The effect of time of day on Special Judo Fitness Test in active judokas: Evaluation in terms of chronotype

EKEN Ö., CEYLAN H. İ., Kurtoğlu A., Šimenko J.

Chronobiology International, vol.41, no.1, pp.61-71, 2024 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 41 Issue: 1
  • Publication Date: 2024
  • Doi Number: 10.1080/07420528.2023.2276196
  • Journal Name: Chronobiology International
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, BIOSIS, CAB Abstracts, EMBASE, Environment Index, MEDLINE, Psycinfo, SportDiscus, Veterinary Science Database
  • Page Numbers: pp.61-71
  • Keywords: Combat sports, conditioning, diurnal variation, specific preparation
  • Ataturk University Affiliated: Yes


The present cross-sectional study aims to examine the effect of time of day on the judo-specific performance in judokas, considering their chronotypes. Twenty-four male judokas participated in the study where the Morningness-Eveningness Questionnaire was administered, and on it, they were divided into morning-type (MT:12-judokas) and evening-type groups (ET:12-judokas). Afterwards, the Special Judo Fitness Test (SJFT) was applied to both groups at three different times (morning: 09:00 h, afternoon: 13:00 h and evening: 17:00 h) with body temperature measured before and after every SJFT performance. As a result, the Group*Test Time interaction significantly affected overall throwing performance during SJFT [F(2,44) = 29.437, p = 0.001, η2p:.572]. Furthermore, a significant time effect was found for the SJFT index [F(2,44) = 5.118, p = 0.010, η2p:.189] and for the Group*Test Time interaction with the mean value of the index [F(2,44) = 24.424, p < 0.001, η2p:.526]. Furthermore, body temperature had a significant time effect [F(2,44) = 301.454, p < 0.001, η2p:.932] and the Group*Test Time interaction [F(2,44) = 5.802, p = 0.006, η2p:.209]. In conclusion, coaches and exercise experts should consider judo athletes’ chronotype when planning special training programs to improve judo-specific anaerobic capacity. Furthermore, to minimize the impact of time of day and chronotype on athletes’ performance in competitions, it is recommended that MT athletes develop their judo-specific anaerobic capacity in the evening hours, when their performance is lower, while ET athletes should do so in the morning hours when their performance is lower via randori training.