Water immersion delays the oxygen uptake response to sitting arm-cranking in humans

Naoyuki Hayashi*, Takayoshi Yoshida


研究成果: Article査読

3 被引用数 (Scopus)


We investigated the effect of central hypervolaemia during water immersion up to the xiphoid process on the oxygen uptake (V̇O2) and heart rate (HR) response to arm cranking. Seven men performed a 6-min arm-cranking exercise at an intensity requiring a V̇O2 at 80% ventilatory threshold both in air [C trial, 29 (SD 9) W] and immersed in water [WI trial, 29 (SD 11) W] after 6 min of sitting. The V̇O2 (phase 2) and HR responses to exercise were obtained from a mono-exponential fit [f(t) = baseline + gain·(1 - e(-(t-TD)/Υ))]. The response was evaluated by the mean response time [MRT; sum of time constant (Υ) and time delay (TD)]. No significant difference in V̇O2 and HR gains between the C and WI trials was observed [V̇O2 0.78 (SD 0.1) vs 0.80 (SD 0.2) 1·min-1, HR 36 (SD 7) vs 37 (SD 8) beats·min-1, respectively]. Although the HR MRT was not significantly different between the C and WI trials [17 (SD 3), 19 (SD 8) s, respectively), V̇O2 MRT was greater in the WI trial than in the C trial [40 (SD 6), 45 (SD 6) s, respectively; P < 0.05]. Assuming no difference in V̇O2 in active muscle between the two trials, these results would indicate that an increased oxygen store and/or an altered response in muscle blood distribution delayed the V̇O2 response to exercise.

ジャーナルEuropean Journal of Applied Physiology and Occupational Physiology
出版ステータスPublished - 1999 7月

ASJC Scopus subject areas

  • 生理学
  • 公衆衛生学、環境および労働衛生


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