Author/Authors :
Chin، Chun-Yip نويسنده Unit of Associate Degree Studies, Faculty of Liberal Arts
and Social Sciences,The Hong Kong Institute of Education, Tai Po,
Hong Kong , , Chow، Gary Chi-Ching نويسنده Unit of Associate Degree Studies, Faculty of Liberal Arts
and Social Sciences,The Hong Kong Institute of Education, Tai Po,
Hong Kong , , Hung، Kwong-Chung نويسنده Unit of Associate Degree Studies, Faculty of Liberal Arts
and Social Sciences,The Hong Kong Institute of Education, Tai Po,
Hong Kong , , Kam، Lik-Hang نويسنده Unit of Associate Degree Studies, Faculty of Liberal Arts
and Social Sciences,The Hong Kong Institute of Education, Tai Po,
Hong Kong , , Chan، Ka-Chun نويسنده Unit of Associate Degree Studies, Faculty of Liberal Arts
and Social Sciences,The Hong Kong Institute of Education, Tai Po,
Hong Kong , , Mok، Yuen-Ting نويسنده Unit of Associate Degree Studies, Faculty of Liberal Arts
and Social Sciences,The Hong Kong Institute of Education, Tai Po,
Hong Kong , , Cheng، Nga-Mei نويسنده Unit of Associate Degree Studies, Faculty of Liberal Arts
and Social Sciences,The Hong Kong Institute of Education, Tai Po,
Hong Kong ,
Abstract :
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. The aim of this study is to find out the diurnal variation in
cardiovascular endurance performance in the young athletes. Thirty five
athlete students (15.17 ± 1.62 years) participated in this study.
Maximal oxygen uptake (VO2max), 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. VO2max 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. Diurnal effect on
endurance performance was found and the highest exercise VO2max was
identified at noon. Secondary school students or young athletes are
recommended to have sports training related to VO2max at noon for the
purpose of maximizing training effectiveness.
