Long-Lasting Changes in Muscle Twitch Force During Simulated Work While Standing or Walking

2016 ◽  
Vol 58 (8) ◽  
pp. 1117-1127 ◽  
Author(s):  
Maria-Gabriela Garcia ◽  
Rudolf Wall ◽  
Benjamin Steinhilber ◽  
Thomas Läubli ◽  
Bernard J. Martin
Keyword(s):  
Muscle Function ◽  
Signal Amplitude ◽  
Lower Leg ◽  
Muscle Twitch ◽  
Prolonged Standing ◽  
Twitch Force ◽  
Slow Pace ◽  
Leg Muscles ◽  
Ergonomic Interventions ◽  
Hard Floor

Objective: The aim of this study was to evaluate the long-lasting effects of prolonged standing work on a hard floor or floor mat and slow-pace walking on muscle twitch force (MTF) elicited by electrical stimulation. Background: Prolonged standing work may alter lower-leg muscle function, which can be quantified by changes in the MTF amplitude and duration related to muscle fatigue. Ergonomic interventions have been proposed to mitigate fatigue and discomfort; however, their influences remain controversial. Method: Ten men and eight women simulated standing work in 320-min experiments with three conditions: standing on a hard floor or an antifatigue mat and walking on a treadmill, each including three seated rest breaks. MTF in the gastrocnemius-soleus muscles was evaluated through changes in signal amplitude and duration. Results: The significant decrease of MTF amplitude and an increase of duration after standing work on a hard floor and on a mat persisted beyond 1 hr postwork. During walking, significant MTF metrics changes appeared 30 min postwork. MTF amplitude decrease was not significant after the first 110 min in any of the conditions; however, MTF duration was significantly higher than baseline in the standing conditions. Conclusion: Similar long-lasting weakening of MTF was induced by standing on a hard floor and on an antifatigue mat. However, walking partially attenuated this phenomenon. Application: Mostly static standing is likely to contribute to alterations of MTF in lower-leg muscles and potentially to musculoskeletal disorders regardless of the flooring characteristics. Occupational activities including slow-pace walking may reduce such deterioration in muscle function.

scholarly journals Comparison of Physiological Effects Induced by Two Compression Stockings and Regular Socks During Prolonged Standing Work

2021 ◽  
pp. 001872082110221
Author(s):  
Maria-Gabriela Garcia ◽  
Maria Gloria Roman ◽  
Andrea Davila ◽  
Bernard J. Martin
Keyword(s):  
Muscle Fatigue ◽  
Lower Leg ◽  
Healthy Individuals ◽  
Compression Stockings ◽  
Muscle Twitch ◽  
Prolonged Standing ◽  
Quantitative Evidence ◽  
Before And After ◽  
Leg Muscle ◽  
Force Volume

Objective The goal of this study was to evaluate and compare lower-leg muscle fatigue, edema, and discomfort induced by the prolonged standing of security guards wearing regular socks and those wearing 15–20 or 20–30 mmHg compression stockings as intervention. Background Compression stockings are somewhat used by individuals standing all day at work. However, quantitative evidence showing their potential benefits for lower-leg health issues in healthy individuals during real working conditions is lacking. Method Forty male security employees participated in the study. All were randomly assigned to the control or one of the two intervention groups (I15–20 or I20–30). Lower-leg muscle twitch force, volume, and discomfort ratings were measured before and after their regular 12-hr standing work shift. Results Significant evidence of lower-leg long-lasting muscle fatigue, edema, and discomfort was observed after standing work for guards wearing regular socks. However, no significant changes were found for guards wearing either compression stockings. Conclusion In healthy individuals, compression stockings seem to attenuate efficiently the tested outcomes in the lower leg resulting from prolonged standing. Application Occupational activities requiring prolonged standing may benefit from 15–20 or 20–30 mmHg compression stockings. As similar benefits were observed for both levels of compression, the lower level may be sufficient.

Muscular and Vascular Issues Induced by Prolonged Standing With Different Work–Rest Cycles With Active or Passive Breaks

2018 ◽  
Vol 60 (6) ◽  
pp. 806-821 ◽  
Author(s):  
Maria-Gabriela Garcia ◽  
Thomas Läubli ◽  
Bernard J. Martin
Keyword(s):  
Muscle Fatigue ◽  
Postural Stability ◽  
Detrimental Effect ◽  
Lower Leg ◽  
Muscle Twitch ◽  
Prolonged Standing ◽  
Rest Periods ◽  
Occupational Activities ◽  
Rest Breaks ◽  
Active Breaks

Objective: The aim of this study was to evaluate the long-lasting motor, behavioral, physiological, and perceptual effects of prolonged standing work in three work–rest cycle conditions including passive or active rest breaks. Background: Muscle fatigue has been evidenced after prolonged standing work through physiological and neuromotor measures. It has been postulated that muscle fatigue induced by prolonged work could be attenuated by appropriate scheduling of work and rest periods. However, investigations in this domain remain limited. Method: Thirty participants simulated standing work for 5 hr with work–rest cycles of short, medium, or long standing periods including passive or active breaks. Lower-leg muscle twitch force (MTF), muscle oxygenation, lower-leg volume, postural stability, force control, and discomfort perception were quantified on 2 days. Results: Prolonged standing induced significant changes in all measures immediately after 5 hr of work, indicating a detrimental effect in long-lasting muscle fatigue, performance, discomfort, and vascular aspects. Differences in the measures were not significant between work cycles and/or break type. Conclusion: Similar physiological and motor alterations were induced by prolonged standing. The absence of difference in the effects induced by the tested work–rest cycles suggests that simply altering the work–rest cycle may not be sufficient to counteract the effects of mainly static standing work. Finally, standing for 3 hr or more shows clear detrimental effects. Application: Prolonged standing is likely to contribute to musculoskeletal and vascular symptoms. A limitation to less than 3 hr of mostly static standing in occupational activities could avoid alterations leading to these symptoms.

Asymmetrical Neural Adaptation in Lower Leg Muscles as a Consequence of Stereotypical Motor Training

2012 ◽  
Vol 44 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Tetsuya Ogawa ◽  
Noritaka Kawashima ◽  
Shuji Suzuki ◽  
Kimitaka Nakazawa
Keyword(s):  
Lower Leg ◽  
Neural Adaptation ◽  
Motor Training ◽  
Leg Muscles

Adverse effects of myasthenia gravis on rat phrenic diaphragm contractile performance

2004 ◽  
Vol 97 (3) ◽  
pp. 895-901 ◽  
Author(s):  
Erik van Lunteren ◽  
Michelle Moyer ◽  
Henry J. Kaminski
Keyword(s):  
Myasthenia Gravis ◽  
Muscle Function ◽  
Initial Period ◽  
Neuromuscular Diseases ◽  
Diaphragm Muscle ◽  
Twitch Force ◽  
Continuous Stimulation ◽  
Intermittent Stimulation ◽  
Contractile Performance

Myasthenia gravis has variable effects on the respiratory system, ranging from no abnormalities to life-threatening respiratory failure. Studies characterized diaphragm muscle contractile performance in rat autoimmune myasthenia gravis. Rats received monoclonal antibody that recognizes acetylcholine receptor determinants (or inactive antibody); 3 days later, phrenic nerve and diaphragm were studied in vitro. Myasthenic rats segregated into two groups, those with normal vs. impaired limb muscle function when tested in intact animals (“mild” and “severe” myasthenic). Baseline diaphragm twitch force was reduced for both severe ( P < 0.01) and mild ( P < 0.05) myasthenic compared with control animals (twitch force: normal 1,352 ± 140, mild myasthenic 672 ± 99, severe myasthenic 687 ± 74 g/cm2). However, only severe myasthenic diaphragm had impaired diaphragm endurance, based on significantly ( P < 0.05) accelerated rate of peak force decline during the initial period of stimulation (0.02 + 0.02, 0.03 ± 0.01, and 0.09 ± 0.01%/pulse for normal, mild myasthenic, and severe myasthenic, respectively, during continuous stimulation) and intratrain fatigue (up to 30.5 ± 7.4% intratrain force drop in severe myasthenic vs. none in normal and mild myasthenic, P < 0.01). Furthermore, compared with continuous stimulation, intermittent stimulation had a protective effect on force of severe myasthenic diaphragm (force after 2,000 pulses was 31.4 ± 2.0% of initial during intermittent stimulation vs. 13.0 ± 2.1% of initial during continuous stimulation, P < 0.01) but not on normal diaphragm. These data indicate that baseline force and fatigue may be affected to different extents by varying severity of myasthenia gravis and furthermore provide a mechanism by which alterations in breathing pattern may worsen respiratory muscle function in neuromuscular diseases.

The Relationship Between Dolphin Kick Movement And Underwater EMG Of Lower Leg Muscles In Competitive Swimmers

2016 ◽  
Vol 48 ◽  
pp. 441
Author(s):  
Tadashi Wada ◽  
Noriyuki Yamamoto ◽  
Yoshimitsu Shimoyama ◽  
Yukinoti Shintaku ◽  
Hirofumi Jigami ◽  
...  
Keyword(s):  
Lower Leg ◽  
Leg Muscles ◽  
Dolphin Kick ◽  
The Relationship ◽  
Competitive Swimmers

scholarly journals Perception on Prolonged Standing Work in Electronic Manufacturing Company

2018 ◽  
Vol 7 (3.24) ◽  
pp. 44
Author(s):  
Norlizaa Mohamad ◽  
Jafri Mohd Rohani ◽  
Ismail Abdul Rahman ◽  
Anis Amira Mat Zuki
Keyword(s):  
Good Health ◽  
Body Part ◽  
Health Condition ◽  
The Body ◽  
Body Region ◽  
Body Parts ◽  
Prolonged Standing ◽  
Electronic Manufacturing ◽  
Strong Relation ◽  
Ergonomic Interventions

Prolonged standing is one of the common activities in electronic industry as the task requirement. Prolonged standing can cause discomfort on the body of the workers and can lead to injury and occupational disease. The purpose of this study is to investigate standing workers perception on the fatigue and the discomfort on their respective body region for 12 hours working time. The subjects are the 80 workers with a good health condition and at least 6 months tenure. The subject data are collected via questionnaires and Likert scale to define the discomfort, pain, and fatigue. The workers were interviewed regarding their job and perceived fatigue discomfort. The results show the domination of the lower body region with the higher mean at the lower back, legs, and foot ankle. No statistically significant differences were found between the job tenure and body part discomfort pain and fatigue. There is a significant relation between gender and discomfort pain on legs and foot ankle. The result also shows a strong relation between age and the discomfort body parts of thigh and foot ankle. The perceptions of the workers towards discomfort pain and fatigue cause by prolonged standing during performing the task. The results from this study will provide a view for industrial consultants or ergonomist with evidence to support for ergonomic interventions for prolonged standing activity such as job rotation and work-rest schedule. 

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