Age and gender moderate the effects of localized muscle fatigue on lower extremity joint torques used during quiet stance

Wojcik, Laura A.; Nussbaum, Maury A.; Lin, Dingding; Shibata, Peggy; Madigan, Michael L.

doi:10.1016/j.humov.2010.03.008

Cited by 22 publications

(12 citation statements)

References 42 publications

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“…In conclusion, this study showed that application of WBV to chronic stroke patients was not helpful for improving their immediate balance ability. The adverse effects of WBV have been reported in previous studies 24 , 34 , 35 , 36 , 37 , 38 ) . However, some studies have reported positive effects 16 , 39 , 40 , 41 , 42 , 43 ) .…”

Section: Discussionsupporting

confidence: 51%

Whole body vibration may have immediate adverse effects on the postural sway of stroke patients

Hwang

Ryu

2016

J Phys Ther Sci

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[Purpose] This study applied whole body vibration (WBV) at different vibration frequencies to chronic stroke patients and examined its immediate effect on their postural sway. [Subjects and Methods] A total of 14 (5 males, 9 females) stroke patients participated. The subjects were randomly assigned to one of the two vibration frequency groups (10 Hz and 40 Hz). Right before and after the application of WBV, the subjects performed quiet standing for 30 seconds, and COP parameters (range, total distance, and mean velocity) were analyzed. [Results] The 10 Hz WBV did not affect the postural sway of stroke patients. The 40 Hz WBV increased postural sway in the ML direction. [Conclusion] The results suggest that WBV application to stroke patients in the clinical field may have adverse effects and therefore caution is necessary.

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Section: Discussionsupporting

confidence: 51%

Whole body vibration may have immediate adverse effects on the postural sway of stroke patients

Hwang

Ryu

2016

J Phys Ther Sci

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“…Interpretation of the SDA may offer more insight into the nature of the process controlling the CoP trajectories and may be more sensitive than traditional CoP measures. Previous research groups have shown that SDA parameters are sensitive to the effects of fatigue [16], [68]. However, one limitation of SDA is the underestimation of long-term correlations (second slope of SDA) and the fact that the assessment, at the individual level, is based on poorly defined diffusion plots due to an evident contamination by low-frequency oscillatory components [59].…”

Section: Discussionmentioning

confidence: 99%

Alterations in Postural Control during the World's Most Challenging Mountain Ultra-Marathon

et al. 2014

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We investigated postural control (PC) effects of a mountain ultra-marathon (MUM): a 330-km trail run with 24000 m of positive and negative change in elevation. PC was assessed prior to (PRE), during (MID) and after (POST) the MUM in experienced ultra-marathon runners (n = 18; finish time = 126±16 h) and in a control group (n = 8) with a similar level of sleep deprivation. Subjects were instructed to stand upright on a posturographic platform over a period of 51.2 seconds using a double-leg stance under two test conditions: eyes open (EO) and eyes closed (EC). Traditional measures of postural stability (center of pressure trajectory analysis) and stabilogram-diffusion analysis (SDA) parameters were analysed. For the SDA, a significantly greater short-term effective diffusion was found at POST compared with PRE in the medio-lateral (ML; Dxs) and antero-posterior (AP) directions (Dys) in runners (p<0.05) The critical time interval (Ctx) in the ML direction was significantly higher at MID (p<0.001) and POST (p<0.05) than at PRE in runners. At MID (p<0.001) and POST (p<0.05), there was a significant difference between the two groups. The critical displacement (Cdx) in the ML was significantly higher at MID and at POST (p<0.001) compared with PRE for runners. A significant difference in Cdx was observed between groups in EO at MID (p<0.05) and POST (p<0.005) in the ML direction and in EC at POST in the ML and AP directions (p<0.05).Our findings revealed significant effects of fatigue on PC in runners, including, a significant increase in Ctx (critical time in ML plan) in EO and EC conditions. Thus, runners take longer to stabilise their body at POST than at MID. It is likely that the mountainous characteristics of MUM (unstable ground, primarily uphill/downhill running, and altitude) increase this fatigue, leading to difficulty in maintaining balance.

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“…Thigh (r=0.248; p<0.05) and foot ankle (r=0.282; p<0.05) shows the strong correlation between the different age of the workers. This proves age influences on muscle fatigue and this may result mainly from high-force exertion tasks, which are associated with different mechanisms of fatigue [11]. Besides that, shrinkage of muscles in term of size and density, causing the reduction in muscles strength when getting old [12].…”

Section: Perception Of Cause Discomfort Pain and Fatiguementioning

confidence: 99%

Perception on Prolonged Standing Work in Electronic Manufacturing Company

Mohamad¹,

Rohani²,

Rahman³

et al. 2018

IJET

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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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Age and gender moderate the effects of localized muscle fatigue on lower extremity joint torques used during quiet stance

Cited by 22 publications

References 42 publications

Whole body vibration may have immediate adverse effects on the postural sway of stroke patients

Whole body vibration may have immediate adverse effects on the postural sway of stroke patients

Alterations in Postural Control during the World's Most Challenging Mountain Ultra-Marathon

Perception on Prolonged Standing Work in Electronic Manufacturing Company

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