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2010, Number 4

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Rev Hosp Jua Mex 2010; 77 (4)

Slow age-related phase II on-transient VO2 and heart rate kinetics during ramp exercise in adult men

Padilla PJ

Language: English
References: 37
Page: 245-254
PDF size: 239.13 Kb.


ABSTRACT

We assessed for differences of the phase II cardiopulmonary (φII CRP) on-transient kinetics in terms of mean response time (MRT, s) for the expired ventilation (MRT Ve), pulmonary oxygen uptake (MRT VO2), carbon dioxide output (MRT VCO2) and heart rate (MRTHR) and also did the φII VO2 on-transient kinetics degree of entropy (φII VO2 MRT S, kcal•°C-1•s-1), between young (YG = 8, 25 ± 2.9; mean ± SD) and old adult men (OG = 9, 70.9 ± 4.7) men during legs cycling exercise computerized ramp test (YG: 25W•min-1; OG: 15W•min-1), in the search for determinant mechanisms or factors possibly involved in the VO2 kinetics of adult men. The provided breath-by-breath pulmonary data and the beat-by-beat data were modelled by non linear regression. We observed ramp slow (MRT difference=OG - YG, s) φII on-transient age-related for both VO2 (23 s) and HR kinetics (30 s), and also increased age-related φII VO2 MRT S (3.1 kcal•°C-1•s-1) for ramp exercise. The ramp test on-transient phase two of both the slow VO2 kinetics and slow HR kinetics were age- related, and they were accompanied by an increased VO2 kinetics entropy for ramp exercise, meaning that old adults could thermodynamically resists less the energy-transitions and thus increase their entropy in terms of kcal•°C-1•s-1. The amount of heat energy un-available for conversion into useful work (S) in the human body increases with ageing, and the human body does it with ageing by slowing down both the pulmonary O2 uptake and the heart rate ontransient kinetics during ergometric exercise.


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