Aktivasyon Sonrası Potansiyasyonun Sürat performansına Etkisinin Sirkadiyen Ritme Göre İncelenmesi
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SUMMARY ÇETİN, A., Investigation of the Effect of Post-Activation Potentiation on Speed Performance According to Circadian Rhythm, Hacettepe University Graduate School of Health Sciences Sports Sciences and Technology Program Master Thesis, Ankara 2022. This study was conducted to investigate the effect of post activation potentiation (PAP) on speed performance according to circadian rhythm. 15 male athletes from team and individual sports participated in this study voluntarily. In order to determine the performance differences according to circadian rhythm, participants performed a 3x3 squat exercise with 85% of 1RM and 2 minutes rest between each set as PAP application in the morning (8:00-10:00) and in the evening (17:00-19:00) in random order and then they participated in the 30 meters sprint test with a 10m intervals at 15th sec, 2nd, 4th, 8th, 12th and 16thmin. Before each PAP, participants performed 30 m sprint test to determine baseline 30 m sprint performance as a reference measurement. Before the morning and evening of PAP protocols, blood samples were taken from the participants and their cortisol and testosterone hormone levels were determined. In addition, before the morning and evening PAP measurements, participants' oral body temperatures, resting heart rates (HRREST) and lactic acid levels (LAREST) were determined. In addition to the performance variables after PAP, maximal heart rate (HRMAX), minimum heart rate (HRMİN), lactic acid responses (LA) and ratings of percieved exertion (RPE) responses were determined as physiological variables for each measurement time. A 2x7 (time of day x time) two-way analysis of variance (ANOVA) with repeated measures was used for statistical analysis and Bonferroni post hoc analysis was performed when the F statistics was significant. It was determined that body temperature, which is one of the indicator of circadian rhythm, was not affected by the time of day (p>0.05). Testosterone and cortisol hormones, which are another indicators of circadian rhythm, were high in the morning hours (p<0.05). It was observed that the 10 m, 20 m and 30 m sprint performance was not affected by the time of day, and also the time of day x time interaction was not significant (p>0.05), however, the time effect at these distances was found to be significant (p<0.05). This effect on the 10 m sprint performance was due to the fact that the 15th sec, 12th and 16th min sprint performances were slower than the reference sprint performance. It has also been observed that the 15th sec and 12th min sprint performance was slower than the 2nd minute sprint performance (p<0,05). In 30 m sprint performance, the 15th sprint performance was slower than the reference, 2nd and 4th min sprint performance and the 16th min sprint performance was slower than the 2nd min sprint performance (p<0.05). When the flying10 m and 20 m sprint performances were examined, it is seen that the time of day and time effecs were not sginificant together with time of day x time interaction (p>0.05). In physiological responses, time of day effect and time of day x time interaction was not significant in HRMAX, HRMİN and LA responses (p>0.05), but the effect of time was significant (p<0.05). The significant effect of the time was due to the fact that the 15th sec HRmax value was higher than the 8th, 12th and 16th min HRMAX values (p<0.05), and for HRMİN, it was seen that the 15th sec value was higher than 4th and 8th min HRMİN values, and the 2nd min HRMİN value was higher than the 8th min value (p<0.05). Finally, the effect of time on the LA values was due to the 16th min LA value being higher than the 2nd min LA value (p<0.05). When the RPE responses were examined, it was seen that time of day and time effect and time of day x time interaction were not significant (p>0.05). As a result, the findings of this study showed that the effect of PAP on speed performance did not change according to the circadian rhtyhm.