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고강도와 중등강도 유산소성 운동이 중년 여성의 혈중 BDNF 농도, 노화 관련 호르몬 및 생활습관병 관련 혈액 변인에 미치는 영향

The effects of regular vigorous- and moderate-intensity aerobic exercise on serum BDNF level, aging- and lifestyle disease-related blood components in middle-aged women

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[목적] 본 연구는 8주간 고강도와 중등강도 유산소성 운동이 중년 여성의 혈중 BDNF 농도 및 노화 관련 호르몬, 생활습관병 관련 혈액 변인, 그리고 신체구성, 유산소성수행능력에 미치는 영향을 규명하고자 하였다. [방법] 연구대상자는 신체적으로 건강한 50대 여성 총 19명을 대상으로 하였으며, 연구대상자들은 고강도 유산소성 운동 그룹(VIAE, n=10)과 중등강도 유산소성 운동 그룹(MIAE, n=9)으로 무작위 분류하였다. 유산소성 운동은 8주간 주 3회 트레드밀 달리기 형태로 실시하였으며, 운동부하검사를 통해 VO2max를 기준으로 고강도 운동 그룹(VIAE)은 VO2max의 75~80% 강도, 중등강도 운동 그룹(MIAE)은 VO2max의 55~60% 강도에 해당하는 운동 강도 및 운동 시간을 적용하였다. 유산소성 강도에 따른 효과를 규명하기 위하여 사전·사후 연구대상자들의 혈액 샘플을 채취하고 혈중 BDNF 농도 및 노화 관련 호르몬 그리고 생활습관병 관련 혈액을 분석하였으며, 신체구성 및 유산소성 수행능력을 측정하였다. [결과] 첫째, 최대산소섭취량(VO2max)은 VIAE 그룹이 MIAE 그룹보다 사후에 더욱 유의하게 증가하였다(p<.05)(Table 4). 둘째, 신체구성의 경우 체중(kg), BMI, 체지방률(%)이 두 그룹 모두 사전보다 사후에 유의하게 감소하였다(p<.05)(Table 5). 셋째, 혈중 BDNF 농도는 VIAE 그룹이 MIAE 그룹보다 사후에 더욱 유의하게 증가하였다(p<.05). 그리고 혈중 DHEA-s와 IGF-1 농도는 두 그룹 모두 사전보다 사후에 유의하게 증가하였다(p<.05)(Table 6). 넷째, 혈중 FFA, TG 농도는 두 그룹 모두 사전보다 사후에 유의하게 감소하였고(p<.05), HDL-C 농도는 두 그룹 모두 사전보다 사후에 유의하게 증가하였다(p<.05)(Table 7). [결론] 8주간 고강도 유산소성 운동은 중등강도와 비교하여 중년 여성의 최대산소섭취량(VO2max), 혈중 BDNF 농도를 더욱 증가할 뿐만 아니라 노화 관련 호르몬 및 생활습관병 관련 혈액 인자의 긍정적인 변화를 유도할 수 있음을 시사한다.

Abstract

[Purpose] The purpose of this study was to investigate the effects of regular vigorous- and moderate-intensity aerobic exercise on serum brain-derived neurotrophic factor (BDNF) level, aging- and lifestyle disease-related blood components in middle-aged women. [Methods] The participants were recruited from a total of 19 physically healthy people aged 50-59 years, and were randomly divided into vigorous-intensity aerobic exercise (VIAE, n = 10) and moderate-intensity aerobic exercise (MIAE, n = 9) group. The participants were performed vigorous- and moderate-intensity aerobic exercise three times a week for eight weeks, and body composition measurement, graded exercise test, blood collection were performed before and after. [Results] Mean exercise time was significantly longer in the MIAE group than in the VIAE group. The VO2max was significantly higher in the VIAE group than in the MIAE group. Body weight, BMI, and body fat percentage were significantly lower than pre both groups. The BDNF concentration was significantly higher in the VIAE group than in the MIAE group. The dehydroepiandrosterone sulfate (DHEA-s) and insulin-like growth factor-1 (IGF-1) concentration were significantly higher than pre both groups. The free fatty acid and triglyceride concentrations were significantly lower than pre both groups, and HDL-C concentrations were significantly higher than pre both groups. [Conclusion] Vigorous-intensity aerobic exercise not only increases maximal oxygen uptake and blood BDNF level in middle-aged women, but also induces positive changes in aging-related hormones and lifestyle-related blood variables.

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