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    The acute effect of a single exhaustive sprint exercise session on post-exercise fat oxidation rate
    (WALTER DE GRUYTER GMBH, 2018) Aslankeser, Zubeyde; Balci, Sukru Serdar
    Study aim: It is well known that substrate oxidation rates are increased by exercise. The present study had two main objectives: firstly, to examine the effect of a single exhaustive exercise session on post-exercise substrate oxidation and energy expenditure; and secondly, to determine the differences between athletes and non-athletes. Material and methods: Eighteen healthy male athletes (mean +/- SD age; 19.38 +/- 2.26 years, VO2max; 60.57 +/- 3.90 ml.kg(-1).min(-1), n = 8) and non-athletes (age; 20.30 +/- 1.26 years, VO2max; 44.97 +/- 5.43 ml.kg(-1).min(-1), n = 10) volunteered to participate in the study. After an overnight fast, subjects performed a single sprint exercise session on a cycle ergometer with individual loads (0.075 kg per body weight) until volitional exhaustion. Energy expenditure (EE) and the substrate oxidation rate were measured at rest and during the post-exercise recovery period using indirect calorimetry. Results: Exhaustive exercise significantly increased post-exercise fat oxidation, energy expenditure and contribution of fat to EE (p < 0.05). Also, it significantly decreased post-exercise carbohydrate (CHO) oxidation and the contribution of CHO to EE (p < 0.05). However, the changes in the substrate oxidation rate and EE after the exercise test were not different between the groups (p > 0.05). Conclusions: The study results suggest that a single short-duration exhaustive exercise session causes a higher fat oxidation rate during recovery than at rest, whereas training status did not affect this situation.
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    ELECTROMYOGRAPHIC CHARACTERISTICS OF THE QUADRICEPS FEMORIS DURING PERFORMANCE OF THE WINGATE TEST
    (UNIV LJUBLJANA, FAC SPORT, 2017) Aslankeser, Zubeyde; Arica, Sami
    The purpose of this study was to investigate the relationship between the Wingate Anaerobic Test (WAT) outputs and the Electromyography (EMG) parameters. Seventeen sedentary college males participated in the study (mean +/- SD, age 20.5 +/- 2.4 y; height 174.2 +/- 4.3 cm; body mass 66.2 +/- 7.6 kg). Surface electromyographic signals of vastus medialis, vastus lateralis and rektus femoris were recorded during WAT. Power, normalized power, cadence, Mean power frequency (MPF) of each muscle and Root Mean Square (RMS) EMG were calculated as 5 s averages. Mean differences in power and cadence, mean EMG frequency and RMS EMG were analyzed by repeated measures one way ANOVA with Bonferroni post hoc adjustment for multiple pairwise comparisons. Pearson's correlation coefficient was used to evaluate the relationship between the WAT performance variables and muscle EMG outputs All data are presented as mean +/- SD. The peak power and cadence decreased significantly (p<0.01). Mean power frequency of all muscles decreased significantly (p<0.01) but REMG did not change during the test duration(p>0.01). There was a correlation between peak power, normalized power, cadence and MPF of the quadriceps muscles also. The results suggest that there was a correlation between mean power frequencies of vastus medialis, vastus lateralis, rectus femoris and WAT performance. The decreases of the peak power and cadence should be related to the decreases of the mean frequencies of the quadriceps muscles.
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    Re-examination of the contribution of substrates to energy expenditure during high-intensity intermittent exercise in endurance athletes
    (PEERJ INC, 2017) Aslankeser, Zubeyde; Balci, Sukru Serdar
    Background. It has been believed that the contribution of fat oxidation to total energy expenditure is becoming negligible at higher exercise intensities (about 85% VO2max). The aim of the present study was to examine the changes in substrate oxidation during high-intensity interval exercise in young adult men. Methods. A total of 18 healthy well-trained (aged 19.60 +/- 0.54 years, BMI = 22.19 +/- 0.64 kg/m(2), n = 10) and untrained (aged 20.25 +/- 0.41 years, BMI = 22.78 +/- 0.38 kg/m(2), n = 8) young men volunteered to participate in this study. After an overnight fast, subjects were tested on a cycle ergometer and completed six 4-min bouts of cycling (at similar to 80% VO2max) with 2 min of rests between intervals. Energy expenditure and the substrate oxidation rate were measured during the experiment by using indirect calorimetry. The blood lactate concentration was collected immediately after each interval workout. Results. The fat oxidation rate during each workout was significantly different between the untrained and the athlete groups (p < 0.05), and the carbohydrate (CHO) oxidation rate during the experiment was similar between groups (p > 0.05). Moreover, lactate concentration significantly increased in the untrained group (p < 0.05), whereas it did not significantly change in the athlete group during the workouts (p > 0.05). Fat contribution to energy expenditure was significantly higher in the athlete group (similar to 25%) than in the untrained group (similar to 2%). Conclusions. The present study indicates that 17 times more fat oxidation was measured in the athlete group compared to the untrained group. However, the athletes had the same CHO oxidation rate as the recreationally active subjects during high-intensity intermittent exercise. Higher fat oxidation rate despite the same CHO oxidation rate may be related to higher performance in the trained group.
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    Substrate oxidation during incremental exercise in young women: the effects of 2-week high intensity interval training
    (EDIZIONI MINERVA MEDICA, 2017) Aslankeser, Zubeyde; Balci, Sukru Serdar
    BACKGROUND: The objective of this study was to investigate the effects of very low volume (in terms of the number of training days and load number in every session) of a high-intensity interval training (HIIT) program on substrate oxidation during incremental exercise until exhaustion in recreationally active women. METHODS: Sixteen young women (N.=8 training; N.=8 controls) voluntarily participated in this study. Before the experiment, peak and mean power outputs were measured by the Wingate Anaerobic Test (WAT), VO2max, the maximal fat oxidation rate (MFO) and Fat(max) intensity and were not different between the groups (P>0.05). The training group completed two weeks of HIIT (10 sessions), including 2 WATs in every training session. RESULTS: After the experiment, peak and mean power, VO2max, exhaustion time and CHOpeak increased in the training group. Nevertheless, the MFO and Fatmax intensity values did not change. CONCLUSIONS: These results demonstrated that a 2-week HIIT increased aerobic and anaerobic capacity without any change in the MFO and Fatmax during maximal exercise.