Kagaya A
Research Institute of Physical Fitness, Japan Women's College of Physical Education, Tokyo.
Eur J Appl Physiol Occup Physiol. 1992;64(4):298-303. doi: 10.1007/BF00636215.
The effects of muscle contraction frequency on blood flow to the calf muscle (Qcalf) 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. The Qcalf 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 mean Qcalf 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 which Qcalf 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.
在六名女性受试者中研究了肌肉收缩频率对小腿肌肉血流量（Qcalf）的影响，她们在仰卧位以20、40、60、80和100次收缩·分钟⁻¹的频率进行动态跖屈。用汞柱橡胶应变片体积描记法测量的Qcalf随着收缩频率的增加而增加，并在60 - 80次收缩·分钟⁻¹时达到峰值。在以60次收缩·分钟⁻¹进行100次跖屈后，平均Qcalf为30.95（标准误4.52）ml·100 ml⁻¹·分钟⁻¹。然而，在特定时间（2分钟或疲劳时）或固定工作量（100次收缩）后，与60次收缩·分钟⁻¹相比，100次收缩·分钟⁻¹时Qcalf显著下降。Qcalf达到峰值的收缩频率取决于运动持续时间。心率在60次收缩·分钟⁻¹时显示出最高平均值，在100次收缩·分钟⁻¹时显著下降。平均血压在100次收缩·分钟⁻¹时低于60次收缩·分钟⁻¹时。通过记录腓肠肌的肌电图测量的收缩之间的舒张期随着频率增加而显著缩短；100次收缩·分钟⁻¹时的平均值为0.14（标准误0.02）秒，相当于收缩时间的35.7%。收缩之间这种缩短的舒张期应该导致在较高收缩频率下运动性充血受到抑制。
