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RISS 인기검색어
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- 저자 : ( Stephen H Boutcher ) (검색결과 2 건)
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( Aaron Chu ),( Yati N Boutcher ),( Stephen H Boutcher ) 한국운동영양학회 2016 Physical Activity and Nutrition (Phys Act Nutr) Vol.20 No.1
[Purpose] Postprandial lipemia (PPL) contributes to the development of atherosclerosis. In females, repeated 8-second bouts of interval sprinting exercise reduced PPL, however, the effect of 8-second bouts of interval sprinting on PPL of overweight males is undetermined. Thus, the effect of 8-seconds of interval sprinting for 20 min, the night before ingestion of a high-fat meal (HFM), on plasma triacylglycerol (TG) levels was examined. [Methods] Ten overweight males acted as participants (BMI = 26±3.0 kg/㎡, age 22±2.5 years). A crossover design was employed with interval sprinting and a no exercise condition separated by 7days. Participants consumed a milkshake (high-fat meal; HFM = 4170 kJ/993 Kcal) the morning after an overnight fast, followed by 4 hourly blood samples. Participants performed one bout of interval sprinting (8 seconds sprinting at 110-115 rpm, 12 seconds active recovery at ~ 60 rpm for 20 minutes) the evening before the consumption of the HFM. [Results] Postprandial TG was 22.5% lower in the interval sprinting compared to the no exercise condition when comparing the change in total area under the curve (ΔAUCT): ISE(7.15±1.90 mmolL(-1)h(-1)) versus no exercise (9.22±3.44 mmolL(-1)h(-1)), p=.014. The correlation between fasting TG levels in the no exercise condition and total reduction in AUCT between the conditions was significant (r=.87, p=.001). [Conclusion] One 20-min bout of interval sprinting,the night before consumption of a HFM, significantly attenuated the PPL response of sedentary males.
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( Daniel E Gahreman ),( Yati N Boutcher ),( Sonia Bustamante ),( Stephen H Boutcher ) 한국운동영양학회 2016 Physical Activity and Nutrition (Phys Act Nutr) Vol.20 No.1
[Purpose] This study investigated the combined effect of green tea and acute interval sprinting exercise on fat oxidation of trained and untrained males. [Methods] Fourteen trained and 14 untrained males ingested one capsule containing either green tea or cellulose with breakfast, lunch, and dinner, 24 hours before two exercise sessions. A fourth capsule was consumed 90 minutes before exercise after overnight NPO (nil per os). Participants performed a 20-minute interval sprinting cycling protocol, consisting of repeated bouts of 8-seconds of sprint cycling (at 65% of maximum power output) and 12-seconds of recovery (at 25% of maximum power output), followed by 75 minutes of post-exercise recovery. [Results] Fat oxidation was significantly greater in the resting condition after green tea ingestion (p < 0.05) compared with the placebo. Fat oxidation was also significantly increased post-exercise in the green tea, compared with the placebo condition (p < 0.01). During and after exercise the plasma glycerol levels significantly increased in both groups after green tea consumption and were significantly higher in the untrained group compared with the trained group (p < 0.05). Compared with the placebo, the plasma epinephrine levels were significantly higher for both groups in the green tea condition during and after exercise, however, norepinephrine levels were only significantly greater, p < 0.05, during and after exercise in the untrained group. [Conclusion] Green tea significantly increased resting and post-exercise fat oxidation and also elevated plasma glycerol and epinephrine levels during and after interval sprinting. Glycerol and norepinephrine levels during interval sprinting were significantly higher in the untrained group compared with the trained group.
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