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Author Hayashi, Naoyuki ♦ Yoshida, Takayoshi
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©1999
Language English
Subject Domain (in DDC) Social sciences ♦ Sociology & anthropology
Abstract We investigated the effect of central hypervolaemia during water immersion up to the xiphoid process on the oxygen uptake (V˙O2) and heart rate (HR) response to arm cranking. Seven men performed a 6-min arm-cranking exercise at an intensity requiring a V˙O2 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 V˙O2 (phase 2) and HR responses to exercise were obtained from a mono-exponential fit [f(t)=baseline+gain·(1−e−( t − TD )/)]. The response was evaluated by the mean response time [MRT; sum of time constant () and time delay (TD)]. No significant difference in V˙O2 and HR gains between the C and WI trials was observed [V˙O2 0.78 (SD 0.1) vs 0.80 (SD 0.2) l · 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), V˙O2 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 V˙O2 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 V˙O2 response to exercise.
ISSN 03015548
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 1999-06-08
Publisher Place Berlin/Heidelberg
e-ISSN 14396327
Journal European Journal of Applied Physiology
Volume Number 80
Issue Number 2
Page Count 7
Starting Page 132
Ending Page 138

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Source: SpringerLink