Journal article
Effects of fatigue and sprint training on electromechanical delay of knee extensor muscles
European Journal of Applied Physiology and Occupational Physiology, Vol.72(5-6), pp.410-416
1996
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Source: InCites
Abstract
<p>Electromechanical delay (EMD) of knee extensors in isometric contraction was investigated in six healthy men before and after four periods of 30-s allout sprint cycling exercise, conducted pre and post a 7-week sprint cycling training programme. The EMD was lengthened from 40.4 (SEM 3.46) ms at rest to 63.4 (SEM 7.80) ms after the fatiguing exercise (P < or = 0.05) in the pre-training test. During maximal voluntary contractions (MVC) conducted after the fatiguing exercise, the peak contraction force (Fpeak) and peak rate of force development (RFDpeak) were reduced by 51%-56% and 38%-50%, respectively (both P < or = 0.05). The mechanisms of EMD lengthening during fatigue could have been due to the deterioration in muscle conductive, contractile or elastic properties and require further study. The training programme increased the total work performed during the four periods of sprint exercise (P < or = 0.05). However, no significant training effects were found in the resting or postexercise EMD, Fpeak and RFDpeak during isometric MVC. These unchanged isometric contraction variables but enhanced dynamic performance suggest that isometric tests of muscle are insensitive to the neuromuscular adaptations to sprint training.</p>
Details
- Title
- Effects of fatigue and sprint training on electromechanical delay of knee extensor muscles
- Creators
- Shi Zhou - Southern Cross UniversityMichael J McKenna - Victoria UniversityDavid L Lawson - Victoria UniversityWilliam E Morrison - Victoria UniversityIan Fairweather - Victoria University
- Publication Details
- European Journal of Applied Physiology and Occupational Physiology, Vol.72(5-6), pp.410-416
- Identifiers
- 1451; 991012821684102368
- Academic Unit
- Human Sciences; Faculty of Health; School of Health and Human Sciences
- Resource Type
- Journal article