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The influence of stimulation frequency on force‐velocity characteristics of in situ rat medial gastrocnemius muscle
Author(s) -
de Haan A
Publication year - 1998
Publication title -
experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0958-0670
DOI - 10.1113/expphysiol.1998.sp004093
Subject(s) - isometric exercise , stimulation , anatomy , muscle contraction , chemistry , biomedical engineering , materials science , physics , medicine
Force (and power)‐velocity characteristics were determined at different stimulation frequencies in th situ rat muscle with nerve stimulation at 36 degrees C. In isometric contractions (duration, 150 ms), maximal force is generated at approximately 120 Hz. In contrast, in the high velocity (250 mm s‐1) shortening contractions, frequencies of approximately 400 Hz were needed to obtain maximal dynamic force, while 120 Hz elicited only approximately 26% of the maximum. At the highest velocity measured, power production was significantly different (P < 0.05) among frequencies of 80, 120, 200 and 400 Hz, suggesting that maximal shortening velocity should be assessed using very high stimulation frequencies. However, the results further indicate that lower frequencies may be adequate in exercise studies that investigate fatigue and changes in power output during series of repetitive contractions.