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2011, Number 1

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Rev Hosp Jua Mex 2011; 78 (1)

Pulso de oxígeno y su cinética de la fase dos transitoria durante una prueba de esfuerzo máximo de VO2 en adultos mayores

Padilla PJ

Language: Spanish
References: 24
Page: 6-11
PDF size: 82.45 Kb.


ABSTRACT

Material and methods. We evaluated in the adult male kinetic (MeanResponseTime in s) differences during the on transient phase II O2 pulse (PulO2 = VO2/HeartRate, mL/heartbeat; ΦΙΙ TRM PulO2) among young (YG = 8, 25 ± 3, mean ± SD) and old (OG = 9, 70.9 ± 5) adult men, who performed a computed test ramp cycle ergometer exercise using both legs. PulO2máx was calculated from the pulmonary data breath-by-breath of VO2 and beat-by-beat of HR, and also the transient ramp ΦII PulO2 data was modeled using nonlinear regression. Results. The PulO2máx was lower (P ‹ 0.05) in OG (13.84 ± 1.92) compared with YG (19.64 ± 2.71). There was no significant difference (P › 0.05) in the kinetic transient ramp ΦΙΙ TRM PulO2 between YG (ΦΙΙ TRM PulO2 = 33.14 ± 10.74) and OG (ΦΙΙ TRM PulO2 = 44.39 ± 12.47). Conclusions. A lower PulO2máx related with age during ramp exercise is interpreted as a probable result of decreased stroke volume and/or a failure to increase oxygen extraction in the elderly group. The ΦΙΙ TRM PulO2 appears do not to reflect age-related differences between healthy people of average fitness or greater.


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