Effects of Fructose-Electrolyte-Antioxidant Vitamin Commercial Sports Drink Ingestion on Muscle Damage and Energy Metabolic Response during Exhaustive Exercise

LANGUAGE NOTE | Document text in English; abstract also in Chinese. The purpose of this study was to investigate the effects of drinking a fructose -electrolyte- antioxidant vitamin commercial sports drink on muscle damage and energy metabolic response. A randomized double-blind controlled cross-over study was designed. Eight untrained healthy males completed twice cycling exercise of 70% VO2 max until exhaustion. During exercise subjects took of 170 mL commercial sports drink or placebo every 15 min. Concentrations or activities of CK, CK-MB, glucose, lactate, SOD, GSH and MDA+4-HNE in blood were measured pre-exercise (Pre-Ex), at 30 min during exercise (Ex-30), and exhaustion (Post-Ex). There were no significant differences in the antioxidant status parameters between the two treatment groups. However, the CK and CK-MB activities at Post-Ex in the supplement group were significantly lower than the values in the placebo group. The plasma lactate concentration at Ex-30 in the supplement group was significantly lower than that in the placebo group (5.6±3.4 vs 7.1±3.4 mmol/L, p<0.05). The blood glucose concentration at Post-Ex in the supplement group was significantly higher than the value in the placebo group (6.2±1.4 vs 4.710.5 mmol/ L, p<0.05). In conclusion, ingesting the commercial sports drink used in this study alters energy metabolic response during exercise and may attenuate the degree of muscle cell damage. 本研究之目的在探討攝取含果糖、電解質及抗氧化維生憲的市售飲料對肌肉損傷及能量代謝反應的影響。研究以8位未受過訓練的健康男性為對象採雙盲、交叉設計。受試者以70% VO2 max的強度進行腳踏車運動至力竭運動期間每15分鐘補充170毫升的市售飲料或安慰劑並於運動前、運動中30分鐘及運動採集血液測量其中之肌酸激酶、葡萄糖、乳酸、超氧化物歧化酶、穀胱甘肽及丙二醛。結果顯示二組間之抗氧化能力並無差異但補充劑組在運動後的CK及CK-MB活性與運動中30分鐘的血乳酸值均顯著低於安慰劑組(p<0.05)且運動後的血糖值亦顯著高於安慰劑組(6.2 ±1.4 vs 4.7 ±0.5 mmol/Lp<0.05)。此結果證實補充市售之運動飲料可改變運動中的能量代謝反應及減少肌肉損傷。