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

Naoyuki Hayashi; Takayoshi Yoshida

doi:10.1007/s004210050569

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

Naoyuki Hayashi^*, Takayoshi Yoshida

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	132-138
Number of pages	7
Journal	European Journal of Applied Physiology and Occupational Physiology
Volume	80
Issue number	2
DOIs	https://doi.org/10.1007/s004210050569
Publication status	Published - 1999 Jul
Externally published	Yes

Keywords

Cardiac output
Central hypervolaemia
Heart rate
Oxygen store
Oxygen uptake kinetics

ASJC Scopus subject areas

Physiology
Public Health, Environmental and Occupational Health

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1007/s004210050569

Cite this

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title = "Water immersion delays the oxygen uptake response to sitting arm-cranking in humans",

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)/Υ))]. The response was evaluated by the mean response time [MRT; sum of time constant (Υ) 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) 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), {\.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.",

keywords = "Cardiac output, Central hypervolaemia, Heart rate, Oxygen store, Oxygen uptake kinetics",

author = "Naoyuki Hayashi and Takayoshi Yoshida",

year = "1999",

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doi = "10.1007/s004210050569",

language = "English",

volume = "80",

pages = "132--138",

journal = "European Journal of Applied Physiology and Occupational Physiology",

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TY - JOUR

T1 - Water immersion delays the oxygen uptake response to sitting arm-cranking in humans

AU - Hayashi, Naoyuki

AU - Yoshida, Takayoshi

PY - 1999/7

Y1 - 1999/7

N2 - 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.

AB - 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.

KW - Cardiac output

KW - Central hypervolaemia

KW - Heart rate

KW - Oxygen store

KW - Oxygen uptake kinetics

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JF - European Journal of Applied Physiology and Occupational Physiology

IS - 2

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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