1 0 0 0 OA 運動強度の違いが自転車運動後の下肢における伸張-短縮サイクル遂行機能に及ぼす影響
- 著者
- 高橋 啓悟 白井 祐介 鍋倉 賢治
- 出版者
- 一般社団法人日本体力医学会
- 雑誌
- 体力科学 (ISSN:0039906X)
- 巻号頁・発行日
- vol.69, no.5, pp.371-381, 2020-10-01 (Released:2020-09-16)
- 参考文献数
- 49
This study aimed to elucidate the effects of exercise intensity on stretch-shortening cycle (SSC) function of the lower limbs after cycling. Ten male triathletes performed a cycling graded test to determine the ventilatory threshold (VT) and two hopping-cycling (30 min of cycling at 90 or 110% VT)-hopping tests. The two hopping-cycling-hopping tests performed in random order. Power output (PO), heart rate (HR) and rate of perceived exertion (RPE) were monitored throughout the 30-min cycling. Blood lactate concentrations (BLa) were measured in order to assess metabolic stress. The SSC function was calculated as the ratio of the jump height to the time spent in contact with the ground (reactive strength index [RSI]). PO, HR and RPE values during cycling at 110%VT was higher than at 90%VT (p < 0.01). BLa value after the cycling at 110%VT was higher than at 90%VT (90%VT: 2.4±1.0 vs. 110%VT: 5.9±2.8 mmol/L, p < 0.01). Regardless of the cycling exercise intensity, the RSI significantly decreased after the cycling exercise (p < 0.01). The RSI remained decreased at 15 min after the cycling exercise (p < 0.05). These results demonstrated that the SSC function decreased after cycling. Exercise intensity during cycling is likely to have no effect on the decrease in SSC function.
1 0 0 0 OA ローイング時のストロークレートの相違がエネルギー消費量に及ぼす影響
- 著者
- 白井 祐介 品田 貴恵子 吉岡 利貢 鍋倉 賢治
- 出版者
- 一般社団法人 日本体育学会
- 雑誌
- 体育学研究 (ISSN:04846710)
- 巻号頁・発行日
- vol.59, no.1, pp.263-274, 2014 (Released:2014-06-13)
- 参考文献数
- 30
- 被引用文献数
- 2 1
The aim of this study was to investigate the effect of differences in stroke rate (SR) on energy expenditure during rowing. Oxygen uptake (VO2) was measured under different SR conditions with the same power output. Eight male collegiate rowers (age: 21.6±1.4 yr, height: 171.1±1.8 cm, weight: 68.7±1.9 kg) participated in the study. First, they performed an incremental test on a rowing ergometer to determine power output at the blood lactate threshold (PLT). On other days, they performed 6 different SR trials maintaining their power output at 80% PLT (80% LT test) and 90% PLT (90% LT test), respectively. During the 80% and 90% LT tests, each subject used a triaxial accelerometer sensor placed on the back, and integrals of the absolute value of the accelerometer output from three directions (IAA) were calculated as an index of physical activity level. The most economical SR, at which VO2 was lowest, was found at 80% and 90% LT. In both tests, a higher IAA was observed with increasing SR. Under SR conditions higher than the economical point, there was a significant correlation between the increasing amount of IAA (ΔIAA) and VO2 (ΔVO2) from the economical SR during the 90% LT test (r=0.673, P<0.001). There were strong correlations (r>0.9) between IAA and VO2 in many subjects at a SR higher than the economical point. These results suggest that there is an economical SR point with the same power output during rowing. Additionally, an increasing amount of VO2 associated with IAA at a higher SR than the economical point. This suggests that IAA is useful for estimation of energy expended by the moving body during rowing.
1 0 0 0 OA 中・長距離走におけるレース中の生理応答とパフォーマンスの関係
長距離走は、有酸素性能力(最大酸素摂取量、乳酸性代謝閾値、走の経済性の3要因)によってパフォーマンスの大部分を説明できると言われている。本研究では、レース中の生理応答、縦断的な体力測定などから中・長距離走のパフォーマンスと体力特性について検討した。中距離走の場合、有酸素性能力だけでなく無酸素性能力の貢献も大きく、また、体力特性に応じたレース戦略が重要であることが明らかとなった。一方、優れた長距離ランナーでは、3要因の中でも走の経済性の貢献が特に大きいこと、そして脂質をエネルギーに利用する能力が優れていることが明らかとなった。