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아동용 운동놀이기구를 이용한 일회성 운동 시 산소소비량 및 성장관련 호르몬의 반응

Responses of Oxygen Consumption and Hormones Related Growth to Acute Exercise Using Sporting Equipment

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초록

이 연구는 10명의 아동(4∼5세)를 대상으로 아동용 운동놀이기구(토이아띠)를 이용하여 20분동안 운동 때 소모되는 순수한 산소소비량(VO2ml/kg/min)을 산출함으로써 운동 때 소모되는 칼로리소비량(kcal/kg/min)과 운동 전·후 GH(growth hormone), IGF-1(insulin-like growth factor-1), cortisol, thyroxine(T4), insulin 및 IGFBP-3(Insulin-like growth factor binding protein-3)와 같은 성장관련 호르몬의 변화량에 대한 기초자료를 제공하는데 목적이 있었으며, 그 결과는 다음과 같다. 1. 20분간 놀이기구를 타고 운동할 때의 평균 분당심박수는 174.12±16.52 bpm에 해당하며, 운동강도는 VO2max의 67.33±10.92% 또는 HRmax의 80.87±7.75%에 해당하였다. 이때의 분당칼로리 소비량은 0.1774kcal/kg/min이었다. 2. 아동용 놀이기구를 이용하여 약 67.33±10.92% VO2max의 운동강도로 20분 동안 운동한 후 GH는 378.37%(6.01±2.97 vs 22.74±4.59 ng/ml, p=.008) 그리고 IGF-1은 108.46%(152.44±9.55 vs 165.33±11.76 ng/ml, p=.036) 각각 유의하게 증가한 반면 insulin은 54.52%(14.27±2.34 vs 7.78±2.06 ㎍/dl, p=.016) 감소하였다. 그러나 cortisol, T4, IGFBP-3 및 IGF-1/IGFBP-3의 비율은 유의한 변화를 나타내지 않았다. 3. 운동전·후 일부 관찰변인간의 상관관계에서는, 나이가 증가할수록 몸무게(p= .032)와 체지방률(p= .005)이 유의하게 증가하는데 반하여 키의 성장은 나이와는 유의한 상관관계(p=.077)를 보이지 않았으나 골연령과는 유의한 정상관(p= .043)을 나타내었다. 또한, 호르몬의 경우 안정시 insulin은 안정시 및 운동 후 IGF-1의 농도와 각각 매우 높은 정상관(p=.021, p=.001)을 보였다. 또한, GH는 운동중 VO2가 높을수록 농도가 높아지는 정상관(r= .674, p= .047)을 보인 반면 IGF-1은 운동 중 평균심박수(HR)와는 역상관(r= -.734, p= .024)을 보였다. 이상의 결과를 종합하여 볼 때, 아동용 놀이기구를 이용하여 53∼84% VO2max의 강도로 20분 동안의 운동 시 GH와 IGF-1의 증가 및 isulin의 감소를 유발할 수 있다. 그리고 GH의 농도는 운동강도와 비례하여 증가하는 반면 IGF-1의 운동반응은 혈청 insulin의 농도에 직접적으로 의존하는 것을 알수 있었다.

Abstract

The purpose of this study was to examine the response of oxygen consumption (VO2 ml/kg/min) and hormones related growth to acute exercise using Toyatti in child(six boys and four girls). Ten 4 to 5 years (60.60±6.70 months) old child exercised 20 min using Toyatti at the level of 53∼84% VO2max. We measured VO2 (ml/kg/min) during the exercise to calculate energy expenditure (kcal/kg/min) during exercise. Venous blood samples were obtained before, 5min after exercise for the measurement of serum GH (growth hormone), IGF-1 (insulin-like growth factor-1), cortisol (COR), thyroxine (T4), insulin (INS), and IGFBP-3 (Insulin-like growth factor binding protein-3). As results, average heart rates (HRs), %VO2max, %HRmax, and energy expenditure during 20min exercise using Toyatti were 174.12±16.52 bpm, 67.33±10.92%, 80.87%, and 0.1774 kcal/kg/min respectively. Seconds, Acute exercise did not affect significantly serum IGFBP-3, IGF-1/IGFBP-3 ratio, COR and T4 but GH (↑378.37%, 6.01±2.97 vs 22.74±4.59 ng/ml, p=.008) and IGF-1 (↑108.46%, 152.44±9.55 vs 165.33±11.76 ng/ml, p=.036) were significantly increased after exercise. Third, the age was positively correlated with body weight(r= 0.674, p= .032), % body fat (r= 0.808, p= .005), whereas the growth in height was not significantly correlated with the age (r= 0.582, p= .077) but the bone age (r= 0.648, p= .043). In addition, the basal and post-exercise IGF-1 levels were positively correlated with the basal insulin concentrations (r= .746, p= .021; r= .906, p= .001, respectively). In additioin, average VO2 ml/kg/min during exercise was positively correlated with GH concentration (r= 0.674, p= .047), whereas IGF-1 concentration was negatively correlated with average HR (r= -0.734, p= .024), respectively. In conclusion, 20min exercise at the level of 53 to 84% VO2max using Toyatti might significantly increase in the concentration of GH and IGF-1, and significantly decrease in insulin concentration.

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