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- Title
Effects of Ramadan on the Diurnal Variations of Repeated-Sprint Performance.
- Authors
Aloui, Asma; Chaouachi, Anis; Chtourou, Hamdi; Wong, Del P.; Haddad, Monoem; Chamari, Karim; Souissi, Nizar
- Abstract
Purpose: This study examined the effects of Ramadan on cycling repeated-sprint ability (RSA) and corresponding diurnal variations. Methods: Twelve active men performed an RSA test (5 x 6-s maximal sprints interspersed with 24 s passive recovery) during morning and afternoon sessions 1 wk before Ramadan (BR), during the second (R2) and the fourth (R4) weeks of Ramadan, and 2 wk after Ramadan (AR). Maximal voluntary contraction was assessed before (MVCpre), immediately after (MVCpost), and 5 min after the RSA test (MVCpost5). Moreover, hematocrit, hemoglobin, and plasma sodium and potassium (K+) concentrations were measured at rest and after the RSA test and MVCpost. Results: Overall, peak power (Ppeak) during the RSA test decreased throughout the 5 sprints. Ppeak measured in the first sprint and MVCpre were lower during Ramadan than BR in the afternoon (P < .05) and higher in the afternoon than the morning BR and AR (P < .05). However, this diurnal rhythmicity was not found for the last 4 sprints' Ppeak, MVCpost, and MVCpost5in all testing periods. Furthermore, the last 4 sprints' Ppeak, MVCpost, MVCpost5, and morning MVCpre were not affected by Ramadan. [K+] measured at rest and after the RSA test and MVCpost were higher during Ramadan than BR in the afternoon (P < .05) and higher in the afternoon than the morning during Ramadan (P < .05). Conclusions : Fatigability is higher in the afternoon during Ramadan, and, therefore, training and competition should be scheduled at the time of day when physical performance is less affected.
- Subjects
TUNISIA; EXERCISE; ANALYSIS of variance; ANTHROPOMETRY; ATHLETIC ability; CIRCADIAN rhythms; COMPARATIVE studies; CYCLING; EXERCISE physiology; EXERCISE tests; FASTING; HEMATOCRIT; HEMOGLOBINS; ISLAM; MUSCLE strength; MUSCLE strength testing; NUTRITIONAL assessment; POTASSIUM; RESEARCH funding; SODIUM; STATISTICS; DATA analysis; EFFECT sizes (Statistics); AMATEUR athletes; INTER-observer reliability; ERGOMETRY; RESEARCH methodology evaluation; EXERCISE intensity; FOOD diaries; DESCRIPTIVE statistics
- Publication
International Journal of Sports Physiology & Performance, 2013, Vol 8, Issue 3, p254
- ISSN
1555-0265
- Publication type
Article
- DOI
10.1123/ijspp.8.3.254