The Effect of Muscle Contraction Velocity on Cardiorespiratory Responses to Repetitive Isokinetic Exercise in Humans

Naoyuki Hayashi, Satoshi Koba, Takayoshi Yoshida

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We investigated the effect of muscle contraction velocity on cardiorespiratory responses during exercise. Eight males (23±2 years, 175±5 cm, 64±6 kg, mean±SD) performed 3-min repetitive one-leg extension exercises at various angular velocities (30, 60, 120, and 240 deg/s) with a controlled relaxation interval, relatively constant (duty cycle= 1: 1, A trial) and absolutely constant (relaxation time=0.75 s, B trial) at a total work of 2,100-2,400 J in an isokinetic mode, using a Cybex II dynamometer. We measured heart rate (HR), mean blood pressure (MAP), minute ventilation (V̇E), and oxygen uptake (V̇O2) during the exercise. The angular velocity significantly affected the increase in HR, MAP, V̇E, and V̇O2 at the end of exercise from resting in both A and B trials (e.g., MAP: 12±2, 10±2, 11±2, and 18±2 mmHg in the A trial). The result suggests that muscle contraction velocity affects cardiorespiratory responses during repetitive isokinetic exercise.

Original languageEnglish
Pages (from-to)327-333
Number of pages7
JournalJapanese Journal of Physiology
Volume53
Issue number5
DOIs
Publication statusPublished - 2003 Oct
Externally publishedYes

Keywords

  • Blood pressure
  • Heart rate
  • Isokinetic exercise
  • Muscle contraction velocity

ASJC Scopus subject areas

  • Physiology

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