When skeletal muscles are trained by adding physical stress to them, this is called progressive resistance training muscle endurance isometric exercise training isotonic exercise training

When skeletal muscles are trained by adding physical stress to them, this is called progressive resistance training (PRT).

Explanation:

During PRT, muscles are exercised against an overload or resistance; the overload is gradually increased in order to allow muscles to adapt. This allows for progressive strength increases over time.

Muscle fatigue is defined as a reduction in the ability to produce force due to exercise. This comprises:

peripheral fatigue- due to changes at the junction between motor neurons and the muscle.central fatigue- caused by a reduced capacity to use voluntary force in relation to the capacity to use involuntary forceand muscle damage- this is associated with several issues at the cellular level such as disrupted membranes and cytoskeletons; and tissue damage via torn muscle fibers, and collagen.

Overall, these may affect muscle fiber activation and the amount of force they are capable of producing- i.e. sustained strength. However, muscle fatigue  can be greatly reduced via the maintenance of PRT. Also, apart from strength gains, PRT is used for weight loss and muscle building; common tools used in PRT include free weights, elastic bands and exercise machines.

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