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Muscle fibre conduction velocity during a 30-s Wingate anaerobic test

Stewart, D. and Farina, D. and Shen, C. and Macaluso, A. (2011) Muscle fibre conduction velocity during a 30-s Wingate anaerobic test. Journal of Electro - myography and Kinesiology, 21 (3). pp. 418-422. ISSN 1050-6411

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Abstract

Ten male volunteers (age 29.2 +/- 5.2 years, mean +/- SD) were recruited to test the hypothesis that muscle fibre conduction velocity (MFCV) would decrease with power output during a 30-s Wingate test on a mechanically-braked cycle ergometer. Prior to the main test, the optimal pre-fixed load corresponding to the highest power output was selected following a random series of six 10-s sprints. Surface electromyographic (EMG) signals were detected from the right vastus lateralis with linear adhesive arrays of eight electrodes. Power output decreased significantly from 6-s until the end of the test (860.9 +/- 207.8 vs. 360.9 +/- 11.4 W, respectively) and was correlated with MFCV (R = 0.543, P < 0.01), which also declined significantly by 26.8 +/- 11% (P < 0.05). There was a tendency for the mean frequency of the EMG power spectrum (MNF) to decrease, but average rectified values (ARV) remained unchanged throughout the test. The parallel decline of MFCV with power output suggests changes in fibre membrane properties. The unaltered ARV, together with the declined MFCV, would indicate either a decrease in discharge rate, de-recruitment of fatigued motor units or elongation of still present motor unit action potentials.

Item type: Article
ID code: 40644
Keywords: surface emg , power output, dynamic contractions, cycling, muscle fatigue, exercise, force, surface EMG, muscle fibre, conduction velocity, 30-s wingate, anaerobic test, Engineering design, Pharmacy and materia medica, Clinical Neurology, Biophysics, Neuroscience (miscellaneous)
Subjects: Technology > Engineering (General). Civil engineering (General) > Engineering design
Medicine > Pharmacy and materia medica
Department: Faculty of Engineering > Design, Manufacture and Engineering Management
Faculty of Engineering > Electronic and Electrical Engineering
Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
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Depositing user: Pure Administrator
Date Deposited: 01 Aug 2012 16:32
Last modified: 27 Mar 2014 10:22
URI: http://strathprints.strath.ac.uk/id/eprint/40644

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