Effect of High-Intensity Exhaustive Exercise on Intramyocellular and Extramyocellular Lipid Levels in Crural Muscles of Young Adults

高強度衰竭運動對小腿肌肉之肌細胞內、外脂肪含量的影響

蔡佈曦(Pu-Hsi Tsai) ； 何應志(Ying-Chih Ho)

《大專體育學刊》 22卷1期 (2020/03) Pp. 77-86

https://doi.org/10.5297/ser.202003_22(1).0006

摘要

This study aimed to investigate the effect of high-intensity exhaustive exercise on the intramyocellular lipids (IMCL) and extramyocellular lipids (EMCL) levels in soleus muscles (SOL) and tibialis anterior muscles (TA) of young adults. Eight healthy males performed a single bout of treadmill exercise at 80% VO_(2max) until exhaustion. Localized in vivo proton magnetic resonance spectroscopy was used to evaluate the lipid levels in two crural muscle groups at four time points: pre-exercise, immediately after exercise (0 hr), 1 hr, and 2 hr post-exercise. IMCL and EMCL lipid levels in SOL and TA muscles were measured in response to exercise challenge. We found that IMCL concentrations in SOL were significantly lower after exercise than before exercise; however, EMCL showed no difference in response to exercise. Both IMCL and EMCL levels in TA muscles were not significantly altered after high-intensity exhaustive exercise. We conclude that more energy relied on SOL muscle fiber, independent of TA fiber, under high-intensity exhaustive treadmill exercise. The type of muscle fiber recruited during high-intensity exhaustive exercise may explain the discrepancies in the lipid levels observed in SOL and TA muscle fibers.

關鍵字

soleus muscle ； tibialis anterior muscle ； magnetic resonance spectroscopy

並列摘要

本研究的目的為探討高強度衰竭運動對比目魚肌（soleus, SOL）及脛前肌（tibialis anterior, TA）肌細胞內脂肪（intramyocellular lipids, IMCL）、肌肉細胞外脂肪（extramyocellular lipids, EMCL）含量的影響。研究對象為8位健康男學生，以強度80% VO_(2max)之跑步機運動至衰竭，於運動前、運動後及運動後1、2小時，進 行小腿中兩種肌肉群之活體^1H-磁振頻譜掃描。測量SOL及TA在運動前後IMCL及EMCL的變化。結果顯示高強度衰竭運動後，SOL的IMCL比運動前顯著下降，EMCL則運動後沒有差異，而運動後1、2小時，不論IMCL或EMCL都與運動前沒有差異。TA則運動前與運動後恢復期IMCL及EMCL都沒有顯著的差異。本研究結論為在高強度運動，SOL肌肉纖維會使用較多的IMCL能量，因此在運動後顯著下降。然而，TA高強度運動期間沒有使用IMCL及EMCL能量，可能高強度運動期間SOL及TA肌纖維利用形態的不同，造成兩者不同的結果。

並列關鍵字

比目魚肌 ； 脛前肌 ； 磁振頻譜

參考文獻

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