For example, several acute variables, including preloading and recovery between 1RM efforts, may affect 1RM strength. The number of trials to achieve maximum and the type of movement will also affect reliability. Further, it is also very possible that maximum values of exertion may not be the best measure of a strength and power capacity in a number of sports. Isokinetic dynamometry is perceived to be the easiest assessment over which to achieve reliability and objectivity. However, the movement loading pattern bears little relationship to most sporting activities.
Reliability is affected by the selected speed of the movement.
Usually fewer trials are needed for slow movements while more are needed for fast movements. The order of testing also influences results. It has been shown that reliability of eccentric and concentric assessments is reduced when tests for highest speed precede those of lower speeds. Further, results for one joint should not be considered characteristic of other untested joints. It is incorrect to infer strength status between joints and movements, particularly in highly trained athletes.