A nurse should be concerned when observing a patient performing isometric exercises if the patient is:

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Patients doing isometric exercises should be taught to exhale while exerting effort.Many persons hold their breath (Valsalva maneuver),which increases intrathoracic pressure,causing a decrease in venous return to heart.
Each exercise prescription is individualized according to the patient's needs and limitations.Gradual buildup of exercise repetitions improves both muscle strength and endurance.
Hold muscles tightly contracted for 5 to 15 seconds,and then relax completely for several seconds.

A Nurse Should Be Concerned When Observing a Patient Performing