스컬링 수행 시 손바닥 각도에 따른 항력, 양력의 변화 및 역학적 요인 분석

Abstract

In this study, the researcher tried to analyse the effects of various angles in sculling on the variation of lift, drag and underwater weighting and suggest the most efficient sculling method through 3-dimensional motion analysis. An experiment was conducted on the study subjects of 14 males with life guard licences issued by the Korean Red Cross, living in B district with their spontaneous consent after explaining the purpose and method of this study sufficiently. The Computational Fluid Dynamics program was performed with 5 different angles of 0°, 15°, 30°, 45° and 60° in total, based on the mean data collected from males in their twenties from a survey on the anthropometric data of the Koreans. The effects of various angles in sculling on lift, drag and underwater weighting and 3-dimensional motion analysis are as follows; 1. The underwater weighting in sculling gradually decreased with the increasing angle of the palm from 0° to 45 during sculling ( p< .001)°.

2. The lift and drag values in sculling gradually increased with the increasing angle of the palm, however, the drag value greatly increased from 45°, while lift decreased from 60°.

3. It took 1.61 sec. to perform the sculling and the variation of angle of the elbow showed 22.86° in the left and 15.48° in the right in P1 section, while 21.95° in the left and 21.77° in the right in P2 section. On the other hand, the variation of angle of the shoulder showed 13.93° in the left and 12.82° in the right in P1 section, while 16.05° in the left and 12.46° in the right in P2 section.

Overall, it is concluded that the optimal efficiency of sculling can be achieved at the angles 15° and 30°.

Though sculling movements were analyzed by collecting anthro- pometric data through Computational Fluid Dynamics program and 3-dimensional motion analysis, it is a little limited that we generalize the result drawn from variation of underwater weighting depending on the angles as an actual lift value, which warrants further studies on the measuring of overall swimming movement of rotary kick of our lower body as well as sculling, along with various subjects.