期刊
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
卷 114, 期 1, 页码 205-215出版社
SPRINGER
DOI: 10.1007/s00421-013-2760-2
关键词
Interpolated twitch technique; Peripheral fatigue; Isometric contraction; Transcutaneous electrical stimulation
资金
- De Reuter foundation
- Geneva Academic Society
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. 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. 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. We recommend using 120 % OSI, as it constitutes a good trade-off between discomfort and reliable measurements.
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