Comparação entre diferentes métodos de análise do componente lento do consumo de oxigênio: uma abordagem no domínio muito intenso de exercício

Santana, Marcos Gonçalves de; Tufik, Sérgio; Passos, Giselle Soares; Santee, Donald Mark; Denadai, Benedito Sérgio; Mello, Marco Túlio de

doi:10.1590/s1517-86922007000400006

Cited by 2 publications

(2 citation statements)

References 23 publications

(46 reference statements)

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“…(VO 2peak : 49 ± 3 ml*min −1 *kg, see Table 1 for the other characteristics) [1], and presented an overall metabolic response to constant load exercise consistent with previous studies (e.g. no VO 2sc in the moderate domain; VO 2sc in heavy +4.2 ± 3.4% tending to steady-state; VO 2sc in severe domain +11.4 ± 4.9% tending to VO 2max ) [17,25,29].…”

Section: Discussionsupporting

confidence: 83%

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Bioenergetics of the VO2 slow component between exercise intensity domains

Colosio

Caen

Bourgois

et al. 2020

Pflugers Arch - Eur J Physiol

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During heavy and severe constant-load exercise, VO2 displays a slow component (VO2sc) typically interpreted as a loss of efficiency of locomotion. In the ongoing debate on the underpinnings of the VO2sc, recent studies suggested that VO2sc could be attributed to a prolonged shift in energetic sources rather than loss of efficiency. We tested the hypothesis that the total cost of cycling, accounting for aerobic and anaerobic energy sources, is affected by time during metabolic transitions in different intensity domains. Eight active men performed 3 constant load trials of 3, 6, and 9 min in the moderate, heavy, and severe domains (i.e., respectively below, between, and above the two ventilatory thresholds). VO2, VO2 of ventilation and lactate accumulation ([La−]) were quantified to calculate the adjusted oxygen cost of exercise (AdjO2Eq, i.e., measured VO2 − VO2 of ventilation + VO2 equivalent of [La−]) for the 0–3, 3–6, and 6–9 time segments at each intensity, and compared by a two-way RM-ANOVA (time × intensity). After the transient phase, AdjO2Eq was unaffected by time in moderate (ml*3 min−1 at 0–3, 0–6, 0–9 min: 2126 ± 939 < 2687 ± 1036, 2731 ± 1035) and heavy (4278 ± 1074 < 5121 ± 1268, 5225 ± 1123) while a significant effect of time was detected in the severe only (5863 ± 1413 < 7061 ± 1516 < 7372 ± 1443). The emergence of the VO2sc was explained by a prolonged shift between aerobic and anaerobic energy sources in heavy (VO2 − VO2 of ventilation: ml*3 min−1 at 0–3, 0–6, 0–9 min: 3769 ± 1128 < 4938 ± 1256, 5091 ± 1123, [La−]: 452 ± 254 < 128 ± 169, 79 ± 135), while a prolonged metabolic shift and a true loss of efficiency explained the emergence of the VO2sc in severe.

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Section: Discussionsupporting

confidence: 83%

“…VO 2sc was calculated as the sum of the amount of oxygen exciding the VO 2 reached at the end of the 0-to-3-min time segment [25].…”

Section: Constant Load Trialsmentioning

confidence: 99%

Bioenergetics of the VO2 slow component between exercise intensity domains

Colosio

Caen

Bourgois

et al. 2020

Pflugers Arch - Eur J Physiol

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Blood lactate accumulation decreases during the slow component of oxygen uptake without a decrease in muscular efficiency

O'Connell

Weir

MacIntosh

2017

Pflugers Arch - Eur J Physiol

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Pulmonary oxygen uptake ([Formula: see text]) slowly increases during exercise above the anaerobic threshold, and this increase is called the slow component of [Formula: see text]. The mechanism of the increase in [Formula: see text] is assumed to be due to increasing energy cost associated with increasingly inefficient muscle contraction. We hypothesized that the increase in [Formula: see text] would be accompanied by a constant or increasing rate of accumulation of blood lactate, indicating sustained anaerobic metabolism while [Formula: see text] increased. Ten male subjects performed cycle ergometry for 3, 6, and 9 min at a power output representing 60% of the difference between lactate threshold and maximal [Formula: see text] while [Formula: see text] and blood lactate accumulation were measured. Blood lactate accumulation decreased over time, providing the energy equivalent of (mean ± SD) 1586 ± 265, 855 ± 287, and 431 ± 392 ml of [Formula: see text] during 0-3, 3-6, and 6-9 min of exercise, respectively. As duration progressed, [Formula: see text] supplied 86.3 ± 2.0, 93.6 ± 1.9, and 96.8 ± 2.9% of total energy from 0 to 3, 3 to 6, and 6 to 9 min, respectively, while anaerobic contribution decreased. There was no change in total energy cost after 3 min, except that required by ventilatory muscles for the progressive increase in ventilation. The slow component of [Formula: see text] is accompanied by decreasing anaerobic energy contribution beyond 3 min during heavy exercise.

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Comparação entre diferentes métodos de análise do componente lento do consumo de oxigênio: uma abordagem no domínio muito intenso de exercício

Cited by 2 publications

References 23 publications

Bioenergetics of the VO2 slow component between exercise intensity domains

Bioenergetics of the VO2 slow component between exercise intensity domains

Blood lactate accumulation decreases during the slow component of oxygen uptake without a decrease in muscular efficiency

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