Abstract
This study investigated the relationship between endurance performance and several
measures of aerobic, anaerobic, and morphological fitness in 30 girls and 28 boys,
10 to 14 years of age. A multistage treadmill test was used for assessment of V̇O2 max (ml·kg-1min-1) and anaerobic threshold (AT) expressed both in absolute (AT-V̇O2) and relative (% V̇O2 max) terms. Anaerobic capacity (AC) was measured in a 30-s cycling task and expressed
as kpm·kg of body weight -1·min-1. Percent fat was estimated from skinfolds. The correlations between these measures
and 2-km run time were: -0.73, -0.73, -0.50, -0.77, and 0.55 for V̇O2 max, AT-V̇O2, AT-%V̇O2 max, AC, and percent fat, respectively. When entered into a forward selection multiple
regression with run time as the dependent variable, AC accounted for 59.5% of the
variance and V̇O2 max accounted for an additional 6.9%, with AT and percent fat making no significant
additional contribution. When the girls and boys were compared, no reliable differences
were found for run time and AC. The boys exhibited reliably higher values for V̇O2 max and AT-V̇O2. No reliable difference in percent fat was found for the younger boys and girls,
but the older girls were significantly fatter than the older boys. Thus, in children
10 to 14 there is a substantial relation between measures of anaerobic and aerobic
function, although to some extent they provide independent information about endurance
performance. Additionally, the submaximal measure of AT (AT-V̇O2) is just as effective as V̇O2 max in accounting for variance in endurance performance. Thus, AT(AT-V̇O2), which can be determined without pushing the child to maximal effort, should be
considered for studies in which repeated measures of physiologic function are necessary
but one is hesitant to subject the children to repeated maximal tests.
Key words
maximal oxygen consumption - anaerobic threshold - body composition - anaerobic capacity
