It serves to perpetuate problems and increases the likelihood of inappropriate information being used to make coaching decisions. The current trend to perform testing for testing sake is the symptom of this expediency. Proponents of this form of testing assert there is a high level of assessment control. Detractors assert that isometric tests bear little semblance to the dynamic nature of sporting tasks. Isometric assessments usually display high test-retest reliabilities.
Different tests are appropriate for athletes, nonathletes, women, men, and children.
Differences in the posture of actions also change reliabilities. Isoinertial dynamometry involves natural activities. Isoinertial means constantly resistant to motion, and in most activities resistances such as gravity, water, air, and equipment are always impeding progress and performance. However, isoinertial movements also bear little resemblance to sporting activities. They are usually performed relatively slowly and are trained by a low number of repetitions.