24시간 식이제한 후 저항성 운동이 혈중 성장 호르몬, IGF-1, 코르티솔 및 테스토스테론에 미치는 영향
Effects of 24-hour Food Restriction on Plasma Human Growth Hormone, IGF-1, Cortisol and Testosterone Responses in Resistance Exercise
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PURPOSE: The purpose of this study was to investigate the effects of 24-hour food restriction on plasma human Growth hormone, IGF-1, cortisol and testosterone responses in resistance exercise. METHODS: The 13 college male students (Age; 24.7±1.2 years, Height; 174.1±2.0 cm, Body Weight; 70.4±1.5 kg) were randomly received to the control treatment (CON) and 24 hours fasting treatment (24-FT). The CON served the 400-kcal steam rice as the Korean traditional breakfast 3 hours prior to performing the resistance exercise, while the 24-FT did not eat any food except the water for 24 hours. The resistance exercise session consisted of squat exercise with 5 sets×6-8 repetitions with 80% of one repetition maximum. Blood samples were drawn before (pre), and immediately after exercise (0 minute) and at 15 minutes, 30 minutes, 60 minutes, 120 minutes after exercise. Plasma human growth hormone (hGH), total testosterone, cortisol, IGF-1, insulin, glucose and free fatty acid (FFA) concentrations were measured. RESULTS: Plasma hGH levels in 24-FT were significantly higher after exercise compared with the CON at 0, 15, 30, 60 minutes (p<.05). Cortisol levels in 24-FT were significantly higher than in the CON at before (pre) and 0 minute (p<.05). The plasma IGF-1 and testosterone levels were not significantly significantly different between two treatments. CONCLUSIONS: The results of this investigation suggested that the elevation of hGH might not be related to anabolic effects in food restriction. In addition, it seems that hGH response in resistance exercise is strongly affected by carbohydrate ingestion
Abstract
PURPOSE: The purpose of this study was to investigate the effects of 24-hour food restriction on plasma human Growth hormone, IGF-1, cortisol and testosterone responses in resistance exercise. METHODS: The 13 college male students (Age; 24.7±1.2 years, Height; 174.1±2.0 cm, Body Weight; 70.4±1.5 kg) were randomly received to the control treatment (CON) and 24 hours fasting treatment (24-FT). The CON served the 400-kcal steam rice as the Korean traditional breakfast 3 hours prior to performing the resistance exercise, while the 24-FT did not eat any food except the water for 24 hours. The resistance exercise session consisted of squat exercise with 5 sets×6-8 repetitions with 80% of one repetition maximum. Blood samples were drawn before (pre), and immediately after exercise (0 minute) and at 15 minutes, 30 minutes, 60 minutes, 120 minutes after exercise. Plasma human growth hormone (hGH), total testosterone, cortisol, IGF-1, insulin, glucose and free fatty acid (FFA) concentrations were measured. RESULTS: Plasma hGH levels in 24-FT were significantly higher after exercise compared with the CON at 0, 15, 30, 60 minutes (p<.05). Cortisol levels in 24-FT were significantly higher than in the CON at before (pre) and 0 minute (p<.05). The plasma IGF-1 and testosterone levels were not significantly significantly different between two treatments. CONCLUSIONS: The results of this investigation suggested that the elevation of hGH might not be related to anabolic effects in food restriction. In addition, it seems that hGH response in resistance exercise is strongly affected by carbohydrate ingestion
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