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Rats or mice are placed on a wire grid with either forelimbs alone or forelimb + hindlimb gripping the grid, pulled backwards by the tail, and the maximal force the animal exerts at the time of release is recorded.
This test is a simple and reliable measure of the function of the general motor capability of the animal, in particular, the function of the spinal motor neurons, efferent axonal conduction, neuromuscular junction, and the muscles themselves. It is customarily included as an endpoint is Spinal Muscular Atrophy model (SMA Model) studies as well as Amyotrophic Lateral Sclerosis model (ALS Model) studies.
Grip Strength is an assay that can typically be performed in one day for an entire experimental cohort of animals. Because it is non-invasive it can easily be repeated several times over the course of a chronic study.