The effect of muscle fatigue on stimulus intensity requirements for central and peripheral fatigue quantification.

Abstract:

PURPOSE:The present study was designed to determine the stimulation intensity necessary for an adequate assessment of central and peripheral components of neuromuscular fatigue of the knee extensors. METHODS:Three different stimulation intensities (100, 120 and 150% of the lowest intensity evoking a plateau in M-waves and twitch amplitudes, optimal stimulation intensity, OSI) were used to assess voluntary activation level (VAL) as well as M-wave, twitch and doublet amplitudes before, during and after an incremental isometric exercise performed by 14 (8 men) healthy and physically active volunteers. A visual analog scale was used to evaluate the associated discomfort. RESULTS:There was no difference (p > 0.05) in VAL between the three intensities before and after exercise. However, we found that stimulating at 100% OSI may overestimate the extent of peripheral fatigue during exercise, whereas 150% OSI stimulations led to greater discomfort associated with doublet stimulations as well as to an increased antagonist co-activation compared to 100% OSI. CONCLUSION:We recommend using 120% OSI, as it constitutes a good trade-off between discomfort and reliable measurements.

journal_name

Eur J Appl Physiol

authors

Neyroud D,Vallotton A,Millet GY,Kayser B,Place N

doi

10.1007/s00421-013-2760-2

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

205-15

issue

1

eissn

1439-6319

issn

1439-6327

journal_volume

114

pub_type

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