Feeding performance of sunfishes was assessed when the fish were first fed a novel, elusive prey (guppies) and compared with their performance after several weeks of experience with capturing guppies. During these feedings electromyographic recordings were made to document the pattern of activity in four jaw muscles at the strike. With experience, the L. gibbosus improved their ability to capture guppies, and several changes in the pattern of muscle activity were associated with thi

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Bolser, D. C., B. G. Lindsey, and R. Shannon. "Respiratory pattern changes produced by intercostal muscle/rib vibration." Journal of Applied Physiology 64, no. 6 (1988): 2458–62. http://dx.doi.org/10.1152/jappl.1988.64.6.2458.

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Large-amplitude vibration of the intercostal muscles/ribs has an inhibitory effect on inspiratory motor output. This effect has been attributed, in part, to the stimulation of intercostal muscle tendon organs. Intercostal muscle/rib vibration can also produce a decrease or increase in respiratory frequency. Studies were conducted 1) to determine whether, in addition to intercostal tendon organs, costovertebral joint mechanoreceptors (CVJR's) contribute to the inspiratory inhibitory effect of intercostal muscle/rib vibration (IMV) and 2) to explain the different respiratory frequency responses

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Hani Nur Endah, Heni Sumarti, and Hamdan Hadi Kusuma. "Perbandingan Aktivasi Otot Trisep pada Kondisi Kontraksi dan Relaksasi Menggunakan Elektromiografi (EMG) Portabel Berbasis Android." Polygon : Jurnal Ilmu Komputer dan Ilmu Pengetahuan Alam 2, no. 5 (2024): 80–91. http://dx.doi.org/10.62383/polygon.v2i5.234.

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EMG is a method widely used to estimate muscle activity and can help understand how muscles interact with each other that affects human movement control. In this study to detect muscle interaction during contraction and relaxation of the triceps elbow muscle. Non-invasive techniques are used in this study to characterize muscle electrical activity. In this study, additional loads were added to the contraction movement to observe whether there was a relationship between changes in muscle activity and the load carried by the muscle in male and female subjects. Signal changes can be read by the m

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ELSON, ROBERT, and HANS-JOACHIM PFLÜGER. "The Activity of a Steering Muscle in Flying Locusts." Journal of Experimental Biology 120, no. 1 (1986): 421–41. http://dx.doi.org/10.1242/jeb.120.1.421.

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1. The pleuroaxillary muscle of a forewing (M85) or hindwing (M114) in the locust is supplied by two motor neurones. Each of the two motor neurones innervates a different part of the muscle. Single impulses in these motor neurones produce small twitches in the muscle which tetanize at about 30 Hz. At the wingbeat frequency they show considerable tonic tension upon which ripples are superimposed, 1:1 for each stimulus pulse. 2. During sustained, straight, tethered flight, the motor neurones spike rhythmically, producing one (leas often two) spike(s) per wingbeat in the first half of each downst

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Wainwright, P., and B. Richard. "Scaling the feeding mechanism of the largemouth bass (Micropterus salmoides): motor pattern." Journal of Experimental Biology 198, no. 5 (1995): 1161–71. http://dx.doi.org/10.1242/jeb.198.5.1161.

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We present the first analysis of scaling effects on the motor pattern of a feeding vertebrate. Data are presented for the effects of body size on the pattern of activity in four head muscles during prey capture in the largemouth bass, Micropterus salmoides. Electromyographic (EMG) recordings were made from three expansive-phase muscles (the epaxialis, the sternohyoideus and the levator arcus palatini) and one compressive-phase muscle (the adductor mandibulae), during the capture of small fish prey. Recordings were made of 181 prey-capture events from 19 bass that ranged in size from 83 to 289

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Boyer, Katherine A., and Benno M. Nigg. "Changes in Muscle Activity in Response to Different Impact Forces Affect Soft Tissue Compartment Mechanical Properties." Journal of Biomechanical Engineering 129, no. 4 (2006): 594–602. http://dx.doi.org/10.1115/1.2746384.

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Electromyographic (EMG) activity is associated with several tasks prior to landing in walking and running including positioning the leg, developing joint stiffness and possibly control of soft tissue compartment vibrations. The concept of muscle tuning suggests one reason for changes in muscle activity pattern in response to small changes in impact conditions, if the frequency content of the impact is close to the natural frequency of the soft tissue compartments, is to minimize the magnitude of soft tissue compartment vibrations. The mechanical properties of the soft tissue compartments depen

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