The diurnal variation on cardiovascular endurance performance of secondary school athlete student

Chun Yip CHIN, Chi Ching CHOW, Kwong Chung HUNG, Lik Hang KAM, Ka Chun CHAN, Yuen Ting MOK, Nga Mei CHENG

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2 Citations (Scopus)


Background: The previous investigations in diurnal variation of endurance sports performance did not reach a consensus and have been limited. This study would be a valuable resource for endurance sports trainers and event managers to plan their training and competition in a specific time of day. Objectives: The aim of this study is to find out the diurnal variation in cardiovascular endurance performance in the young athletes. Materials and Methods: Thirty five athlete students (15.17 ± 1.62 years) participated in this study. Maximal oxygen uptake (VO₂ mₐₓ), post-exercise percentage of maximal heart rate (MHR% post-ex), post-exercise body temperature (BTemppost-ex), and post exercise blood lactic acid level (LApost-ex) were measured in this study. Three non-consecutive testings: A) Morning (09:00-10:00; AM), B) Noon (12:00-13:00; NN) and C) Afternoon (16:00-17:00; PM) were conducted. Participants were required to follow the meal plan and resting schedule for all testing days. Results: VO₂ mₐₓ was significantly higher at NN (F2. 68 = 3.29, P < 0.05, η2 = 0.088) in comparison with PM. The MHR%post-ex, BTemppost-ex, LApost-ex was not significantly different among three times of day. Conclusions: Diurnal effect on endurance performance was found and the highest exercise VO₂ mₐₓ was identified at noon. Secondary school students or young athletes are recommended to have sports training related to VO₂ mₐₓ at noon for the purpose of maximizing training effectiveness. Copyright © 2015 Sports Medicine Research Center.
Original languageEnglish
Article numbere22697
JournalAsian Journal of Sports Medicine
Issue number2
Publication statusPublished - Jun 2015



Chin, C.-Y., Chow, G. C.-C., Hung, K.-C., Kam, L.-H., Chan, K.-C., Mok, Y.-T., et al. (2015). The diurnal variation on cardiovascular endurance performance of secondary school athlete student. Asian Journal of Sports Medicine, 6(2), Article e22697.


  • Circadian rhythm
  • Aerobic exercise
  • Diurnal effect
  • Oxygen
  • Athlete
  • Students