The use of an isometric squat test as a measure of lower body maximal strength

A number of different tests can be utilised for the measurement of lower body maximal strength. The isometric squat (ISq) is a highly controlled and externally valid test of lower body maximal strength. This research aimed to add to the knowledge base of the overall usefulness of the ISq as a measure of lower body maximal strength. The first experimental study established the reliability of the test at a 120°, 90° and 65° knee angle position; the latter placed subjects in a previously unexplored deep squat position. All positions demonstrated acceptable reliability (≤ 10 % CV, ≥ 0.8 ICC) for maximal (peak isometric force) but not explosive (rate of force development) strength. The characteristics of the ISq suggest it is appropriate to use regardless of an individual’s maximal strength level. This hypothesis was tested by comparing the reliability of the ISq across a heterogeneous sample, covering the entire strength spectrum from untrained individuals to highly trained strength athletes. Similar reliability was evident across the entire sample, with no relationship between ISq strength and reliability. In order to determine the sensitivity of the ISq to measure changes in strength as an outcome, maximal strength changes in response to 6 weeks of ecologically valid strength training were assessed in a group of moderately trained males. The ISq was sensitive to detect changes in maximal strength. Use of a dual force plate ISq apparatus allows for separate individual analysis of the lower limbs; facilitating the monitoring of inter-limb asymmetries. The use of the ISq to detect bilateral vs. unilateral training induced changes in inter-limb asymmetry was assessed in moderately trained males. Both forms of training were effective at reducing inter-limb asymmetries. This thesis documents the overall utility and versatility of the ISq in the context of lower body maximal strength measurement.