Abstract
Seven high school boys (16.4 ± 0.5 y,
mean ± SD) and 7 girls (16.4 ± 0.5 y), who
specialized in track and field events, performed ten 5-s maximal sprint runs
with an interval of 10s between each sprint on a non-motorized running
ergometer. In each sprint, the mean mechanical power (MP) from the start until
the belt velocity of the ergometer (i. e., running velocity) peaked was
calculated. The boys showed significantly higher MP than the girls in all
sprints. However, when MP was expressed as the ratio to the total volume of
muscles located in the right lower limb
(MP × MV-1), estimated using a bioelectrical
impedance analysis, significant gender effect was limited to the values at the
1st and 2nd sprints. The decline of MP over the ten
sprints, expressed as a relative value to that at the 1st sprint,
was greater in boys (46.2 ± 7.6 %) than in
girls (33.9 ± 8.6 %), and significantly
correlated with MP × MV-1 at the 1st
sprint (r = 0.568, p < 0.05). However, no
significant difference between the boys and girls was found in the relative
difference between MP values at the 3rd and 10th sprints,
where the gender difference in MP × MV-1 at
every sprint was insignificant. The findings here indicate that, for trained
teenage boys and girls, 1) significant gender difference in mechanical power
developed during repeated bouts of maximal running exists only in the initial
phase of the task, when the difference in the volume of the lower limb muscles
is normalized, and 2) it may be a reason for a greater decline of mechanical
power developed during the bout in boys compared to girls.
Key words
Non-motorized treadmill - anaerobic power - track and field athletes - bioelectrical impedance
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H. Kanehisa, Ph. D.
Department of Life Sciences (Sports Sciences) · University
of Tokyo
3-8-1 Komaba Meguro-ku · Tokyo · Japan
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