Relationship between the Relative and Absolute Isometric Endurance of an Isolated Muscle Group

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Abstract
The study was concerned with devising a model to fit the relationships that were found to exist between isometric measures of strength and endurance, within a sample of 30 men. Two measures of endurance were taken using different loading factors. The first measure used a common load of 5/8 of the mean of the maximum strengths recorded for the members of the sample and the scores thus obtained were termed the "absolute" endurance. The second measure used an individual load of 5/8 of the maximum strength recorded for each particular member of the group and the scores thus obtained were called the "relative" endurance. On the basis of the interrelationships of the measures, it was suggested that when intramuscular tension becomes sufficient to cause intramuscular vascular occlusion, isometric endurance is related to strength. When the tension produces only partial occlusion the local circulatory efficiency has to be considered and the relationship of endurance to strength becomes less until with very light loading the factors causing cessation of work might bear little relation to strength.

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