Fashi Mohamad, Ahmadizad Sajad, Nobari Hadi, Pérez-Gómez Jorge, Oliveira Rafael, Carlos-Vivas Jorge, Ardigò Luca Paolo
Department of Biological Sciences in Sports, Faculty of Sport Sciences and Health, Shahid Beheshti University, Tehran 1983963113, Iran.
HEME Research Group, Faculty of Sport Sciences, University of Extremadura, 10003 Cáceres, Spain.
Healthcare (Basel). 2021 Apr 1;9(4):397. doi: 10.3390/healthcare9040397.
The aim of this study was to investigate the effect of acute Ramadan fasting (RF) on the muscle function and buffering system. Twelve male athletes with 8 years of professional sports experience (age, 23.2 ± 1.3 years, body mass index: 24.2 ± 2.2 kg/m) participated in this study. The subjects were tested twice, 3 weeks after the beginning of RF and 2 weeks after the end RF. Muscle function, buffering capacity, and rating of perceived exertion (RPE) were measured during and after RF by using the Biodex isokinetic machine, blood gas analyzer, and RPE 6-20 Borg scale, respectively. Venous blood samples for pH and bicarbonate (HCO) were measured during and after RF by using the Biodex isokinetic machine, blood gas analyzer, and RPE 6-20 Borg scale, respectively. Venous blood samples for pH and bicarbonate (HCO) were taken immediately after 25 repetitions of isokinetic knee flexion and extension. Measures taken during isokinetic knee extension during RF were significantly lower than those after RF in extension peak torque (t = -4.72, = 0.002), flexion peak torque (t = -3.80, = 0.007), extension total work (t = -3.05, = 0.019), extension average power (t = -4.20, = 0.004), flexion average power (t = -3.37, = 0.012), blood HCO (t = -2.02, = 0.041), and RPE (Z = -1.69, = 0.048). No influence of RF was found on the blood pH (t = 0.752, = 0.476). RF has adverse effects on muscle function and buffering capacity in athletes. It seems that a low-carbohydrate substrate during RF impairs muscle performance and reduces the buffering capacity of the blood, leading to fatigue in athletes.
本研究的目的是调查斋月期间急性禁食（RF）对肌肉功能和缓冲系统的影响。12名具有8年专业运动经验的男性运动员（年龄23.2±1.3岁，体重指数：24.2±2.2kg/m²）参与了本研究。受试者在斋月开始后3周和斋月结束后2周进行了两次测试。分别使用Biodex等速肌力测试仪、血气分析仪和6-20 Borg自觉用力程度量表在斋月期间及之后测量肌肉功能、缓冲能力和自觉用力程度（RPE）。在等速膝关节屈伸25次后立即采集用于测量pH值和碳酸氢盐（HCO₃⁻）的静脉血样本。斋月期间等速膝关节伸展时所测指标在伸展峰值扭矩（t = -4.72，P = 0.002）、屈曲峰值扭矩（t = -3.80，P = 0.007）、伸展总功（t = -3.05，P = 0.019）、伸展平均功率（t = -4.20，P = 0.004）、屈曲平均功率（t = -3.37，P = 0.012）、血液HCO₃⁻（t = -2.02，P = 0.041）和RPE（Z = -1.69，P = 0.048）方面均显著低于斋月之后。未发现斋月禁食对血液pH值有影响（t = 0.752，P = 0.476）。斋月禁食对运动员的肌肉功能和缓冲能力有不利影响。似乎斋月期间低碳水化合物底物会损害肌肉性能并降低血液缓冲能力，导致运动员疲劳。
