Short-term effects of dietary fat on intramyocellular lipid in sprinters and endurance runners
Short-term effects of dietary fat on intramyocellular lipid in sprinters and endurance runners
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DOI：
10.1016/j.metabol.2007.10.013
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发表时间：
2008-03-01
影响因子：
9.8
通讯作者：
Kawamori, Ryuzo
中科院分区：
文献类型：
--
作者：
Tamura, Yoshifumi;Watada, Hirotaka;Kawamori, Ryuzo
短期脂肪负荷对耐力跑和短跑运动员不同类型肌肉中肌细胞内脂质（IMCL）的影响尚未完全阐明。本研究旨在探讨膳食脂肪对耐力跑和短跑运动员训练期比目鱼肌和胫骨前肌肌间质细胞的影响。选取7名男子耐力跑运动员和7名男子短跑运动员参加研究。我们测量TA-和SOL-IMCL水平后，3天的课程等热量正常（25%），高（60%），低脂（10%）的饮食在训练期间的H-1-磁共振波谱在每个主题。在短跑运动员中，TA-和SOL-IMCL水平在每个饮食方案后相当。然而，在耐力运动员中，正常脂肪和高脂肪饮食后的TA-IMCL水平分别是低脂饮食后的1.7倍和3.0倍。正常脂肪饮食和高脂肪饮食后的SOL-IMCL值分别是低脂饮食后的1.5倍和1.6倍。此外，与正常脂肪饮食相比，高脂饮食后的TA-IMCL水平显著升高，而SOL-IMCL水平无显著升高。我们的数据表明，训练期间短期的膳食脂肪挑战显著改变了耐力跑运动员的IMCL水平，但对短跑运动员没有影响。此外，耐力跑运动员的肌型变化也会影响IMCL对脂肪负荷的反应。这些表型和区域差异可能是由运动训练类型和肌纤维组成的差异来解释的。(C)2008年爱思唯尔公司All rights reserved.
The effect of short-term fat loading on intramyocellular lipid (IMCL) in different types of muscle in endurance runners and sprinters has not been fully elucidated yet. The purpose of this study was to investigate the effect of dietary lipid on IMCL in soleus muscle (SOL) and tibialis anterior muscle (TA) during training period in endurance runners and sprinters. Seven male endurance runners and 7 male sprinters were selected to participate in the study. We measured TA- and SOL-IMCL levels after 3-day course of isocaloric normal- (25%), high(60%), and low-fat (10%) diet during training period by H-1-magnetic resonance spectroscopy in each subject. In sprinters, TA- and SOL-IMCL levels were comparable after each diet protocol. However, in endurance runners, TA-IMCL levels after normal-fat and high-fat diets were 1.7 times and 3.0 times higher than that after low-fat diet, respectively. The SOL-IMCL values after normal-fat diet and high-fat diet were 1.5 times and 1.6 times higher than that after low-fat diet, respectively. In addition, the TA-IMCL level after high-fat diet, but not SOL-IMCL, was significantly higher compared with that after normal-fat diet. Our data suggested that short-term dietary fat challenge during training period significantly altered IMCL level in endurance runners, but not in sprinters. In addition, response to fat loading on IMCL was influenced by variation of muscle type in endurance runners. These phenotypic and regional differences might be explained by differences in type of exercise training and muscle fiber composition. (C) 2008 Elsevier Inc. All rights reserved.