期刊
JOURNAL OF APPLIED PHYSIOLOGY
卷 94, 期 4, 页码 1365-1372出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/japplphysiol.00833.2002
关键词
endurance exercise; intramyocellular lipid; proton magnetic resonance spectroscopy; carbohydrate loading; free fatty acids
Vastus lateralis intramyocellular lipid (IMCL) content was assessed by H-1-magnetic resonance spectroscopy before and after prolonged time trial cycling bouts of similar to3-h duration. Six highly trained male cyclists completed a double-blind, randomized, crossover design of two experimental trials after a strenuous exercise bout and 48 h of high (HC) (9.32 +/- 0.08 g.kg(-1).day(-1)) and low (LC) (0.59 +/- 0.21 g.kg(-1).day(-1)) dietary carbohydrate. Resting IMCL content was significantly higher after LC vs. HC (P < 0.01) and was reduced during exercise by 64 and 57%, respectively. IMCL was not different between conditions after exercise (P > 0.05). The approximately twofold increase in IMCL degradation in LC compared with HC suggests that higher rates of whole body lipid metabolism in LC were in part attributable to a greater IMCL utilization. Four subjects experienced reductions of IMCL in excess of 70% during exercise. To our knowledge, this is the first study to report near depletion of IMCL during prolonged cycling, indicating that IMCL, presumably the triacylglycerol component, may be exhausted by prolonged strenuous exercise.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据