ABILITY OF MECHANICAL POWER ESTIMATIONS TO EXPLAIN DIFFERENCES IN METABOLIC COST OF WALKING AND RUNNING AMONG CHILDREN

The relationship between metabolic cost and three estimates of mechani cal power was examined for three groups of children. Thirty children, aged 7-8 (n = 10), 10-12 (n = 10) and 15-16 (n = 10) years, performed 4-min bouts of submaximal treadmill exercise at 6 randomly assigned sp eeds, 2 walking and 4 running. When metabolic and mechanical power mea sures were correlated, the two segmental methods were good predictors of VO2 for individuals, but not for groups. When two age groups perfor med the same absolute speed, VO2, was significantly different between groups, but mechanical power and energy transfer rates were not. The l ower metabolic cost of the older children could not be explained by di fferences in mechanical power or energy transfer rates. (C) 1997 Elsev ier Science B.V.