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COMPARISON OF MUSCULAR FATIGUE ACCORDING TO SOCIAL JETLAG IN YOUNG SOCCER PLAYERS.
The sleep pattern has gained prominence in sports training, as it can directly influence the athlete's performance (cognitive and muscular function). Since the last decades, a reduction of sleep time in 2 hours/day has been visualized. In the specific case of young athletes, the reduction in sleep time is linked by several behavioral and biological changes caused by the biological maturation process. Thus, associating the training load, psychological load, and trips to championships, which can influence the difference between the sleep of mid-week sleep and weekend called social jetlag. However, there is little scientific evidence to clarify the possible influence of social jetlag on the sports performance of young soccer players.
Compare muscle fatigue index (FI) according to social jetlag classification in young soccer players.
The sample consisted of 73 young soccer players aged 12 to 15 years (14.5 ± 1.9 years; 58.7 ± 13.9 kg; 172.4 ± 11.7 cm), belonging to two academy soccer teams from Londrina/Paraná. Were collect measurements of Body size (body mass, height), duration and quality of sleep and social jet lag (Actigraph GT3X+), bone age (hand and wrist radiography). Social jetlag was categorized as recommended ≤2hs and not recommended ≥2hs. To compare the FI between social jetlag groups, the Mann-Whitney U test was used. Statistical analysis was performed using SPSS 25.0 software and the adopted significance was 5%.
Difference was noted only for chronological age (P=0.02), which the group classified as Not recommended has higher values. However, no significant difference was observed for FI (P=0.55).
It was concluded that FI didn’t show any significant difference between social jetlag groups in young soccer players. Longitudinal studies are suggested to verify the causality between this phenomenon.
Sleep, youth sports, adolescent, circadian rhythm.
Willian Sartorelli, Vinicius Muller Reis Weber, Julio Cesar da Costa, Maria Raquel de Oliveira Bueno, Paulo Henrique Borges, Luiz Fernando Ramos Silva, Marcelo Romanzini, Enio Ricardo Vaz Ronque