A comparison of skeletal muscle oxygenation and fuel use in sustained continuous and intermittent exercise.

M A Christmass, B Dawson, P Passeretto, P G Arthur
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引用次数: 90

Abstract

In this study we compared substrate oxidation and muscle oxygen availability during sustained intermittent intense and continuous submaximal exercise with similar overall (i.e. work and recovery) oxygen consumption (VO2). Physically active subjects (n = 7) completed 90 min of an intermittent intense (12 s work:18 s recovery) and a continuous submaximal treadmill running protocol on separate days. In another experiment (n = 5) we compared oxygen availability in the vastus lateralis muscle between these two exercise protocols using near-infrared spectroscopy. Initially, overall VO(2) (i.e. work and recovery) was matched, and from 37.5 min to 67.5 min of exercise was similar, although slightly higher during continuous exercise (8%; P < 0.05). Energy expenditure was constant (22.5-90 min of exercise) and was not different in intermittent intense [0.81 (0.01) kJ x min(-1). kg(-1)] and continuous submaximal [0.85 (0.01) kJ x min(-1) x kg(-1)] exercise. Overall exercise intensity, represented as a proportion of peak aerobic power (VO2(peak)), was 68.1 (2.5)% VO2(peak) and 71.8 (1.8)% VO2(peak) for intermittent and continuous exercise protocols, respectively. Fat oxidation was almost 3 times lower (P < 0.05) and carbohydrate oxidation was approximately 1.2 times higher (P < 0.05) during intermittent compared to continuous exercise, despite the same overall energy expenditure. Capillary plasma lactate was constant from 15 to 90 min of exercise, and pyruvate was constant from 15 to 75 min, although both were higher (P < 0.0001, lactate; P < 0.001, pyruvate) during intermittent [5.05 (0.28) mM, 200 (7) microM, respectively] compared to continuous exercise [2.41 (0.10) mM, 114 (4) microM, respectively]. There was no difference between protocols for either plasma glycerol or non-esterified fatty acids. The decrease in muscle oxygenation during work periods of intermittent exercise resulted in a lower nadir oxygenation [54.62 (0.41)%] compared to continuous exercise [58.82 (0.21)%, P < 0.001]. The decline in oxygenation was correlated with treadmill speed (r = 0.72; P < 0.05). These results show a difference in substrate utilisation and muscle oxygen availability during sustained intermittent intense and continuous submaximal exercise, despite a similar overall VO(2) and identical energy expenditure.

持续和间歇运动中骨骼肌氧合和燃料消耗的比较。
在这项研究中,我们比较了持续间歇高强度和连续次大强度运动中基质氧化和肌肉氧利用率,以及相似的总体耗氧量(即工作和恢复)。体力活动的受试者(n = 7)在不同的天完成90分钟的间歇性高强度(12秒工作:18秒恢复)和连续的次极限跑步机跑步方案。在另一项实验(n = 5)中,我们使用近红外光谱比较了两种运动方案之间股外侧肌的氧气利用率。最初,总体VO(2)(即工作和恢复)是匹配的,从37.5分钟到67.5分钟的运动是相似的,尽管在连续运动期间略高(8%;P < 0.05)。能量消耗是恒定的(22.5-90分钟的运动),间歇强度没有差异[0.81 (0.01)kJ x min(-1)]。和连续亚极大[0.85 (0.01)kJ x min(-1) x kg(-1)]运动。总体运动强度,表示为峰值有氧能力(VO2(峰值))的比例,在间歇和连续运动方案中分别为68.1 (2.5)% VO2(峰值)和71.8 (1.8)% VO2(峰值)。尽管总能量消耗相同,但间歇运动与连续运动相比,脂肪氧化几乎低3倍(P < 0.05),碳水化合物氧化大约高1.2倍(P < 0.05)。运动15 ~ 90 min时毛细血管血浆乳酸保持不变,运动15 ~ 75 min时丙酮酸保持不变,但两者均较高(P < 0.0001,乳酸;P < 0.001,丙酮酸)间歇运动[分别为5.05 (0.28)mM, 200 (7) microM]与连续运动[分别为2.41 (0.10)mM, 114 (4) microM]相比。血浆甘油和非酯化脂肪酸的方案之间没有差异。间歇运动期间肌肉氧合的减少导致最低点氧合[54.62(0.41)%]低于连续运动[58.82 (0.21)%,P < 0.001]。氧合下降与跑步机速度相关(r = 0.72;P < 0.05)。这些结果表明,尽管总体VO(2)和能量消耗相同,但在持续的间歇高强度和连续次大强度运动中,底物利用率和肌肉氧利用率存在差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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