Abstract:
The purposes of this research were to study and to compare physical working capacity at 1, 2, 3, and 4 hours intervals after having general diet, soft diet and liquid diet. The subjects were twelve healthy volunteered males from Nayai-armpittayakom School, Chantaburi whose average ages were 15.34 years, weights were 55.58 kilograms and heights were 167.08 centimeters, respectively and which were devided 3 groups with 4 persons. Prior to the experiment, subjects pedalled on the Monark bicycle ergometer for testing the physical working capacity 170. The first load was at 70 % of maximum work from the first PWC 170 test of each subject, the increased 25 watts for every 2 minutes. This testing was done after the breakfast meal in the room that temperature was kept constantly at 25 ± 2 ℃ with 70 ± 5 % humidity. The data were analyzed in terms of means, standard deviation, two-ways analysis of variance and Scheffe test. It was found that: 1. There were no significant differences among the physical working capacity at 1, 2, 3, and 4 hours after having same kinds of food at the .05 level. 2. The comparison of means average of the physical working capacity after having different kinds of food showed that the means average of the physical working capacity after having liquid diet was higher than the means average of the physical working capacity after having general diet and the means average of the physical working capacity after having soft diet at the significant difference of .05 level but there was no significant difference between the physical working capacity after having general diet and after having soft diet at the .05 level. 3. There were no interactions between time intervals and kinds of food for the physical working capacity.