365 research outputs found
Efficacy of Flotation Aids Attached to the Pelvis and Thighs of Beginning Swimmers
The study aimed to experimentally verify the efficacy of wearing flotation aids to add buoyancy from the pelvis to the side of the thigh on the swimming performance of beginning swimmers who were capable of swimming around 25 meters at a time. The study recruited seven male university students who were members of the Physical Education Department and who lacked experience in specialized swimming instruction. The study found statistical difference in prone flotation between the use of flotation aids (7.27±1.92 sec) and without flotation aids (3.50±0.72 sec). During swimming for distance in a 5 min. swim test, we found statistical difference between the use of flotation aids (185.0±29.6 m) and without flotation aids (172.6±24.4 m). Moreover, no overall differences in stroke length and stroke rate were observed flotation and no flotation use
Effect of additional buoyancy swimsuits on performance of competitive swimmers
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).
Conclusion:
ABS improves swimming performance by streamlining the horizontal posture.This work is supported by the JSPS KAKENHI, grant number 16K01713.info:eu-repo/semantics/publishedVersio
Effect of Prebending Strain on CuNb/Nb3Sn Superconducitng Coils Using a React and Wind Method
<Abstract of Published Report>The Chalcogeno-Baylis-Hillman Reaction : A New Preparation of Allylic Alcohols from Aldehydes and Electron-deficient Alkenes.
Botulinum Toxin Complex: A Delivery Vehicle of Botulinum Neurotoxin Traveling Digestive Tract
Prebending Strain Effect on CuNb/Nb3Sn Superconducting Wire During Practical React-and-Wind Process
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