혈중 지질과 염증반응을 고려한 최적의 일회성 운동강도 모색
Seeking Optimal Acute Exercise Intensities Based on the Blood Lipid and Inflammation
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이 연구는 다양한 일회성 운동강도 처치의 비교를 통해 혈중지질 반응에 긍정적이면서도 염증반응이 증가되지 않는 최적의 일회성 운동강도를 규명하는 것이었다. 이 연구를 위해 10명의 연구 참여자를 대상으로 자전거를 이용한 최대점증부하검사를 실시하여 각 개인의 무산소역치(Individual Anaerobic threshold; IAT)를 결정하였다. IAT강도에서의 심박수를 100% 강도로 결정하고 Kavornen 공식을 활용하여 70, 80, 90, 100, 110% IAT 강도에서의 심박수와 각 강도별로 300kcal를 소비하는데 소요되는 시간이 결정되었다. 실험참여자들은 무선할당방식으로 각 강도에서 300kcal를 소비하는 운동처치를 주당 1회씩 실시하였으며 매 운동처치마다 운동 전, 운동 중(150kcal소비시점), 운동 직후, 휴식 30분, 휴식 90분에 상완정맥에서 혈액을 채혈하였다. 또한 아무런 자극이 없는 수준과의 비교를 위해 좌식안정을 취하며 동일한 시기에 혈액만 채혈하는 control 집단도 함께 구성하였다. 수집된 혈액에서 혈중지질(HDL-C, LDL-C, TG, TC)과 염증지표(hs-CRP, WBC와 하위변인)를 관찰하여 얻은 결과는 80%와 90% IAT에서의 운동이 운동 후 90분까지 TG를 운동 전에 비해 약 10%정도 낮추는 것으로 나타났고, 염증반응은 110%IAT까지 크게 증가되지 않는 것으로 나타나 혈중지질에 긍정적이면서도 염증반응을 증가시키지 않는 운동강도는 80~90% IAT인 것으로 판단된다.
Abstract
The purpose of this study was to investigate the optimal acute exercise intensity which has positive effect on the blood lipid concentrations and didn't increase inflammation, through the comparison of various acute exercise intensity treatments. For this, 10 participants underwent bicycle graded exercise test and by this, their individual anaerobic threshold (IAT) was decided. The heart rate (HR) at the IAT was settled at 100% intensity, and the HR of 70, 80, 90, 100, 110% intensity was calculated by the using the Kavornen formula, and the consumption time for 300kcal at each intensity was decided. All kind of intensities were applied by counter balance method to subjects at one week intervals, and they consumed 300kcal during every exercise trial. One time of control treatment was added to the treatment which consist of blood sampling while resting at chair. the blood sample was collected at pre-exercise, during exercise (at the time of consuming 150kcal), post exercise (PE), 30min after from PE, and 90min after from PE. From the blood, blood lipid (HDL-C, LDL-C, TG, TC) and inflammation parameter (hs-CRP, WBC, WBC subfraction) was analyzed. The result was that 80%, 90% IAT lower TG about 10% until 90min after from PE when compare with pre-exercise while the inflammation response didn't increased until 110%IAT. It can be concluded that the optimal intensity which has positive effect for blood lipid and didn't increased inflammation response appeared at 80% and 90% IAT.
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