Key result
Higher aerobic fitness levels, as measured by peak O2 uptake to body weight ratio, were significantly and positively correlated with a wider range of isocapnic buffering periods (R=0.76542, p<0.0001).
Cross-Sectional (n=50)
No
Effect estimate: R=0.76542
p-value: p=<0.0001
The range of isocapnic buffering periods during incremental exercise testing is positively correlated with aerobic fitness levels, suggesting it can be used as an additional criterion for evaluating aerobic fitness.
May support ICB range as fitness marker in CPET; hypothesis-generating and requires prospective validation.
The purpose of this study is to examine the relationship between the amount of O2 uptake (VO2) in the range of isocapnic buffering (ICB) periods and aerobic fitness levels of subjects with different exercise tolerance levels. A total of 50 young male subjects (20.8±0.4 years) performed an incremental exercise test using a cycle ergometer to determinetheir anaerobic threshold (AT), respiratory compensation point (RCP) and maximal exercise capacity (Wmax). The ICB period is defined as the region between AT and RCP. Pulmonary gas exchange parameters were measured breath-by-breath using a respiratory gas analyser. The subjects' fitness levels, as indicated by peak O2 uptake to body weight ratios (VO2peak/BW), ranged from 28 ml/min/kg to 58 ml/min/kg, and Wmax capacity to body weight ratio (Wmax/BW) ranged from 1.94 W/min/kg to 3.96 W/min/kg. The VO2 in the range of ICB periodsranged from 101 ml to 793 ml (with an average of 295±157 ml). There was a positive linear correlation between VO2peak/BW, Wmax/BW and range of ICB: R=0.76542 (p<0.0001), and R=0.92135 (p<0.0001), respectively. The results of this study suggest that the range of ICB periods may be related to aerobic fitness. Importantly, aerobic fitness levels should be evaluated and considered important data, in addition toAT, VO2peak/BW and Wmax/BW.
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Algül et al. (2017) conducted a cross-sectional in Healthy (n=50). Aerobic fitness level was evaluated on Correlation between peak O2 uptake to body weight ratio (VO2peak/BW) and the range of isocapnic buffering (ICB) periods (R=0.76542, p=<0.0001). Higher aerobic fitness levels, as measured by peak O2 uptake to body weight ratio, were significantly and positively correlated with a wider range of isocapnic buffering periods (R=0.76542, p<0.0001).
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