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Article

Effect of Acute Ramadan Fasting on Muscle Function and Buffering System of Male Athletes

1
Department of Biological Sciences in Sports, Faculty of Sport Sciences and Health, Shahid Beheshti University, Tehran 1983963113, Iran
2
HEME Research Group, Faculty of Sport Sciences, University of Extremadura, 10003 Cáceres, Spain
3
Sports Science School of Rio Maior–Polytechnic Institute of Santarém, 2140-413 Rio Maior, Portugal
4
Research Centre in Sport Sciences, Health Sciences and Human Development, 5001-801 Vila Real, Portugal
5
Life Quality Research Centre, 2140-413 Rio Maior, Portugal
6
Department of Neurosciences, Biomedicine and Movement Sciences, School of Exercise and Sport Science, University of Verona, 37131 Verona, Italy
*
Author to whom correspondence should be addressed.
Both authors contributed equally to this study.
Academic Editors: Kijin Kim and Nayoung Ahn
Healthcare 2021, 9(4), 397; https://doi.org/10.3390/healthcare9040397
Received: 23 February 2021 / Revised: 18 March 2021 / Accepted: 25 March 2021 / Published: 1 April 2021
(This article belongs to the Special Issue Nutrition for Sport and Exercise)
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/m2) 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 (HCO3) 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 (HCO3) 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, p = 0.002), flexion peak torque (t = −3.80, p = 0.007), extension total work (t = −3.05, p = 0.019), extension average power (t = −4.20, p = 0.004), flexion average power (t = −3.37, p = 0.012), blood HCO3 (t = −2.02, p = 0.041), and RPE (Z = −1.69, p = 0.048). No influence of RF was found on the blood pH (t = 0.752, p = 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. View Full-Text
Keywords: isokinetic; buffering capacity; muscle performance; RPE; HCO3 isokinetic; buffering capacity; muscle performance; RPE; HCO3
MDPI and ACS Style

Fashi, M.; Ahmadizad, S.; Nobari, H.; Pérez-Gómez, J.; Oliveira, R.; Carlos-Vivas, J.; Ardigò, L.P. Effect of Acute Ramadan Fasting on Muscle Function and Buffering System of Male Athletes. Healthcare 2021, 9, 397. https://doi.org/10.3390/healthcare9040397

AMA Style

Fashi M, Ahmadizad S, Nobari H, Pérez-Gómez J, Oliveira R, Carlos-Vivas J, Ardigò LP. Effect of Acute Ramadan Fasting on Muscle Function and Buffering System of Male Athletes. Healthcare. 2021; 9(4):397. https://doi.org/10.3390/healthcare9040397

Chicago/Turabian Style

Fashi, Mohamad, Sajad Ahmadizad, Hadi Nobari, Jorge Pérez-Gómez, Rafael Oliveira, Jorge Carlos-Vivas, and Luca P. Ardigò 2021. "Effect of Acute Ramadan Fasting on Muscle Function and Buffering System of Male Athletes" Healthcare 9, no. 4: 397. https://doi.org/10.3390/healthcare9040397

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