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2007, Number 4

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Rev Hosp Jua Mex 2007; 74 (4)

Determinación de la cinética de la fase dos transitoria de la VO2 durante ejercicio de carga constante de intensidades moderada e intensa en hombres jóvenes

Padilla PJ, Kowalchuk JM, Taylor AW, Paterson DH

Language: Spanish
References: 44
Page: 231-244
PDF size: 333.47 Kb.


ABSTRACT

The analysis of the phase two pulmonary O2 uptake (Φ2 VO2) on-transient response (OTR) during moderate (MOD)- and heavy (HEAVY)-intensity constant-load exercise (E) was assessed, in young healthy male volunteers (YHM, n = 8; mean ± SD: 25 ± 3 yrs). YHM completed an initial incremental ramp test t (25 W min-1) to volitional fatigue from which the ventilatory threshold (VET) and work rates corresponding to 80%VET (MOD) and 120%VET (HEAVY) were identified. Also, a work rate of 50 W (MOD) was selected. Steptransitions in work rate (4 to 6, lasted 6 min) were initiated from a baseline of 15 W without warning to the volunteers. The VO2 data was measured breath-by-breath at baseline and throughout each transition; they were filtered, interpolated to 1-s intervals and ensemble-averaged to yield a single response profile (SRP) for each volunteer and intensity. The SRP for each volunteer was fit with a one-(1C), two- (2C), and three-component (3C) exponential model (EMM) by using different fitting windows (→), and parameter estimates (time constant, T) were determined for each component. Best fitting (BF) EMM was identified based on the Fisher’s test and/or parameter’s physiological meaning. The 1C,4Paramiters 0.3333 min → 3 min provided the BF for the intra →2 VO2 MOD and HEAVY (T2 = 25 → 8 s); 2C,7PBase Line_Start →End Erercise, did BF for MOD (T2 = 26 ± 11 s) and 3C,10PBase Line_Start → End Exercise, did BF for HEAVY (T2 = 28 ± 19 s) Φ2Aisolated VO2 (T2Overall = 25.6 ± 13 s). The BF_EMMs were those isolating Φ2 VO2 OTR kinetics (T2) for submaximal E in YHM.


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