Cardiovascular responses at the onset of passive leg cycle exercise in paraplegics with spinal cord injury

Satoshi Muraki, Yoshito Ehara, Masahiro Yamasaki

研究成果: ジャーナルへの寄稿学術誌査読

27 被引用数 (Scopus)

抄録

The purpose of this study was to examine the cardiovascular responses at the onset of passive leg cycle exercise (PLCE) in paraplegics with spinal cord injury (PSCI) to investigate the increase in venous return from the paralyzed lower limbs during PLCE. Six male PSCI having lesions at levels ranging from T8 to L1 and five male able-bodied subjects (ABS) participated in this study. The subjects performed PLCE at pedalling frequencies of 40 rpm for 6 min. Cardiac output (Q(c)), stroke volume (SV) and heart rate (f(c)) were measured before and during PLCE. In the steady state (4th and 5th min) of PLCE, both PSCI and ABS showed a significant increase in Q(c). At the onset of PLCE, however, clear differences in the cardiovascular response were found between PSCI and ABS. The ABS showed a rapid and marked increase in f(c) and consequently Q(c) within 20 s of the onset of PLCE. On the other hand, in PSCI, the Q(c) increased more slowly, compared with that in ABS, because of a smaller increase in f(c) and a delayed increase in SV. The observed delay in the increases of Q(c) and SV at the onset of PLCE in PSCI was presumably due to the absence of afferent reflexes from the lower limbs, and to the additional time needed for venous return to arrive at the heart from the passively moved muscles.

本文言語英語
ページ(範囲)271-274
ページ数4
ジャーナルEuropean Journal of Applied Physiology
81
4
DOI
出版ステータス出版済み - 3月 2000
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 整形外科およびスポーツ医学
  • 公衆衛生学、環境および労働衛生
  • 生理学(医学)

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