Browsing by Publisher "Gdansk University of Physical Education and Sport"

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    Comparison of sprint interval and continuous endurance training on oxidative stress and antioxidant adaptations in young healthy adults
    (Gdansk University of Physical Education and Sport, 2021) Nalcakan G.R.; Onur E.; Oran A.; Varol S.R.
    Background: Different intensities of exercise induce varying levels of reactive oxygen species, causing oxidative stress. However, regular physical training enhances the antioxidant system and protects tissues by oxidative stress. This study aimed to investigate the difference in markers between time-efficient low-volume high intensity interval (sprint interval training: SIT) and traditional high-volume low-intensity methods (continuous endurance training: CET) regarding oxidative stress and antioxidant levels. Material and methods: Fifteen male volunteers were divided into two groups according to their VO2max levels. The SIT program consisted of 4–6 Wingate all-out sprints with a 4.5 min recovery, while CET consisted of 30–50 min cycling at 60% VO2max for seven weeks. Total oxidant status (TOS), total antioxidant status (TAS), plasma malondialdehyde (MDA) and glutathione peroxidase (GSH-Px) levels were examined in pre and post-intervention. Results: Increases in GSH-Px (30% vs. 55%), TOS (33% vs. 18%) and a significant decrease in MDA (8.6%, p<0.003; 6.8%, p<0.016) in CET and SIT were observed, respectively. By contrast, TAS decreased (62%) after CET and increased (17%) after SIT. No significant differences in these parameters were reported after the training period between SIT and CET groups. Conclusions: SIT was suggested as a safe exercise model to improve general health and the performance of traditional CET. © Gdansk University of Physical Education and Sport, Poland.
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    Effect of different diet methods on body composition and insulin, leptin, and ghrelin levels in overweight women
    (Gdansk University of Physical Education and Sport, 2022) Sarica B.; Rudarli Nalcakan G.; Onur E.
    Introduction. This study aims to compare the effects of similar calorie-restricted intermittent overnight fasting diet (OFD) and frequent-meal diet (FMD) on body composition and insulin, leptin, and ghrelin levels in overweight women. Materials and Methods: While the FMD was administered as six mealtimes, the OFD was administered as five mealtimes and at least 12 hours overnight fasting for four weeks. Some parameters regarding the metabolic rate and fat metabo-lism (glucose, insulin, HOMA-IR, leptin, ghrelin levels), body composition, resting metabolic rate, and physical activity level were measured before and after the diet. Results: There was no sig-nificant difference in the resting metabolic rate (kcal) and fat-carbohydrate oxidation (g/min), while diet programs showed a similar significant improvement in body composition in both groups (p < 0.05). The glucose and insulin levels in OFD and the insulin level and the insulin re-sistance index in FMD significantly decreased (p < 0.05). There were significant differences in the leptin (-37%) and ghrelin (5.8%) levels in FMD, but only a significant decrease in the leptin level (-49%) was observed in OFD. Conclusions: After a 4-week same calorie-restricted FMD with six meals and OFD with a 12 hour-overnight fasting, similar improvements in the body composition and the insulin, leptin, and ghrelin levels have been achieved. © 2022 by Gdansk University of Physical Education and Sport.