NDLI: Mechanomyographic and electromyographic responses during fatigue in humans: influence of muscle length

Content Provider	Springer Nature Link
Author	Weir, Joseph P. Ayers, Kristi M. Lacefield, Jennifer F. Walsh, Kara L.
Copyright Year	2000
Abstract	Mechanomyography (MMG) provides a measure of muscle mechanical changes during contractions. The purpose of this study was to quantify alterations in MMG signals during fatigue at two muscle lengths. Comparisons with electromyographic (EMG) recordings were made. A group of 13 subjects performed isometric dorsiflexions (50% of maximum for 60 s) at 40° of plantarflexion (long, l l) and 5° of dorsiflexion (short, l s). The mean power frequency of the EMG (f¯ EMG) and MMG (f¯ MMG) signals and the mean rectified MMG ( ) and EMG ( ) were determined over each 1-s period, normalized to the respective maximal value, regressed against time, and the resulting slopes (units = %max · s−1) were analyzed. The slopes were larger (P = 0.007) at l l compared to l s [mean l l 0.50 (SD 0.26), mean l s 0.27 (SD 0.16)], however there were no differences (P = 0.24) between mean f¯ MMG slopes [l l−0.10 (SD 0.16), l s−0.16 (SD 0.11)]. Similarly, slopes were larger (P = 0.001) at l l versus l s [l l 0.26 (SD 0.13), l s 0.08 (SD 0.15)] and there were no differences (P=0.89) between mean f¯ EMG slopes [l l−0.15 (SD 0.14), l s−0.14 (SD 0.12)]. At 5 s following the exercise to fatigue mean MVC (units = %max) were not significantly different between l l and l s [P = 0.08; l l 78.8 (SD 9.1), l s 85.2 (SD 6.0)]. These results showed that during fatiguing contractions, MMG and EMG amplitudes increased while frequency characteristics decreased at both muscle lengths. The change in and was greater at l l but no differences in f¯ MMG or f¯ EMG slopes occurred between lengths. These results would suggest that larger increases in motor unit recruitment occur with time during fatigue at l l compared to l s.
Starting Page	352
Ending Page	359
Page Count	8
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	81
Issue Number	4
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-01-18
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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