Does observance of Ramadan affect sleep in athletes and physically active individuals? A systematic review and meta-analysis.
Ramadan observance
athlete
daytime sleepiness
nap
physical activity
sleep-wake patterns
Journal
Journal of sleep research
ISSN: 1365-2869
Titre abrégé: J Sleep Res
Pays: England
ID NLM: 9214441
Informations de publication
Date de publication:
06 2022
06 2022
Historique:
revised:
09
09
2021
received:
18
02
2021
accepted:
30
09
2021
pubmed:
26
10
2021
medline:
6
5
2022
entrez:
25
10
2021
Statut:
ppublish
Résumé
The purpose of this systematic review and meta-analysis is to provide an accurate description of the effect of Ramadan observance on sleep duration, sleep quality, daily nap duration, and daytime sleepiness in athletes and physically active individuals. Five electronic databases (PubMed, Web of Science, Scopus, Wiley, and Taylor and Francis) were used to search for relevant studies conducted with athletes or physically active individuals during Ramadan, published in any language, and available before May 23, 2021. Studies that included assessments of sleep quantity and/or quality, and/or daytime sleepiness, and/or daily naps in athletes and physically active individuals were included. The methodological quality of the studies was assessed using "QualSyst". Of the 18 papers included in this study (298 participants in total), 14 were of strong quality, two were moderate, and the remaining two were rated as weak. Individuals who continued to train during Ramadan experienced a decrease in sleep duration (number of studies, K = 17, number of participants, N = 289, g = -0.766, 95% confidence interval [CI] -1.199 to -0.333, p = 0.001). Additionally, the global score of the Pittsburgh Sleep Quality Index increased from 4.053 (K = 5, N = 65, 95% CI 3.071-5.034) pre-Ramadan, to 5.346 (95% CI 4.362-6.333) during Ramadan, indicating a decrease in sleep quality. The duration of daytime naps increased during compared to pre-Ramadan (K = 2, N = 31, g = 1.020, 95% CI 0.595-1.445, p = 0.000), whereas Epworth Sleepiness Scale scores remained unchanged during versus pre-Ramadan (K = 3, N = 31, g = 0.190, 95% CI -0.139-0.519, p = 0.257). In conclusion, individuals who continued to train during Ramadan experienced a decrease in sleep duration, impairment of sleep quality, and increase in daytime nap duration, with no change in daytime sleepiness levels.
Types de publication
Journal Article
Meta-Analysis
Review
Systematic Review
Langues
eng
Sous-ensembles de citation
IM
Pagination
e13503Informations de copyright
© 2021 The Authors. Journal of Sleep Research published by John Wiley & Sons Ltd on behalf of European Sleep Research Society.
Références
Abdessalem, R., Boukhris, O., Hsouna, H., Trabelsi, K., Ammar, A., Taheri, M., … Chtourou, H. (2019). Effect of napping opportunity at different times of day on vigilance and shuttle run performance. Chronobiology International, 36(10), 1334-1342. https://doi.org/10.1080/07420528.2019.1642908
Almeneessier, A. S., & BaHammam, A. S. (2018). How does diurnal intermittent fasting impact sleep, daytime sleepiness, and markers of the biological clock? Current insights. Nature and Science of Sleep, 10, 439.
Almeneessier, A. S., Pandi-Perumal, S. R., & BaHammam, A. S. (2018). Intermittent fasting, insufficient sleep, and circadian rhythm: interaction and effects on the cardiometabolic system. Current Sleep Medicine Reports, 4(3), 179-195. https://doi.org/10.1007/s40675-018-0124-5
Ammar, A., Boukhris, O., Hsouna, H., Dhia, I. B., Trabelsi, K., Gujar, T. A., … Hokelmann, A., (2021). The effect of a daytime 60-min nap opportunity on postural control in highly active individuals. Biology of Sport, 38(4), 683-691.
Andrade, A., Bevilacqua, G., Casagrande, P., Brandt, R., & Coimbra, D. (2019). Sleep quality associated with mood in elite athletes. The Physician and Sportsmedicine, 47(3), 312-317.
Andrade, A., Bevilacqua, G. G., Coimbra, D. R., Pereira, F. S., & Brandt, R. (2016). Sleep quality, mood and performance: A study of elite Brazilian volleyball athletes. Journal of Sports Science & Medicine, 15(4), 601.
Aziz, A. R., Che Muhamad, A. M., Roslan, S. R., Ghulam Mohamed, N., Singh, R., & Chia, M. Y. H. (2017). Poorer intermittent sprints performance in Ramadan-fasted Muslim footballers despite controlling for pre-exercise dietary intake, sleep and training load. Sports, 5(1), 4. https://doi.org/10.3390/sports5010004
Aziz, A. R., Che Muhamed, A. M., Ooi, C. H., Singh, R., & Chia, M. Y. H. (2018). Effects of Ramadan fasting on the physical activity profile of trained Muslim soccer players during a 90-minute match. Science and Medicine in Football, 2(1), 29-38. https://doi.org/10.1080/24733938.2017.1393550
Aziz, A. R., Chia, M. Y. H., Low, C. Y., Slater, G. J., Png, W., & Teh, K. C. (2012). Conducting an acute intense interval exercise session during the Ramadan fasting month: What is the optimal time of the day? Chronobiology International, 29(8), 1139-1150. https://doi.org/10.3109/07420528.2012.708375
Aziz, A. R., Wahid, M. F., Png, W., & Jesuvadian, C. V. (2010). Effects of Ramadan fasting on 60 min of endurance running performance in moderately trained men. British Journal of Sports Medicine, 44(7), 516-521. https://doi.org/10.1136/bjsm.2009.070425
BaHammam, A. (2003). Sleep pattern, daytime sleepiness, and eating habits during the month of Ramadan. Sleep and Hypnosis, 5, 165-174.
BaHammam, A. (2004). Effect of fasting during Ramadan on sleep architecture, daytime sleepiness and sleep pattern. Sleep and Biological Rhythms, 2(2), 135-143. https://doi.org/10.1111/j.1479-8425. 2004.00135.x
Begg, C. B., & Mazumdar, M. (1994). Operating characteristics of a rank correlation test for publication bias. Biometrics, 50, 1088-1101. https://doi.org/10.2307/2533446
Blanchfield, A. W., Lewis-Jones, T. M., Wignall, J. R., Roberts, J. B., & Oliver, S. J. (2018). The influence of an afternoon nap on the endurance performance of trained runners. European Journal of Sport Science, 18(9), 1177-1184. https://doi.org/10.1080/17461391.2018.1477180
Bouhlel, H., Latiri, I., Zarrouk, N., Bigard, X., Shephard, R., Tabka, Z., & Bouhlel, E. (2014). Effet du jeûne du Ramadan et de l'exercice maximal sur le temps de réaction simple et de choix chez des sujets entraînés. Science & Sports, 29(3), 131-137. https://doi.org/10.1016/j.scispo.2014.02.002
Boukhris, O., Abdessalem, R., Ammar, A., Hsouna, H., Trabelsi, K., Engel, F. A., … Chtourou, H. (2019). Nap opportunity during the daytime affects performance and perceived exertion in 5-m shuttle run test. Frontiers in Physiology, 10, 779. https://doi.org/10.3389/fphys.2019.00779
Boukhris, O., Hsouna, H., Chtourou, L., Abdesalem, R., BenSalem, S., Tahri, N., … Chtourou, H. (2019). Effect of Ramadan fasting on feelings, dietary intake, rating of perceived exertion and repeated high intensity short-term maximal performance. Chronobiology International, 36(1), 1-10. https://doi.org/10.1080/07420528.2018.1513943
Boukhris, O., Trabelsi, K., Ammar, A., Abdessalem, R., Hsouna, H., Glenn, J. M., … Chtourou, H. (2020). A 90 min daytime nap opportunity is better than 40 min for cognitive and physical performance. International Journal of Environmental Research and Public Health, 17(13), 4650. https://doi.org/10.3390/ijerph17134650
Boukhris, O., Trabelsi, K., Shephard, R. J., Hsouna, H., Abdessalem, R., Chtourou, L., … Chtourou, H. (2019). Sleep patterns, alertness, dietary intake, muscle soreness, fatigue, and mental stress recorded before, during and after Ramadan observance. Sports, 7(5), 118. https://doi.org/10.3390/sports7050118
Brandt, R., Bevilacqua, G. G., & Andrade, A. (2017). Perceived sleep quality, mood states, and their relationship with performance among Brazilian elite athletes during a competitive period. Journal of Strength and Conditioning Research, 31(4), 1033-1039. https://doi.org/10.1519/JSC.0000000000001551
Brandt, R., da Silveira Viana, M., Crocetta, T. B., & Andrade, A. (2016). Association between mood states and performance of Brazilian elite sailors: Winners vs. non-winners. Cultura, Ciencia y Deporte, 11(32), 119-125. https://doi.org/10.12800/ccd.v11i32.712
Buysse, D. J., Reynolds, C. F. III, Monk, T. H., Berman, S. R., & Kupfer, D. J. (1989). The Pittsburgh sleep quality index: A new instrument for psychiatric practice and research. Psychiatry Research, 28(2), 193-213. https://doi.org/10.1016/0165-1781(89)90047-4
Chamari, K., Briki, W., Farooq, A., Patrick, T., Belfekih, T., & Herrera, C. P. (2016). Impact of Ramadan intermittent fasting on cognitive function in trained cyclists: A pilot study. Biology of Sport, 33(1), 49-56. https://doi.org/10.5604/20831862.1185888
Chamari, K., Haddad, M., Wong, D. P., Dellal, A., & Chaouachi, A. (2012). Injury rates in professional soccer players during Ramadan. Journal of Sports Sciences, 30(sup1), S93-S102. https://doi.org/10.1080/02640414.2012.696674
Chennaoui, M., Desgorces, F., Drogou, C., Boudjemaa, B., Tomaszewski, A., Depiesse, F., … Gomez-Merino, D. (2009). Effects of Ramadan fasting on physical performance and metabolic, hormonal, and inflammatory parameters in middle-distance runners. Applied Physiology, Nutrition, and Metabolism, 34(4), 587-594. https://doi.org/10.1139/H09-014
Chtourou, H., Chtourou, L., Trabelsi, K., Tahri, N., & Souissi, N. (2018). Possible gastrointestinal disorders for athletes during Ramadan: An overview. Biological Rhythm Research, 49(1), 51-60. https://doi.org/10.1080/09291016.2017.1333196
Chtourou, H., H'mida, C., Boukhris, O., Trabelsi, K., Ammar, A., & Souissi, N. (2019). Nap opportunity as a strategy to improve short-term repetitive maximal performance during the 5-m shuttle run test: a brief review. International Journal of Sport Studies for Health, 2(2), e97538. https://doi.org/10.5812/intjssh.97538
Coyle, E. F. (2004). Fluid and fuel intake during exercise. Journal of Sports Sciences, 22(1), 39-55. https://doi.org/10.1080/0264041031000140545
Davenne, D. (2009). Sleep of athletes - problems and possible solutions. Biological Rhythm Research, 40(1), 45-52.
DerSimonian, R., & Laird, N. (1986). Meta-analysis in clinical trials. Controlled Clinical Trials, 7(3), 177-188. https://doi.org/10.1016/0197-2456(86) 90046-2
Drew, M., Vlahovich, N., Hughes, D., Appaneal, R., Burke, L. M., Lundy, B., … Waddington, G. (2018). Prevalence of illness, poor mental health and sleep quality and low energy availability prior to the 2016 Summer Olympic Games. British Journal of Sports Medicine, 52(1), 47-53. https://doi.org/10.1136/bjsports-2017-098208
Duval, S., & Tweedie, R. (2000). Trim and fill: a simple funnel-plot-based method of testing and adjusting for publication bias in meta-analysis. Biometrics, 56(2), 455-463. https://doi.org/10.1111/j.0006-341X.2000.00455.x
Egger, M., Smith, G. D., Schneider, M., & Minder, C. (1997). Bias in meta-analysis detected by a simple, graphical test. British Medical Journal, 315(7109), 629-634.
Erlacher, D., Ehrlenspiel, F., Adegbesan, O. A., & Galal El-Din, H. (2011). Sleep habits in German athletes before important competitions or games. Journal of Sports Sciences, 29(8), 859-866. https://doi.org/10.1080/02640414.2011.565782
Faris, M.-I., Jahrami, H. A., Alhayki, F. A., Alkhawaja, N. A., Ali, A. M., Aljeeb, S. H., … BaHammam, A. S. (2019). Effect of diurnal fasting on sleep during Ramadan: A systematic review and meta-analysis. Sleep and Breathing, 24(2), 771-782. https://doi.org/10.1007/s11325-019-01986-1
Faris, M. A. E., Jahrami, H. A., Alsibai, J., & Obaideen, A. A. (2020). Impact of Ramadan diurnal intermittent fasting on the metabolic syndrome components in healthy, non-athletic Muslim people aged over 15 years: A systematic review and meta-analysis. The British Journal of Nutrition, 123(1), 1-22. https://doi.org/10.1017/S000711451900254X
Faris, M. A. E., Jahrami, H. A., Obaideen, A. A., & Madkour, M. I. (2019). Impact of diurnal intermittent fasting during Ramadan on inflammatory and oxidative stress markers in healthy people: Systematic review and meta-analysis. Journal of Nutrition & Intermediary Metabolism, 15, 18-26. https://doi.org/10.1016/j.jnim.2018.11.005
Garbarino, S., Mascialino, B., Penco, M. A., Squarcia, S., De Carli, F., Nobili, L., … Ferrillo, F. (2004). Professional shift-work drivers who adopt prophylactic naps can reduce the risk of car accidents during night work. Sleep, 27(7), 1295-1302. https://doi.org/10.1093/sleep/27.7.1295
Gupta, L., Morgan, K., & Gilchrist, S. (2017). Does elite sport degrade sleep quality? A systematic review. Sports Medicine, 47(7), 1317-1333. https://doi.org/10.1007/s40279-016-0650-6
Halson, S. L. (2014). Monitoring training load to understand fatigue in athletes. Sports Medicine, 44(2), 139-147. https://doi.org/10.1007/s40279-014-0253-z
Hammouda, O., Romdhani, M., Chaabouni, Y., Mahdouani, K., Driss, T., & Souissi, N. (2018). Diurnal napping after partial sleep deprivation affected hematological and biochemical responses during repeated sprint. Biological Rhythm Research, 49(6), 927-939. https://doi.org/10.1080/09291016.2018.1429553
Hedges, L. V. (1981). Distribution theory for Glass's estimator of effect size and related estimators. Journal of Educational Statistics, 6(2), 107-128. https://doi.org/10.3102/10769986006002107
Herrera, C. P. (2012). Total sleep time in Muslim football players is reduced during Ramadan: a pilot study on the standardized assessment of subjective sleep-wake patterns in athletes. Journal of Sports Sciences, 30(Suppl. 1), S85-S91. https://doi.org/10.1080/02640414.2012.676666
Higgins, J., & Green, S. (2011). Cochrane Handbook for Systematic Reviews of Interventions. Wiley Blackwell.
Higgins, J. P., Thompson, S. G., Deeks, J. J., & Altman, D. G. (2003). Measuring inconsistency in meta-analyses. British Medical Journal, 327(7414), 557-560.
Hofmann, W., Schmeichel, B. J., & Baddeley, A. D. (2012). Executive functions and self-regulation. Trends in Cognitive Sciences, 16(3), 174-180. https://doi.org/10.1016/j.tics.2012.01.006
Hsouna, H., Abdessalem, R., Boukhris, O., Trabelsi, K., Chtourou, L., Tahri, N., … Chtourou, H. (2019). Short-term maximal performance, alertness, dietary intake, sleep pattern and mood states of physically active young men before, during and after Ramadan observance. PLoS ONE, 14(6), e0217851. https://doi.org/10.1371/journal.pone.0217851
Hsouna, H., Boukhris, O., Hill, D. W., Abdessalem, R., Trabelsi, K., Ammar, A., … Chtourou, H. (2021). A daytime 40-min nap opportunity after a simulated late evening soccer match reduces the perception of fatigue and improves 5-m shuttle run performance. Research in Sports Medicine, Online ahead of print. https://doi.org/10.1080/15438627.2021.1917400
Hsouna, H., Boukhris, O., Trabelsi, K., Abdessalem, R., Ammar, A., Glenn, J. M., … Chtourou, H. (2020). A thirty-five-minute nap improves performance and attention in the 5-m shuttle run test during and outside Ramadan observance. Sports, 8(7), 98. https://doi.org/10.3390/sports8070098
Hsouna, H., Boukhris, O., Trabelsi, K., Abdessalem, R., Ammar, A., Irandoust, K., … Chtourou, H. (2020). Effects of 25-min nap opportunity during Ramadan observance on the 5-m shuttle run performance and the perception of fatigue in physically active men. International Journal of Environmental Research and Public Health, 17(9), 3135. https://doi.org/10.3390/ijerph17093135
Hua, J., Jiang, H., Wang, H., & Fang, Q. (2021). Sleep duration and the risk of metabolic syndrome in adults: A systematic review and meta-analysis. Frontiers in Neurology, 12, 127. https://doi.org/10.3389/fneur.2021.635564
Iftikhar, I. H., Donley, M. A., Mindel, J., Pleister, A., Soriano, S., & Magalang, U. J. (2015). Sleep duration and metabolic syndrome. An updated dose-risk metaanalysis. Annals of the American Thoracic Society, 12(9), 1364-1372. https://doi.org/10.1513/AnnalsATS.201504-190OC
Jahrami, H. A., Alsibai, J., Clark, C. T., & Faris, M. A. E. (2020). A systematic review, meta-analysis, and meta-regression of the impact of diurnal intermittent fasting during Ramadan on body weight in healthy subjects aged 16 years and above. European Journal of Nutrition, 59(6), 2291-2316.
Johns, M. (2019). The official website of the Epworth sleepiness scale (ESS) and the Epworth sleepiness scale for children and adolescents (ESS-Chad). Retrieved from https://epworthsleepinessscale.com/about-the-ess/
Juliff, L. E., Halson, S. L., Hebert, J. J., Forsyth, P. L., & Peiffer, J. J. (2018). Longer sleep durations are positively associated with finishing place during a national multiday netball competition. The Journal of Strength & Conditioning Research, 32(1), 189-194. https://doi.org/10.1519/JSC.0000000000001793
Juliff, L. E., Halson, S. L., & Peiffer, J. J. (2015). Understanding sleep disturbance in athletes prior to important competitions. Journal of Science and Medicine in Sport, 18(1), 13-18. https://doi.org/10.1016/j.jsams.2014.02.007
Karli, U., Guvenc, A., Aslan, A., Hazir, T., & Acikada, C. (2007). Influence of Ramadan fasting on anaerobic performance and recovery following short time high intensity exercise. Journal of Sports Science & Medicine, 6(4), 490-497.
Kmet, L. M., Lee, R. C., & Cook, L. S. (2004). Standard quality assessment criteria for evaluating primary research papers from a variety of fields. Retrieved from http://www.ihe.ca/advanced-search/standard-quality-assessment-criteria-for-evaluating-primary-research-papers-from-a-variety-of-fields
Lastella, M., Roach, G. D., Miller, D. J., Versey, N., Romyn, G., & Sargent, C. (2018). Athletes underestimate sleep quantity during daytime nap opportunities. Chronobiology International, 35(6), 869-871. https://doi.org/10.1080/07420528.2018.1466787
Leiper, J. B., Junge, A., Maughan, R. J., Zerguini, Y., & Dvorak, J. (2008). Alteration of subjective feelings in football players undertaking their usual training and match schedule during the Ramadan fast. Journal of Sports Sciences, 26(S3), S55-S69. https://doi.org/10.1080/02640410802538176
Maquet, P. (2001). The role of sleep in learning and memory. Science, 294(5544), 1048-1052.
Maughan, R. J., & Shirreffs, S. M. (2012). Hydration and performance during Ramadan. Journal of Sports Sciences, 30(sup1), S33-S41. https://doi.org/10.1080/02640414.2012.688140
Meckel, Y., Ismaeel, A., & Eliakim, A. (2008). The effect of the Ramadan fast on physical performance and dietary habits in adolescent soccer players. European Journal of Applied Physiology, 102(6), 651-657. https://doi.org/10.1007/s00421-007-0633-2
Mejri, M. A., Hammouda, O., Chaouachi, A., Zouaoui, K., Rayana, M. B., & Souissi, N. (2014). Effects of two types of partial sleep deprivation on hematological responses during intermittent exercise: A pilot study. Science & Sports, 29(5), 266-274. https://doi.org/10.1016/j.scispo.2014.05.001
Mejri, M. A., Yousfi, N., Mhenni, T., Tayech, A., Hammouda, O., Driss, T., … Souissi, N. (2016). Does one night of partial sleep deprivation affect the evening performance during intermittent exercise in Taekwondo players? Journal of Exercise Rehabilitation, 12(1), 47. https://doi.org/10.12965/jer.150256
Moher, D., Liberati, A., Tetzlaff, J., & Altman, D. G. (2009). Preferred reporting items for systematic reviews and meta-analyses: The PRISMA statement. Annals of Internal Medicine, 151(4), 264-269. https://doi.org/10.7326/0003-4819-151-4-200908180-00135
Morris, S. B. (2008). Estimating effect sizes from pretest-posttest-control group designs. Organizational Research Methods, 11(2), 364-386. https://doi.org/10.1177/1094428106291059
Nakajima, K. (2018). Unhealthy eating habits around sleep and sleep duration: To eat or fast? World Journal of Diabetes, 9(11), 190-194. https://doi.org/10.4239/wjd.v9.i11.190
National Sleep Foundation (2016). How much sleep do we really need? Retrieved from http://sleepfoundation.org/how-sleep-works/how-much-sleep-do-we-really-need
O'Donnell, S., Beaven, C. M., & Driller, M. (2018). The influence of match-day napping in elite female netball athletes. International Journal of Sports Physiology and Performance, 13(9), 1143-1148. https://doi.org/10.1123/ijspp.2017-0793
Reyner, L. A., & Horne, J. A. (2013). Sleep restriction and serving accuracy in performance tennis players, and effects of caffeine. Physiology & Behavior, 120, 93-96. https://doi.org/10.1016/j.physbeh.2013.07.002
Roberts, S. S. H., Teo, W. P., & Warmington, S. A. (2019). Effects of training and competition on the sleep of elite athletes: A systematic review and meta-analysis. British Journal of Sports Medicine, 53(8), 513-522. https://doi.org/10.1136/bjsports-2018-099322
Roky, R., Chapotot, F., Hakkou, F., Benchekroun, M. T., & Buguet, A. (2001). Sleep during Ramadan intermittent fasting. Journal of Sleep Research, 10(4), 319-327. https://doi.org/10.1046/j.1365-2869.2001.00269.x
Romdhani, M., Souissi, N., Chaabouni, Y., Mahdouani, K., Driss, T., Chamari, K., & Hammouda, O. (2020). Improved physical performance and decreased muscular and oxidative damage with postlunch napping after partial sleep deprivation in athletes. International Journal of Sports Physiology and Performance, 15(6), 874-883. https://doi.org/10.1123/ijspp.2019-0308
Sadeghirad, B., Motaghipisheh, S., Kolahdooz, F., Zahedi, M. J., & Haghdoost, A. A. (2014). Islamic fasting and weight loss: A systematic review and meta-analysis. Public Health Nutrition, 17(2), 396-406. https://doi.org/10.1017/S1368980012005046
Sargent, C., Lastella, M., Halson, S. L., & Roach, G. D. (2021). How much sleep does an elite athlete need? International Journal of Sports Physiology and Performance, Online ahead of print. https://doi.org/10.1123/ijspp.2020-0896
Shechter, A., O’Keeffe, M., Roberts, A. L., Zammit, G. K., RoyChoudhury, A., & St-Onge, M. P. (2012). Alterations in sleep architecture in response to experimental sleep curtailment are associated with signs of positive energy balance. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 303(9), R883-R889. https://doi.org/10.1152/ajpregu.00222.2012
Simpson, N. S., Gibbs, E. L., & Matheson, G. O. (2017). Optimizing sleep to maximize performance: Implications and recommendations for elite athletes. Scandinavian Journal of Medicine & Science in Sports, 27(3), 266-274. https://doi.org/10.1111/sms.12703
Souabni, M., Hammouda, O., Romdhani, M., Trabelsi, K., Ammar, A., & Driss, T. (2021). Benefits of daytime napping opportunity on physical and cognitive performances in physically active participants: A systematic review. Sports Medicine, 51, 1-32.
Souissi, M., Souissi, Y., Bayoudh, A., Knechtle, B., Nikolaidis, P. T., & Chtourou, H. (2020). Effects of a 30 min nap opportunity on cognitive and short-duration high-intensity performances and mood states after a partial sleep deprivation night. Journal of Sports Sciences, 38(22), 2553-2561. https://doi.org/10.1080/02640414.2020.1793651
Tian, H. H., Aziz, A. R., Png, W., Wahid, M. F., Yeo, D., & Png, A. L. C. (2011). Effects of fasting during Ramadan month on cognitive function in Muslim athletes. Asian Journal of Sports Medicine, 2(3), 145-153. https://doi.org/10.5812/asjsm.34753
Trabelsi, K., Bragazzi, N., Zlitni, S., Khacharem, A., Boukhris, O., El-Abed, K., … Chtourou, H. (2020). Observing Ramadan and sleep-wake patterns in athletes: A systematic review, meta-analysis and meta-regression. British Journal of Sports Medicine, 54(11), 674-680. https://doi.org/10.1136/bjsports-2018-099898
Trabelsi, K., El Abed, K., Stannard, S. R., Jammoussi, K., Zeghal, K. M., & Hakim, A. (2012). Effects of fed- versus fasted-state aerobic training during Ramadan on body composition and some metabolic parameters in physically active men. International Journal of Sport Nutrition and Exercise Metabolism, 22(1), 11-18. https://doi.org/10.1123/ijsnem.22.1.11
Trabelsi, K., Moalla, W., Boukhris, O., Ammar, A., Elabed, K., Hakim, A., & Chtourou, H. (2018). Effects of practicing physical activity during Ramadan fasting on health-related indices: An updated brief review. International Journal of Sport Studies for Health, 1(3), e883789. https://doi.org/10.5812/intjssh.83789
Trabelsi, K., Stannard, S. R., Chtourou, H., Moalla, W., Ghozzi, H., Jamoussi, K., & Hakim, A. (2018). Monitoring athletes' hydration status and sleep patterns during Ramadan observance: methodological and practical considerations. Biological Rhythm Research, 49(3), 337-365. https://doi.org/10.1080/09291016.2017.1368214
Trabelsi, K., Stannard, S. R., Ghlissi, Z., Maughan, R. J., Kallel, C., Jamoussi, K., … Hakim, A. (2013). Effect of fed-versus fasted state resistance training during Ramadan on body composition and selected metabolic parameters in bodybuilders. Journal of the International Society of Sports Nutrition, 10(1), 1-11. https://doi.org/10.1186/1550-2783-10-23
Venter, R. E. (2014). Perceptions of team athletes on the importance of recovery modalities. European Journal of Sport Science, 14(suppl. 1), S69-S76. https://doi.org/10.1080/17461391.2011.643924
Vitale, J. A., Bonato, M., Petrucci, L., Zucca, G., La Torre, A., & Banfi, G. (2021). Acute sleep restriction affects sport-specific but not athletic performance in junior tennis players. International Journal of Sports Physiology and Performance, Online ahead of print. https://doi.org/10.1123/ijspp.2020-0390
Vlahoyiannis, A., Aphamis, G., Bogdanis, G. C., Sakkas, G. K., Andreou, E., & Giannaki, C. D. (2020). Deconstructing athletes' sleep: A systematic review of the influence of age, sex, athletic expertise, sport type, and season on sleep characteristics. Journal of Sport and Health Science, 10(4), 387-402. https://doi.org/10.1016/j.jshs.2020.03.006
Von Rosen, P., Frohm, A., Kottorp, A., Fridén, C., & Heijne, A. (2017). Too little sleep and an unhealthy diet could increase the risk of sustaining a new injury in adolescent elite athletes. Scandinavian Journal of Medicine & Science in Sports, 27(11), 1364-1371. https://doi.org/10.1111/sms.12735
Walsh, N. P., Halson, S. L., Sargent, C., Roach, G. D., Nédélec, M., Gupta, L., … Samuels, C. H. (2021). Sleep and the athlete: Narrative review and 2021 expert consensus recommendations. British Journal of Sports Medicine, 55(7), 356-368.
Waterhouse, J. (2010). Effects of Ramadan on physical performance: Chronobiological considerations. British Journal of Sports Medicine, 44(7), 509-515. https://doi.org/10.1136/bjsm.2007.071712
Waterhouse, J., Atkinson, G., Edwards, B., & Reilly, T. (2007). The role of a short post-lunch nap in improving cognitive, motor, and sprint performance in participants with partial sleep deprivation. Journal of Sports Sciences, 25(14), 1557-1566. https://doi.org/10.1080/02640410701244983
Watson, A., & Brickson, S. (2018). Impaired sleep mediates the negative effects of training load on subjective well-being in female youth athletes. Sports Health, 10(3), 244-249. https://doi.org/10.1177/1941738118757422
Wilson, D., Drust, B., & Reilly, T. (2009). Is diurnal lifestyle altered during Ramadan in professional Muslim athletes? Biological Rhythm Research, 40(5), 385-397. https://doi.org/10.1080/09291010903015996
Zerguini, Y., Kirkendall, D., Junge, A., & Dvorak, J. (2007). Impact of Ramadan on physical performance in professional soccer players. British Journal of Sports Medicine, 41(6), 398-400. https://doi.org/10.1136/bjsm.2006.032037