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Journal of the International Society of Sports Nutrition

, 4:24

First Online: 05 December 2007Received: 12 October 2007Accepted: 05 December 2007


BackgroundThe 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.

MethodsResting 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.

ResultsAt 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.

ConclusionWe 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.

Electronic supplementary materialThe online version of this article doi:10.1186-1550-2783-4-24 contains supplementary material, which is available to authorized users.

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Autor: Christopher B Scott - Jill Fernandes - Maya Lehman

Fuente: https://link.springer.com/

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