Abstract
Knowledge of the circadian rhythm of the blind person and diurnal changes in anaerobic power and hormones concentration can create the possibility of individualising physical training. The aim of the study was to examine the time-of-day effects on anaerobic performance and the concentration of selected hormones. The measurements were performed at two different times of the day (10:00 a.m., 10:00 p.m.) in blind men at the age of 20–25 years old. The experiment group was chosen by using repeated hormonal tests four times a day so that each selected patient had a sleep/wake cycle even of 24 h. Anaerobic peak power and total work were tested in an anaerobic sprint test, and the concentration of growth hormone, testosterone, cortisol, and melatonin was determined. In blind men, the hormonal response was not driven by the photoperiod as in the control group. In the blind group, at 10:00 p.m., anaerobic peak power and total work results were significantly higher than at 10:00 a.m. and negatively correlated with melatonin levels. No such correlation was found in the control group.
Highlights
Knowledge of the circadian rhythm of the blind person and diurnal changes in anaerobic power and hormones concentration can create the possibility of individualising physical training
The average values of morphological indices in the BG and CG groups were in the following order: body height (BH)—173.8 ± 4.99 cm and 174.9 ± 3.87 cm, body mass (BM)—74.23 ± 12.04 kg and
The hormonal response is not determined by the photoperiod as in the case of the controls
Summary
Knowledge of the circadian rhythm of the blind person and diurnal changes in anaerobic power and hormones concentration can create the possibility of individualising physical training. At 10:00 p.m., anaerobic peak power and total work results were significantly higher than at 10:00 a.m. and negatively correlated with melatonin levels. Introduction with regard to jurisdictional claims in Studies on human circadian rhythm have been of interest to many researchers [1,2,3,4,5,6] Due to their nature, it is necessary to carry out research at practically all times of the day, taking seasonal rhythms into account. It is necessary to carry out research at practically all times of the day, taking seasonal rhythms into account They are difficult to implement and burdensome. The percentage of blind individuals practicing sport has been steadily growing, which further justifies the need for conducting such tests
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