İyi Antrenmanlı Yarı-profesyonel Futbolcuların Koşuya Dayalı Anaerobik Sprint Test Performansında Diurnal Varyasyonlar

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Objective: This study examined whether there were diurnal variations in the running-based anaerobic sprint test (RAST) performance of semi-professional, male soccer players. Material and Methods: Participants included 25 people whose ages ranged from 18- 36 years old, (mean=20 years); weight ranged from 52-110 kg (mean=72 kg); mean height was 176.92±6.17 cm; experience playing soccer ranged from 5-22 years (mean=8 years); and average weekly training duration was 3-22 h (mean=6 h). Chronotypes were estimated using the Turkish version of the Horn-Östberg Morningness-Eveningness Personality Questionnaire. They performed RAST in a randomized study design using the Newtest Powertimer 300-series photocells twice, on two separate days, one week apart, either in the morning (8.30-10.00 AM) or afternoon (5.00-6.00 PM). Before each of test session; the air temperature and humidity; along with their oral body temperature and 24 h food intake data were recorded. Resultsː Paired t-tests were used to analyze differences due to the time of day in the RAST variables. Maximum power (p>0.05), minimum power (p>0.05), mean power (p>0.05), fatigue index (p>0.05), air temperature (p>0.05), body temperature, and caloric intake (p>0.05) did not differ in the morning and afternoon. Conclusion: In contrast to previous research, RAST performance showed no diurnal variations. A possible explanation could be attributed to the participants' chronotypes conforming to neither the morning nor evening types. However, replicating this study with soccer players having an extreme morning or extreme evening chronotypes may lead to different results.