The aim of this study will be to examine the relationship between leg muscle mass and muscle strength, aerobic capacity, anaerobic power, and jumping performance in young adults. In addition, these physical performance measures will be compared between male and female participants.
Recreationally active young adults will be recruited to participate in the study. Body weight and leg muscle mass will be assessed using a body composition analyzer. Participants will perform isokinetic and isometric leg strength tests, an aerobic fitness test (VO₂max), an anaerobic power test (Wingate), and a countermovement jump (CMJ) test.
This study aims to improve the understanding of the effects of leg muscle mass on physical performance and to identify possible differences between males and females. The findings are expected to contribute to exercise prescription, performance assessment, and future research in sports and health sciences.
absent of lower body injuries that could impact testing;
were moderately physically active
did not ingest ergogenic aids or stimulant drugs for at least 6 months prior to the start of the study.
None
Single group
Physical Performance Assessment
Other interventionMuscle Isokinetic Strength Testing, Leg Muscle Mass, and Aerobic and Anaerobic Performance Testing, Contermovement Jump
Leg Muscle Mass-Related Physical Performance Measures
Measurement tool: Bioelectrical Impedance Analyzer (InBody 270, Biospace Co., South Korea) Description: Segmental lower-limb muscle mass (kg) measured using multi-frequency bioelectrical impedance analysis. Unit: kg Time Frame: Baseline (single assessment)
Muscle Isokinetic Strength
Measurement tool: Isokinetic dynamometer (Humac Norm, Computer Sports Medicine Inc., USA) Description: Peak torque of dominant leg knee flexors and extensors measured at 60°·s-¹ and normalized to body weight. Unit: Nm·kg-¹ Time Frame: Baseline
Anaerobic Power
Measurement tool: Wingate Anaerobic Test performed on cycle ergometer (Wattbike WPM Model B, UK) Description: Relative peak anaerobic power calculated during 30-s Wingate test and normalized to body weight. Unit: W·kg-¹ Time Frame: Baseline
Countremovement Jump
Measurement tool: SmartJump contact mat system (Fusion Sport, Queensland, Australia) Description: Vertical jump height measured during the Countermovement Jump test. Jump height is calculated automatically from flight time using the SmartJump performance measurement system. Scale description: Countermovement Jump Height (centimeters). Typical physiological range in healthy young adults is approximately 10-60 cm. Interpretation: Higher values indicate better lower-body explosive performance. Unit: cm Time Frame: Baseline (up to 8 weeks)
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