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2014, Number 2

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Rev Hosp Jua Mex 2014; 81 (2)

Comparison of modeling techniques used to characterize moderate and heavy phase two recovery Vo2 kinetics in old men

Padilla-Pérez J

Language: Spanish
References: 34
Page: 92-103
PDF size: 272.69 Kb.


ABSTRACT

We kinetically assessed pulmonary oxygen uptake (VO2) off-transient (Post-Exercise Recovery) response during moderate (M)- and heavy (H)-intensity (Sub = M + H) exercise comparing among several common modelling strategies to assess the best fitting exponential model. The parameter estimated for phase 2 VO2 was the time constant (off-τΦ2VO2) in older male adults [n = 9; 72 (±4) yrs; mean (±sd)]. Subjects performed an incremental ramp test (12 W•min-1) to the limit of tolerance to determine VO2peak and the estimated lactate threshold (VET). Constant-load cycle exercise was performed at 50 W (M) and work rates corresponding to 80% (M) and 120% VET (H). Each transition in work rate lasted 6 min and was preceded by 6 min cycling at a baseline of 20 W; transitions at each intensity were repeated 4-6 times. VO2 was measured breath-by-breath. Each subject pedalled at 60 rpm and protocol began with a base line off 1 min end exercise load-cycling, followed by a step decrease in power output (without warning the subject) back to loadless cycling lasting 6 min in duration (PER). Data from each transition were filtered, interpolated to 1 s intervals and ensemble-averaged to yield a single response profile for each subject and intensity. Responses were modelled by means of nonlinear regression techniques with one-(1C), two-(2C) and three-component (time delay) (3C) exponential models using different fitting windows. The off-Φ2VO2 for Sub was both physiologically and stastistically well described and kinetically characterized (off-τ2VO2) by a two component doble exponential function (2C) for M (aτ2 = 56 ± 14 s)-, and by a threecomponent triple exponential function (3C) (bτ2 = 39 ± 7, agbP ‹ 0.05) for H in old men.


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