University of Southern Maine; Exercise, Health and Sports Sciences, Gorham, ME, USA.
J Int Soc Sports Nutr. 2007 Dec 5;4:24. doi: 10.1186/1550-2783-4-24.
The purpose of this investigation was to identify the onset of the thermic effect of feeding (TEF) after ingestion of a high carbohydrate (CHO) and a high protein (PRO) 1255 kJ (300 kcal) drink.
Resting metabolic rate (RMR) and TEF were measured over 30-minute periods via indirect calorimetry using a ventilated hood technique. Eighteen subjects (7 men and 11 women) completed two randomized, double-blind trials. Data were collected in 1-minute measurement intervals. RMR was subtracted from TEF and the time of onset was obtained when two consecutive data points exceeded 5% and 10% of resting metabolic rate.
At 5% above RMR the onset of TEF for CHO was 8.4 +/- 6.2 minutes and was not different as compared to PRO, 8.6 +/- 5.2 minutes (p = 0.77). Likewise, no differences were found with a 10% increase above RMR: CHO, 14.1 +/- 7.5 min; PRO, 16.7 +/- 6.7 min (p = 0.36). Several subjects did not show a 10% increase within 30-min.
We conclude that the onset of TEF is variable among subjects but is initiated within about 5 to 20-min for most subjects after ingestion of a 1255 kJ liquid meal. No differences were found between CHO or PRO liquid meals.
本研究旨在确定摄入高碳水化合物（CHO）和高蛋白（PRO）1255kJ（300kcal）饮料后，进食产热效应（TEF）的起始时间。
通过通风罩技术，使用间接测热法在 30 分钟期间内测量静息代谢率（RMR）和 TEF，每 1 分钟测量一次。18 名受试者（7 名男性和 11 名女性）完成了两项随机、双盲试验。RMR 从 TEF 中减去，当连续两个数据点超过静息代谢率的 5%和 10%时，即可获得 TEF 的起始时间。
在超过 RMR 的 5%时，CHO 的 TEF 起始时间为 8.4±6.2 分钟，与 PRO（8.6±5.2 分钟）相比没有差异（p=0.77）。同样，在超过 RMR 的 10%时也没有发现差异：CHO，14.1±7.5 分钟；PRO，16.7±6.7 分钟（p=0.36）。一些受试者在 30 分钟内没有出现 10%的增加。
我们的结论是，TEF 的起始时间因人而异，但大多数受试者在摄入 1255kJ 液体餐后 5 至 20 分钟内开始出现 TEF。CHO 或 PRO 液体餐之间没有发现差异。
