Effects of low and high intensity interval training exercises on VO2max and components of neuromuscular and vascular system in male volunteers.

OBJECTIVES: To evaluate the effects of different intensity exercises on maximal oxygen consumption (VO2max and levels of components, namely brain-derived neurotrophic factor (BDNF), tyrosine kinase receptor B (TrKB), vascular endothelial growth factor (VEGF), peroxisome proliferator activated receptor-gamma coactivator (PGC-1α), and irisin. METHODS: Thirty-six male participants were divided into control (CNT), low-intensity (LIIT), and high-intensity interval training (HIIT) groups. LIIT and HIIT groups consisted of 8 exercises (20 s work and rest in each repetition, respectively) conducted for 4 weeks. VO2max and protein component levels were determined pre- and post-training. VO2max capacity was also determined using the Yo Yo Intermittent Recovery Test-1 (Yo Yo IR-1). Statistical analysis was conducted to determine significance of the differences observed. RESULTS: According to the YoYo IR-1, VO2max, serum BDNF, VEGF, PGC1α, irisin, and TrkB data obtained in the study, a statistically significant difference between the groups was observed (p<0.05). While the interaction effect was found to be statistically significant in the study using PGC1α, VEGF, and TrkB data (p<0.05), it was not found to be statistically significant using YoYo IR-1, VO2max, serum BDNF, or irisin data (p>0.05). CONCLUSION: HIIT and LIIT improved all study parameters, while HIIT showed a greater effect than LIIT.

The clinical effects of somatotype difference on isokinetic knee muscle strength and dynamic balance scores.

OBJECTIVES: The aim of this study was to present the somatotype features of young individuals without any symptoms and to identify whether isokinetic knee muscle strength and dynamic balance scores are affected by somatotype difference. PATIENTS AND METHODS: A total of 146 participants (88 males, 58 females; mean age 22.5±1.9 years; range 19 to 28 years) who had no symptoms were included in this study. Somatotypes of the participants were calculated using the Heath-Carter formula, and anthropometric measurements were taken from each participant. Knee flexion and extension muscle strengths at angular speeds of 90°/sec, 120°/sec and 150°/ sec were measured from the dominant and non-dominant limbs of the participants. Total balance, anterior/posterior balance, and medial/ lateral measurements were made to evaluate dynamic balance performances. RESULTS: Six different somatotypes were found. Endomorphic mesomorph was the most common somatotype in 56 participants. There was no significant somatotype difference in men and women for dominant and non-dominant knee extension and flexion peak strength values at angular speeds of 90°/sec, 120°/sec and 150°/sec (p>0.05). No significant difference was found between the balance scores of men and women who had different somatotypes (p>0.05). CONCLUSION: Anatomic structure of the body, which is suitable for the sports branch, has an increasing effect on performance.