The Influence of Increased Body Fat or Lean Body Mass on Aerobic Performance

PURPOSE The purpose of this study was to determine aerobic performance in men with an increased body mass due to (a) high body fat (>21.5%) but with a average (59.0-64.3 kg) lean body mass (HBF group) and (b) high lean body mass (>66.3 kg), but with average body fat (14.0-18.5%) (HLBM group). METHODS The men in the HBF and HLBM had similar absolute body mass and body mass index (BMI). The aerobic performance was also determined in control group. Methods: Study participants comprised 39 men aged 21.3 ± 1.9 years who did not participate in competitive sports but were recreationally physically active. Participants were divided into three groups. Each group comprised 13 persons. The study involved anthropometric measurements, assessing aerobic performance (VO2max) using an incremental test on a mechanical treadmill. VO2max was expressed in absolute values, relative to body mass (VO2max ⋅ BM(-1)), relative to lean body mass (VO2max ⋅ LBM(-1)), and relative to BM raised by the exponents of 0.75 and 0.67. Body composition was measured using bioelectrical impedance analysis. RESULTS No statistically significant differences in relative values of VO2max were found between the HBF and HLBM groups, in VO2max ⋅ BM(-1) (50.24 ± 4.56 vs. 53.11 ± 5.45 mL ⋅ kg(-1)), VO2max ⋅ LBM(-1) (65.33 ± 5.63 vs. 63.86 ± 7.13 mL ⋅ kgLBM(-1)), and VO2max ⋅ BM(-0.75) (150.29 ± 13.5 vs. 160.39 ± 16.15 mL ⋅ kg(-0.75)). Values of VO2max ⋅ BM(-1) were significantly lower in the HBF and HLBM groups than in the control group (58.23 ± 5.84 mL ⋅ kg(-1)). CONCLUSION High body mass, regardless of the cause decreases VO2max ⋅ BM(-1).