Accumulated oxygen deficit increases with inclination of uphill running

Abstract

This study examined whether accumulated oxygen deficit depends on treadmill grade during uphill running. Oxygen uptake was measured during steady-state submaximal running. By linear extrapolation at each grade, energy demand was estimated for short exhaustive runs. Oxygen deficit was the difference between this estimate and accumulated oxygen uptake. Six subjects ran at grades of 1, 15, and 20% (study I), and five males trained for anaerobic metabolism ran at 1, 10.5, and 15% (study II). Accumulated oxygen deficit was 40 +/- 11 (SD), 72 +/- 20, and 69 +/- 8 ml O2/kg, respectively (study I), and 57 +/- 8, 78 +/- 10, and 100 +/- 7 ml O2/kg (study II). The finding that accumulated oxygen deficit became larger with treadmill inclination could reflect involvement of an increasing muscle mass. However, variation in accumulated oxygen deficit was too large to make this possibility the only explanation. More likely at small treadmill inclinations energy demand for high-intensity running is underestimated by extrapolation from oxygen uptake during submaximal exercise. At high grades of uphill running, accumulated oxygen deficit reached a maximum that may reflect the subjects' anaerobic capacity for running. This hypothesis was substantiated by an enhanced accumulated oxygen deficit in the anaerobically trained subjects during 15%, but not during 1%, uphill running.

Inclusão do equivalente energético do lactato na regressão VO2-intensidade em corrida horizontal e inclinada (10,5%)

“…For each subject, an alternative regression model was established, where an energy equivalent of 3 ml ] accumulation is expected to rise more with incremental inclined grade running, we hypothesized that the [La -] energy equivalent when added to the VO 2 measurements during running exercise would greatly in uence the 10.5% grade running, when compared with level running. It has been shown that grade running demands a high energy turnover 10 , possibly due to a poor running economy 11 . Inclined running imposes a di erent mechanical pattern 12 , as compared with level running and the former pattern relies more on concentric muscle contractions.…”

“…However, it also is apparent that within subjects heavy to severe exercise intensities -such as during an incremental test to exhaustion -eventually lead to increases in total (aerobic + anaerobic) energy costs that are not proportional to increases in work 9 . It is well established that grade running demands a high energy turnover 10 possibly due to a worsening running economy 11 and imposes a different mechanical pattern 12 , as compared with level running. e original studies by M et al [4][5] involved both level and grade treadmill running.…”

Déficit Máximo Acumulado De Oxigênio: Uma Breve Revisão Histórica E Metodológica

“…De forma similar, Olesen (1992) constatou que o MAOD de atletas e do grupo-controle era aproximadamente 88 a 92% maior durante a corrida na esteira com a inclinação entre 15 e 20%, quando comparado à inclinação de 1%. Além disso, as diferenças entre esses dois grupos só foram significativas a partir da inclinação de 15%.…”

“…Segundo esse pesquisador, a redução da eficiência na corrida durante a subida se deve à queda na proporção entre as ações excêntricas e concêntricas realizadas nessa situação, a qual diminuiria a capacidade do músculo esquelético de armazenar energia elástica. Não obstante, naquela ocasião Olesen (1992) não realizou medidas que permitissem sustentar essa relação causal. Bangsbo et al (1993) Com o propósito de testar diretamente a hipótese da influência da massa muscular sobre o MAOD, Sloniger et al (1997) mensuraram a quantidade de massa muscular por meio de imagem de ressonância magnética e do MAOD durante a corrida horizontal ou com a inclinação de 10% na esteira.…”

Acute effect of uphill running: current scenario and future hypotheses

“…[12][13][14][15][16] Variable slope uphill running is capable of imposing different relationships between the application of concentric and eccentric forces during the running cycle.…”