Sports and Exercise Science Research Centre, London South Bank University, London, United Kingdom.
Med Sci Sports Exerc. 2011 Aug;43(8):1544-51. doi: 10.1249/MSS.0b013e31820e5adc.
Montmorency cherries contain high levels of polyphenolic compounds including flavonoids and anthocyanins possessing antioxidant and anti-inflammatory effects. We investigated whether the effects of intensive unilateral leg exercise on oxidative damage and muscle function were attenuated by consumption of a Montmorency cherry juice concentrate using a crossover experimental design.
Ten well-trained male overnight-fasted athletes completed two trials of 10 sets of 10 single-leg knee extensions at 80% one-repetition maximum. Trials were separated by 2 wk, and alternate legs were used in each trial. Participants consumed each supplement (CherryActive® (CA) or isoenergetic fruit concentrate (FC)) for 7 d before and 48 h after exercise. Knee extension maximum voluntary contractions (MVC) were performed before, immediately after, and 24 and 48 h after the damaging exercise. Venous blood samples were collected at each time point, and serum was analyzed for creatine kinase (CK) activity, nitrotyrosine, high-sensitivity C-reactive protein, total antioxidant capacity, and protein carbonyls (PC). Two-way repeated-measures ANOVA were used for statistical analysis of the data.
MVC force recovery was significantly faster (24 h: CA 90.9% ± 4.2% of initial MVC vs FC 84.9% ± 3.4% of initial MVC; 48 h: CA 92.9% ± 3.3% of initial MVC vs FC 88.5% ± 2.9% of initial MVC (mean ± SEM); P < 0.05) after CA than FC consumption. Only serum CK and PC increased significantly from baseline, peaking 24 h after exercise (P < 0.001). The exercise-induced increase in CK activity was not different between trials. However, both the percentage (24 h after: CA 23.8% ± 2.9% vs FC 82.7% ± 11.7%; P = 0.013) and absolute (24 h after: CA 0.31 ± 0.03 nmol·mg(-1) protein vs FC 0.60 ± 0.08 nmol·mg(-1) protein; P = 0.079) increase in PC was lower in CA than FC trials.
Montmorency cherry juice consumption improved the recovery of isometric muscle strength after intensive exercise perhaps owing to the attenuation of the oxidative damage induced by the damaging exercise.
蒙莫朗西樱桃含有高水平的多酚化合物，包括类黄酮和花青素，具有抗氧化和抗炎作用。我们使用交叉实验设计研究了通过饮用浓缩蒙莫朗西樱桃汁是否可以减轻剧烈单侧腿部运动对氧化损伤和肌肉功能的影响。
10 名训练有素的男性夜间禁食运动员完成了 10 组 10 次单腿膝关节伸展运动，每组运动强度为 80%的最大重复次数。试验间隔 2 周，每条腿在每次试验中交替使用。参与者在运动前和运动后 48 小时内分别服用 7 天每种补充剂（CherryActive®（CA）或等能量水果浓缩物（FC））。在损伤运动前后、运动后即刻以及 24 和 48 小时后进行膝关节最大自主收缩（MVC）。在每个时间点采集静脉血样，并分析血清肌酸激酶（CK）活性、硝基酪氨酸、高敏 C 反应蛋白、总抗氧化能力和蛋白质羰基（PC）。采用双因素重复测量方差分析对数据进行统计学分析。
与 FC 相比，CA 能更快地恢复 MVC 力（24 小时：CA 为初始 MVC 的 90.9%±4.2%，FC 为初始 MVC 的 84.9%±3.4%；48 小时：CA 为初始 MVC 的 92.9%±3.3%，FC 为初始 MVC 的 88.5%±2.9%（平均值±SEM）；P<0.05）。只有血清 CK 和 PC 从基线显著升高，在运动后 24 小时达到峰值（P<0.001）。CK 活性的运动诱导增加在试验之间没有差异。然而，百分比（24 小时后：CA 23.8%±2.9%比 FC 82.7%±11.7%；P=0.013）和绝对值（24 小时后：CA 0.31±0.03 nmol·mg（-1）蛋白比 FC 0.60±0.08 nmol·mg（-1）蛋白；P=0.079）的 PC 增加均低于 FC 试验。
饮用蒙莫朗西樱桃汁可能通过减轻损伤运动引起的氧化损伤，改善剧烈运动后的等长肌肉力量恢复。
