Evaluation of the relationship between aerobic and anaerobic performance and muscle fiber types

The purpose of this study is to comprehensively evaluate the relationship between aerobic and anaerobic performance and muscle fiber type in healthy 49 young men. Aerobic/anaerobic capacity and isokinetic strength measurements were performed. Participants were divided into two groups according to their maximal oxygen consumption capacity (VO₂max) values: Group 1 (VO₂max ≤ 36.7 mL/kg/min, n = 24) and Group 2 (36,8 ≤ VO₂max < 41 mL/kg/min, n = 25). As a result of the analysis, moderate positive correlations were found between the extensor fatigue index (Yİeks%) from isokinetic strength parameters and aerobic performance parameters (r = 0.427**, r = 0.597**, r = 0.680**); similarly, moderate positive correlations were identified between the flexor fatigue index (Yİfle%) and aerobic parameters (r = 0.379**). Significant differences were observed between the groups in Yİeks% (p = 0.00) and Yİfle% (p = 0.01) values. Additionally, statistically significant differences were detected between the groups in terms of relative anaerobic threshold (AEr) (p = 0.02*), relative ventilatory threshold (VEr) (p = 0.00***) and VO₂max (p = 0.00***). In contrast, no significant relationship was found between anaerobic test results and isokinetic strength parameters (p > 0.05). In conclusion, it is observed that the isokinetic strength values determined through the isokinetic test performed with 50 repetitions at an angular velocity of 180°·s⁻¹ are largely influenced by neuromuscular and/or morphological factors associated with maximal aerobic capacity.