Relationship between V’O2peak and cardiorespiratory kinetics in groups of different exercise capacity

Jessica Koschate, Uwe Drescher, Uwe Hoffmann

Publikation: Beitrag in Buch/Bericht/KonferenzbandKonferenzbeitrag - Abstract in KonferenzbandForschungBegutachtung


Introduction A significant relationship between cardiorespiratory kinetics and peak oxygen uptake (V’O2peak) is assumed. Cardiorespiratory kinetics are one of the factors determining V’O2peak. Using pseudo random binary sequences (PRBS) as a moderate work rate pattern combined with cross correlation functions (CCF), kinetic assessment can be reduced to a single test session, contrary to other kinetic test procedures. By use of a backward calculation method (BCM), muscular V’O2 (V’O2musc) can be calculated. Especially in populations where V’O2peak tests could be risky or time is restricted, short, submaximal, reliable tests are important. To evaluate BCM using PRBS and CCF, groups with different exercise capacities were tested. It was assumed that V’O2peak would show a correlation with cardiorespiratory kinetics. Method 26 active young (AY) (age: 31.1±8.3 years; weight: 71.9±12.5 kg), 12 active middle aged (AMA) (age: 48.3±4.3 years; weight: 76.6±15.7 kg) and 29 inactive elderly (IE) (age: 72.5±2.8 years; weight: 82.2±9.2 kg) subjects were tested for V’O2peak and cardiorespiratory kinetics on a bicycle ergometer. For assessment of cardiorespiratory kinetics PRBS WR patterns in combination with CCF were applied. Higher peaks in CCF imply faster system responses (Hoffmann et al., 2013). To control for effects of age on V’O2peak, the percentage of target V’O2peak (%targetV’O2peak), considering age and bodyweight, was calculated. Correlations were calculated two-tailed via Spearman-Rho, stepwise linear regression was applied as well. Results The AY, AMA and IE subjects achieved 158.23±24.2%, 113.7±17.8% and 69.6±13.3% of target V’O2peak, respectively. Mean CCFpeaks for AY were 0.45±0.12 for heart rate (Hpeak); 0.33±0.07 for respiratory V’O2 (Rpeak) and 0.41±0.07 for V’O2musc (Mpeak). Hpeak for AMA was 0.37±0.09, for Rpeak 0.39±0.15 and 0.37±0.1 for Mpeak. For IE Hpeak was 0.32±0.11, Rpeak 0.3±0.1 and Mpeak was 0.32±0.07. A significant correlation with %targetV’O2peak was calculated for the peaks of R, M and H (r=0.383, p=0.001; r=0.557, p<0.001; r=0.439, p<0.001). Performing a stepwise linear regression, including Hpeak and Mpeak as independent and %targetV’O2peak as dependent variable, Mpeak showed the most important influence (p<0.001). Discussion The results show that the developed method to assess cardiorespiratory kinetics correlates well with V’O2peak in groups of different exercise capacity. The calculated value Mpeak shows the most important influence on V’O2peak.The applied test leads to the opportunity to estimate some influencing factors of exercise capacity irrespective of the subjects maximal effort or motivational aspects. References Hoffmann, U., Drescher, U., Benson, A. P., Rossiter, H. B., & Essfeld, D. (2013). Europ J Appl Physiol, 113(7), 1745–1754.
TitelEuropean College of Sport Science
PublikationsstatusVeröffentlicht - 2014