caa a22 4500 469055510 CHVBK 20180323132842.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF00636215 doi (NATIONALLICENCE)springer-10.1007/BF00636215 Kagaya Atsuko Research Institute of Physical Fitness, Japan Women's College of Physical Education, 8-19-1 Kitakarasuyama, Setagaya-ku, Tokyo, Japan aut Reduced exercise hyperaemia in calf muscles working at high contraction frequencies [Elektronische Daten] [Atsuko Kagaya] Summary: The effects of muscle contraction frequency on blood flow to the calf muscle (Q calf) were studied in six female subjects, who performed dynamic plantar flexions at frequencies of 20, 40, 60, 80 and 100 contractions · min−1, in a supine position. TheQ calf measured by a mercury-in-rubber strain gauge plethysmograph, increased as contraction frequency increased and reached a peak at 60-80 contractions · min−1. After 100 plantar flexions at 60 contractions · min−1, the meanQ calf was 30.95 (SEM 4.52) ml · 100 ml−1 · min−1. At 100 contractions · min−1, however, it decreased significantly compared with that at 60 contractions · min−1 at a specified time (2 min or exhaustion) or after a fixed amount of work (100 contractions). The contraction frequency at whichQ calf reached a peak depended on the duration of exercise. The heart rate showed its highest mean value at 60 contractions · min−1 and decreased significantly at 100 contractions · min−1. The mean blood pressure was lower at 100 contractions · min−1 than at 60 contractions · min−1. The relaxation period between contractions, measured by recording the electromyogram from the gastrocnemius muscles, shortened markedly as the frequency increased; the mean value at 100 contractions · min−1 was 0.14 (SEM 0.02) s, which corresponded to 35.7% of the contraction time. This shortened relaxation period between contractions should have led to the inhibition of exercise hyperaemia at the higher contraction frequencies. Springer-Verlag, 1992 Contraction frequency nationallicence Calf blood flow nationallicence Relaxation time nationallicence Plantar flexion nationallicence Exercise hyperaemia nationallicence European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/4(1992-07-01), 298-303 0301-5548 64:4<298 1992 64 421 https://doi.org/10.1007/BF00636215 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00636215 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Kagaya Atsuko Research Institute of Physical Fitness, Japan Women's College of Physical Education, 8-19-1 Kitakarasuyama, Setagaya-ku, Tokyo, Japan aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/4(1992-07-01), 298-303 0301-5548 64:4<298 1992 64 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer