科研之友
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摘要
Pulmonary oxygen uptake ((V) over dotO(2)) kinetics and heart rate kinetics are influenced by age and fitness. Muscular (V) over dotO(2) kinetics can be estimated from heart rate and pulmonary (V) over dotO(2). In this study the applicability of a test using pseudo-random binary sequences in combination with a model to estimate muscular (V) over dotO(2) kinetics was tested. Muscular (V) over dotO(2) kinetics were expected to be faster than pulmonary (V) over dotO(2) kinetics, slowed in aged subjects and correlated with maximum (V) over dotO(2) and heart rate kinetics. 27 elderly subjects (73 +/- 3 years; 81.1 +/- 8.2 kg; 175 +/- 4.7 cm) participated. Cardiorespiratory kinetics were assessed using the maximum of cross-correlation functions, higher maxima implying faster kinetics. Muscular (V) over dotO(2) kinetics were faster than pulmonary (V) over dotO(2) kinetics (0.31 +/- 0.1 vs. 0.29 +/- 0.1 s; p = 0.004). Heart rate kinetics were not correlated with muscular or pulmonary (V) over dotO(2) kinetics or maximum (V) over dotO(2). Muscular (V) over dotO(2) kinetics correlated with maximum (V) over dotO(2) (r = 0.35; p = 0.033). This suggests, that muscular (V) over dotO(2) kinetics are faster than estimates from pulmonary (V) over dotO(2) and related to maximum (V) over dotO(2) in aged subjects. In the future this experimental approach may help to characterize alterations in muscular (V) over dotO(2) under various conditions independent of motivation and maximal effort.
- 出版日期2016-6
