Phase angle is associated with muscle endurance and estimated maximum oxygen uptake in healthy young males

[Purpose] This study aimed to clarify the utility of Phase Angle by examining its relationship with muscle endurance and whole-body endurance in healthy young Japanese males. [Participants and Methods] This cross-sectional exploratory study included 24 healthy young male participants, aged 19.1 ± 0.3 years. Body composition by Bioelectrical impedance analysis, including whole body Phase Angle, was measured. To assess the muscle endurance of the quadriceps femoris and hamstrings, participants performed a test using an isokinetic dynamometer. The angular velocity was set at 180°/sec, a standard velocity used in endurance assessments. Oxygen uptake and heart rate were measured during a multistage continuous treadmill test, and maximum oxygen uptake was estimated by calculating a linear regression equation based on the relationship between heart rate and oxygen uptake. Pearson's product-moment correlation analysis was performed to examine associations between Phase Angle, maximum oxygen uptake, and isokinetic measurement variables. [Results] Only Phase Angle showed significant correlations with extension 180°/sec maximum peak torque/body mass (%), muscle fatigue, and maximum oxygen uptake. [Conclusion] These results suggest that Phase Angle can be identified as a potential marker associated with muscle and whole-body endurance in young, healthy Japanese men. Phase Angle measurements may offer valuable insights for assessing physical condition in this population.