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Advisor(s)
Abstract(s)
The purpose of this study was to examine the
relationship between the intra-cycle variation of the
horizontal velocity of displacement (dV) and the energy
cost (EC) in butterfly stroke. Five Portuguese national
level swimmers performed one maximal and two submaximal
200-m butterfly swims. The oxygen consumption
was measured breath-by-breath by portable metabolic
cart. A respiratory snorkel and valve system with
low hydrodynamic resistance was used to measure pulmonary
ventilation and to collect breathing air samples.
Blood samples from the ear lobe were collected before
and after each swim to analyse blood lactate concentration.
Total energy expenditure (Etot) and EC were
calculated for each swim. The swims were videotaped in
the sagittal plane with a set of two cameras providing
dual projection from both underwater and above the
water surface. The APAS system was used to analyse dV
for the centre of mass. The Etot increased linearly with
the increasing V, presenting a significant correlation
coefficient between these parameters (r=0.827,
P<0.001). The increase in EC was significantly associated
with the increase in the dV (r=0.807, P<0.001).
All data were presented as the mean value and the
standard deviation. It is concluded that high intra-cycle
variation of the velocity of the centre of mass was related
to less efficient swimming and vice versa for the butterfly
stroke.
Description
Keywords
Butterfly Centre of mass Energy cost Velocity fluctuation
Citation
Barbosa, Tiago M.; Keskinen, K.L.; Fernandes, R.J.; Colaço, P.; Lima, A.B.; Vilas-Boas, J.P. (2005). Energy cost and intracyclic variation of the velocity of the centre of mass in butterfly stroke. European Journal of Applied Physiology. ISSN 1439-6319. 93:5-6, p. 519-523
Publisher
Springer