Experimental Physiology
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Experimental Physiology 77.3 pp 505-508
© The Physiological Society 1992
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Experimental Physiology, Vol 77, Issue 3, 505-508
Copyright © 1992 by The Physiological Society

Article

Growth-related change in specific force but not in specific power of rat fast skeletal muscle

A de Haan, CJ de Ruiter, A Lind, and AJ Sargeant

The effect of growth on the dynamic performance of rat medial gastrocnemius muscle was studied. From approximately 1.5 to 5 months of age specific force increased by 18%. Reductions were found in both optimal stimulation frequency (from 120 to 100 Hz) and optimal shortening velocity (by 16%) indicating that the fibres became slower. Specific power did not change during growth but was obtained at a lower shortening velocity. Possible mechanisms for the observed changes are discussed.




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Copyright © 1992 by the The Physiological Society.