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Advisor(s)
Abstract(s)
When in water, the Centers of Buoyancy (CoB) and Mass (CoM) of the human body are positioned cranially and caudally, respectively. With
increasing distance between these centers, the sinking torque of the lower limbs increases, with a subsequent decrease in swimming performance
due to increased drag.
Objective:
To clarify the effect of additional buoyancy swimsuits on swimming performance.
Methods:
The subjects were eight competitive male swimmers of mean ±SD age 21±2 years. Swimming performance was compared between Conventional
(CS) and Additional Buoyancy Swimsuits (ABS). CoM and CoB were identified on land and in water, respectively, with the swimmers
maintaining a horizontal posture. CoM was measured by the reaction board method. CoB was calculated as the force exerted in the vertical
direction accompanied by changes in inspiratory volume. Swimming velocity and Blood Lactate (BL) concentration value during 200 m front
crawl in trials at four different speeds (curve test) were recorded as swimming performance.
Results:
No significant difference in inspiratory volume was observed between CS and ABS (small effect size, d=0.28). The distance between CoM and
CoB was significantly shorter for CS than ABS (p < 0.001; large effect size, d=1.08). Both swimming velocity at BL of 4 mmol·L-1 and maximal
effort were significantly faster for ABS (p < 0.042; 0.008), with large effect size (d=0.91; 0.98). However, there was no significant difference in
maximal BL between CS and ABS (small effect size, d=0.37).
Description
Keywords
Swimming velocity Horizontal posture Blood lactate Center of mass Center of buoyancy Water resistance
Pedagogical Context
Citation
Moriyama, Shin-Ichiro; Watanabe, Yasunori; Kurono, Tsubasa; Morais, J.E.; Marinho, D.A.; Wakayoshi, Kohji (2021). Effect of additional buoyancy swimsuits on performance of competitive swimmers. Open Sports Sciences Journal. ISSN 1875-399X, 14:1, p. 98-105
Publisher
Bentham Science Publishers