In our previous experiments on the specific dynamic action of foods in man, at first(1951, Japanese J. Nut., 9, 12) the basic study on the S. D. A. of high-protein diet, high-carbohydrate diet and high-fat diet in mixed form was undertaken. And in following experiment (1951, Ibid., 10, 71) the influence of the different caloric intakes upon the S. D. A. was also studied, proring that there was a proportional relation between the S. D. A. and the ingested calories.
The present experiments were carried out to investigate the influence of the energy production due to muscular work on the S. D. A, i. e., whether calories produced by the S. D. A. could he utilized in the energy requirement for the muscular work. Subject was one of authors aged 38 years. The test meals were as shown in table 1. The muscular work, as in table 2, was moderate walking for an hour at rate of 104-106 meters per minute after meal ingestion. The results were as follows.
As shown in table 2, the accumulation of extra calories (the total S. D. A.) which is deducted the value of basal metabolism and the energy value required to do walking from the total heat production, for the high-protein diet was 14.5% to ingested calories, for the high-carbohydrate diet 8.0% and for the high-fat diet 8.6%, These figures nearly correspond with these of the previous experiment in which no work was given (see table 3). The hourly process and the level of the curve of S. D. A. in every diet group also were similar to the previous experiments as in figure 1, 2, 3.
It may be concluded from the above results that when the moderate muscular work is accomplished for an hour after ingestion of mixed diet varying nutrients, the total extra calories is a summation of the increment due to the S. D. A. and that due to work, i. e., the S. D. A. can not be utilized into energy of muscular work. This results coincide with Anderson and Lusk's old data in the case of high protein ingestion, but do not with the results of the high fat or high carbohydrate meal.
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