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RISS 인기검색어
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- 저자 : 박영명(YoungMyungPark) (검색결과 2 건)
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자연과학편 : TENNIS FOREHAND STROKE 의 동작분석(動作分析)
윤공화(KongWhaYun),박영명(YoungMyungPark),장진우(JinWooJang),장인석(InSukJang),김종환(JongHwanKim) 한국체육학회 1989 한국체육학회지 Vol.28 No.2
The purpose of this is aimed at improving the skill and technique at tennis play by engaging in a analysis from cinematography taken by 16mm high speed camera, over areas ranging to the stick picture of racket, variation of the velocity at a swing, the velocity of racket at a impact, the angle of the elbow Joint, and impact’s force.The results were as follows:1. The stick picture of racket at a swing were observed by the two; one is way of swinging by sticking a lot forword the racket while drawing a grip end and the other was also Jutting out the racket head at last step. It seems that the latter is more ideal.2. The velocity variation of racket at a swing was increased as approaching to the impact position and the impact was watched to be made at the spot near to the maximum speed.3. The velocity of raket at impact showed that the everage velocity of teh rising hall(17.99m/sec) was lower value than that of top ball(19.85m/sec) and this showed signigficant difference statistically.4. The angle of elbow Joint at impact showed that the everage angle of the rising ball(149.28degree) was higher value than of top ball(146.67degree) but it was not in significance5. The impact force at impact showed that the everage impact force(160kg) was lower value than that of the top ball(188.37kg) and this showed significant difference statistically.
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체급경기선수의 급속 및 점증감량기간이 혈장량 및 체수분 조절호르몬에 미치는 영향
권영우(YoungWooKwon),박승한(SeungHanPark),류호상(HoSangRye),박영명(YoungMyungPark),김진형(JinHeungKim),권광선(KwangSunKwon),이종삼(JongSamLee),이종형(JongHyoungLee) 한국체육학회 2009 한국체육학회지 Vol.48 No.3
이 연구의 목적은 복싱선수의 급속체중감량과 점증체중감량이 혈장량과 체수분조절 호르몬(renin, aldosterone)에 미치는 영향을 규명하기 위한 것이다. 복싱선수 16명을 대상으로 급속감량집단(n=8명)과 점증감량집단(n=8명)으로 나누어 체중의 5%를 감량하였다. 급속체중감량은 3일간 이루어졌으며 1일째 2-3%, 2일째 3-4%, 3일째 5%의 체중을 감량하였다. 식이제한의 양은 하루 칼로리 섭취량의 50%로 하였다. 점증체중감량은 16일 동안 이루어졌으며 4일째 1-2%, 8일째 2-3%, 12일째 3-4%, 16일째 5%의 체중을 감량하였다. 식이제한은 하루섭취 칼로리의 40%로 하였다. 결과 체중감량은 혈장량을 감소시켰으며 급속감량집단의 감소율이 높은 것으로 나타났다(p=.007). 체중감량은 renin과 aldosterone을 증가시켰으며(p=.000), 급속감량집단의 renin 증가율이 높았다(p=.016). 이상의 결과를 종합하면 체중의 감량은 체수분은 감소시키고 체수분 조절호르몬은 증가시키며 급속감량이 점증감량보다 혈중 체수분의 감소가 높고 체수분 조절호르몬의 증가는 높은 것으로 나타났다. The purpose of this study was to investigate the effects of rapid and gradual weight loss on plasma volume and fluid regulatory hormone(renin, aldosterone). Sixteen male boxers participated in this study and were divided to rapid(n=8, RW) and gradual weight loss group(n=8, GW). All subjects reduced approximately 5% of their body weight. In the RW, weight loss was achieved in 3day by fluid and energy restriction and forced sweating, In the GW, weight loss was lost in 16day by energy restriction and exercise. Blood samples were extracted to analyze all variables from pre and post body weight loss. Blood plasma volume showed decrease with weight reduction in both groups and the rate of decrease was higher in rapid weight loss group than that of gradual weight loss group(p=.007). Blood renin concentration increased significantly after weight loss in both group and the rate of increase was higher in rapid weight loss group than that of gradual weight loss group(p=.016). In conclusion, weight loss resulted decreased plasma volume and increased fluid regulatory hormones suggesting negative trends during weight loss. Rapid weight exaggerated such negative changes. Further study needed to elucidate the exact mechanism related to exercise performance, VO2max, capillary density with rapid and gradual weight loss.
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