Summary
In fourteen subjects we compared maximum voluntary eccentric, concentric, and isometric contractions. The maximum voluntary forces by the subjects on a weight-lifting rod when changing from standing to squatting and from squatting to standing, and during a halfway knee-bend, were measured. The rod was placed on a special stand and moved up and down at a constant speed of 8.5 m/s by a motor. Energy expenditure was measured by the indirect method and EMG activity was measured in the quadriceps femoris. It was found that the force which the muscles generated was greatest during eccentric contraction, lower during isometric and lowest during concentric contraction. Energy expenditure was slightly greater during concentric than eccentric contraction. The level of difference in EMG activity of the quadriceps femoris was statistically insignificant. An energy comparison with isometric contractions was not undertaken in view of the very complex nature of these relationships.
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Seliger, V., Dolejš, L. & Karas, V. A dynamometric comparison of maximum eccentric, concentric, and isometric contractions using EMG and energy expenditure measurements. Europ. J. Appl. Physiol. 45, 235–244 (1980). https://doi.org/10.1007/BF00421331
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DOI: https://doi.org/10.1007/BF00421331