The nurse is leading an exercise class for a group of adults aged 65 years and older. The nurse incorporates isotonic. Isometric, and isokinetic exercises into the class. Which activity is an isometric exercise?
A.
Carrying an air-filled ball while wading through the water across the width of a pool
B.
Contracting the gluteal muscles while holding a simple yoga pose
C.
Walking single file at a rate of 3 miles (5 km)/hour around a racetrack two times
D.
Sitting in a chair with a low weight on the side and lifting the knee to the seat level of the chair
The correct answer and Explanation is :
The correct answer is B. Contracting the gluteal muscles while holding a simple yoga pose.
Explanation
Isometric exercises are characterized by muscle contraction without a change in the length of the muscle or joint angle. In other words, during isometric exercises, the muscle remains contracted and static, which means there’s no movement at the joint. These exercises are great for improving strength and endurance of specific muscles without requiring large movements or equipment.
Here’s a breakdown of the options:
- A. Carrying an air-filled ball while wading through the water across the width of a pool: This activity involves movement and resistance provided by the water, making it an example of isotonic exercise, where muscles change length during contraction.
- B. Contracting the gluteal muscles while holding a simple yoga pose: This is an example of an isometric exercise. In this case, the gluteal muscles are contracted to maintain the position, but there’s no movement of the muscles or joints.
- C. Walking single file at a rate of 3 miles (5 km)/hour around a racetrack two times: Walking involves movement and muscle contractions that result in a change in muscle length, making it an example of isotonic exercise.
- D. Sitting in a chair with a low weight on the side and lifting the knee to the seat level of the chair: This activity involves movement of the knee joint and contraction of muscles as the leg is lifted, making it an example of isotonic exercise.
Isometric exercises can be particularly beneficial for older adults as they help maintain muscle strength and stability without the risk of joint strain or injury often associated with dynamic movements. They can be easily incorporated into various physical therapy and fitness routines, especially for those who may have mobility limitations or are recovering from injury.