單次阻力運動後肌力恢復現象：脫氫異雄固酮－硫酸鹽所扮演之角色

Muscle Strength Recovery Following Acute Bout of Resistance Training: Role of Dehydroepiandrosterone Sulfate

10.5297/ser.1503.009

陳宗與(Chung-Yu Chen)；劉德智(Te-Chih Liu)；侯建文(Chien-Wen Hou)；林哲宏(Che-Hung Lin)；廖翊宏(Yi-Hung Liao)

運動訓練 ； 運動適應 ； 合成性荷爾蒙 ； exercise training ； exercise adaptation ； anabolic hormone

大專體育學刊

15卷3期（2013 / 09 / 30）

339 - 347

繁體中文;英文

本研究目的為探討單次中強度阻力運動後對上肢與下肢骨骼肌最大等長肌力恢復情形，並同時觀察血 清脫氫異雄固酮－硫酸鹽（dehydroepiandrosterone sulfate, DHEA-S）的濃度與肌力恢復之關聯。研究方法是以18位男性曲棍球選手，依下肢最大等長肌力分成高肌力（120.33±7.65 kg/w, n=9）與低肌力（71.66±3.57 kg/w, n=9）兩組。以50% 1-RM的運動強度進行單次阻力運動，包含6個運動項目，8下為1組，共做3組。所有受試者統一在早上空腹狀態下分別收集運動前、運動後立即、運動恢復48小時與72小時之血液樣本，以測量血清DHEA-S與皮質醇（cortisol）濃度。阻力運動後觀察恢復時（48與72小時）上肢與下肢最大等長肌力之變化。研究結果顯示：兩組受試者在身體測量學上無明顯差異。高肌力組在阻力運動完立即與恢復48小時之血清DHEA-S濃度顯著低於低肌力組，而各時間點血清皮質醇濃度則無明顯差異。單次阻力運動後，高肌力組上肢與下肢之最大等長肌力恢復變化率明顯高於低肌力組，且血清DHEA-S濃度與肌力恢復呈顯著負相關。本研究結論為單次中強度阻力運動後，高肌力組之最大等長肌力恢復效果明顯優於低肌力組，而此改善之效果可能與運動後DHEA-S濃度有關，顯示運動訓練造成個體不同程度上的適應結果，DHEA-S濃度可能扮演重要的調控角色。

The purpose of this study was to investigate the effects of acute bout of moderate intensity resistance exercise on the recovery of maximal isometric muscle strength. Additionally, the association between muscle strength recovery and serum level of dehydroepiandrosterone sulfate (DHEA-S) was examined. Eighteen male hockey players were assigned into either high muscle strength (120.33±7.65 kg/w, HMS, n=9) or low muscle strength (71.66±3.57 kg/w, LMS, n=9) based on their maximal isometric strength of lower extremities. All subjects performed an acute bout of resistance training, consisting of 6 exercises. Three sets of 8 repetitions with 50% 1-RM intensity were performed for all exercises. Fasting blood samples were collected at pre-exercise, immediately after exercise, 48h and 72h after exercise for determining the serum DHEA-S and cortisol levels. Maximal isometric strength of upper and lower extremities was measured at 48h and 72h after acute bout of resistance exercise. No significant differences were detected in anthropometric measures between two groups. The serum DHEA-S level was significantly lower in HMS group at immediately and 48h after acute resistance exercise. However, there were no differences in serum cortisol levels at each time point between two groups. Maximal isometric muscle strength recovery was significantly faster in HMS group compared to LMS group. In addition, serum DHEA-S and muscle strength recovery showed markedly negative correlation. In conclusion, HMS group showed better recovery rate of muscle strength after acute bout of resistance exercise. This faster recovery could be associated with endogenous DHEA-S level, suggesting that endogenous DHEA-S might account for individual differences in training adaptation in response to resistance exercise.

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