These problems create difficulties in mimicking sporting movements. Consequently, many testing protocols are limited to nonspecific tasks. It serves to perpetuate problems and increases the likelihood of inappropriate information being used to make coaching decisions. Proponents of this form of testing assert there is a high level of assessment control. Isometric assessments usually display high test-retest reliabilities.
Different tests are appropriate for athletes, nonathletes, women, men, and children.
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. This nonspecific measure and training mode is questionable for its relevance and transfer value to actual sporting movements.