Brigham, Robert J.
M.S. (Master of Science)
Department of Physical Education
This study was undertaken to determine whether a program of isometric or isotonic exercises would be significantly superior to the other in increasing the endurance of the broad jumper. Forty-six students were selected at random from the required physical education program of Lake Forest College. They were tested in the standing broad jump, with seven jumps each. The total of the subjects jumps was used to divide the subjects into two matched groups by assigning the best jumper to one group, the second and third best Jumpers to the second group, and the fourth and fifth jumper into the first group, and so on, until all jumpers were assigned to groups. Each group was assigned an exercise at random. The isometric group was instructed on its exercise, which was similar to lifting oneself in a basket. An isometric kit was used. The kit consisted of a bar, which the subject stood on, a bar for the subject to lift with, and a canvass strap connecting the two bars. While standing on one bar, the subject lifted with the other bar for a ten second interval at an all-out effort. This was done with the handbar in front of the subject and with the bar in back of the subject. The individuals in the isotonic group were weighed as one fourth of their weight was the amount of weight used for the exercise. The isotonic group did toe raises, fifty the first week, seventy-five the second week, and one hundred thereafter. The subjects supported a barbell on their shoulders with the proportional amount of collar weights on the barbell. The training program took place three times per week for eight weeks. After the training program ended, the subjects were again tested in the standing broad jump with seven jumps. The results were analyzed statistically to compare the significance of the programs. The hypothesis under test was that no difference would occur between the programs, and that any difference observed might be attributed to chance arising from the random assignments of subjects to groups and groups to treatments. The comparison of the isometric group to the isotonic group revealed no significant difference between the groups and the hypothesis was accepted. The isotonic group showed a significant difference within the group and so the hypothesis was rejected, while the isometric group revealed no significant difference within the group and the hypothesis was accepted. A purpose of the study was to analyze each jump (number one, number two, etc.) and determine whether any significant differences occurred in these jumps. None of the jumps indicated a significant difference between the programs and the hypothesis was accepted. In the isotonic group, the second, third and fourth jumps were significantly different within the group and the hypothesis was rejected. The first, fifth, sixth and seventh jumps did not indicate a significant difference and the hypothesis was accepted. In the isometric group there was no significant difference within the group for any of the jumps and the hypothesis was accepted in all cases.
Hayes, Dean Anthony, "The effect of isometric and isotonic exercises on the endurance of the standing broad jumper" (1965). Graduate Research Theses & Dissertations. 5523.
viii, 52 pages
Northern Illinois University
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