児童の水泳時心拍数-酸素摂取量関係におよぼす水温の影響

The Effect of Water Temperature on Heart Rate-Oxygen Uptake Relationship During Swimming in Children

Kurokawa Takashi

デサントスポーツ科学

Oxygen uptake (V̇o2) and heart rate (HR) were measured during submaximal and maximal work in bicycling in air at 25°C and tethered swimming in water at 20, 25 and 32°C, in order to compare the response of HR-V̇o2 relationship in those four conditions. Subject were six boys from 10 to 12 years.

The plot of HR-V̇o2 was linear in all conditions, but shifted significantly to the right in cooler water. At a given submaximal V̇o2, HR in 20°C water was lower by 5.9, 14.7 and 20.0 beats/min than in 25°C water, 32°C water and 25°C air, respectively.

Regression equations for relationships of HR (y) to % V̇o2max (x) were as follows:

water, (20°C) y = 1.09x + 56.8 (r = 0.912)

(25°C) y = 1.25x + 52.7 (r = 0.975)

(32°C) y = 1.21x + 66.7 (r = 0.963)

air, (25°C) y = 1.21x + 73.6 (r = 0.964)

児童の水泳時心拍数(HR)-酸素摂取量(V̇o2)関係に及ぼす水温の影響を検討するために, 気温25℃でのペダリングおよび水温20, 25, 30℃での牽引水泳における最大下および最大作業中にV̇o2とHRを測定した. 被検者は10～12歳の男子児童6名であった.

すべての測定条件において, HRとV̇o2は直線関係を示したが, 直線関係式は水温の低下にともない右方向に有意に偏位した. 一定の最大下V̇o2において, 水温20℃でのHRは水温25℃より5.9拍/分低く, 水温32℃とペダリングよりそれぞれ14.7拍/分, 20.0拍/分低かった.

HR(y)と%V̇o2max(x)との間に次のような推定式が得られた.

水泳: (20℃)y=1.09x+56.8(r=0.912)

(25℃)y=1.25x+52.7(r=0.975)

(32℃)y=1.21x+66.7(r=0.963)

ペダリング: (25℃)y=1.21x+73.6(r=0.964)

Medical sciences [ 490 ]

jpn

デサントスポーツ科学振興財団

[ISSN] 0285-5739

[NCID] AN00357177