Dominic Stone
Muscle power is defined as the amount of work performed per unit of time. It is distinct from muscle strength, which is the maximal force that can be applied against a load. Muscle power can be assessed by measuring the ability to exert a maximal force in as short a time as possible, as in accelerating, jumping and throwing. There are several methods for assessing muscle power, including the use of a dedicated proprietary device or a piece of chalk to mark the highest point a person can reach.
| Characteristics | Values |
|---|---|
| Definition | The ability to exert a maximal force in as short a time as possible, as in accelerating, jumping and throwing implements |
| Function of muscle strength testing | To evaluate the complaint of weakness, often when there is a suspected neurologic disease or muscle imbalance/weakness |
| Muscle strength testing | Used to determine the capability of a muscle or muscle group to produce force |
| Muscle strength assessment | Can be done manually, functionally, or mechanically |
| Muscle power assessment | Can be done using a dedicated proprietary device |
| Muscle power assessment | Can be done by having the client hold a piece of chalk in the hand closest to the wall on the side of measurement, and instructing them to reach as high as possible and make a mark on the wall for the zero starting position |
| Muscle power assessment | Can be done by instructing the client not to move their feet and to flex at the knee, hip and ankle, then to jump, pushing back the highest reachable marker on the dedicated proprietary device |
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What You'll Learn
Using a dedicated proprietary device
Assessing muscle power using a dedicated proprietary device
To assess a client's muscle power using a dedicated proprietary device, the client should be positioned with equal weight on bilateral lower extremities, approximately shoulder-width apart. The client should then be instructed to push back the highest reachable marker on the device to mark the zero starting position. The client's score is the vertical distance between the zero starting position and the highest reachable marker. This should be recorded to the nearest 0.5 inches (1.25 cm), with the best of three trials recorded.
For the jump, the client can choose from various opposite hand positions (hand on hip or behind back, or free to use during the jump). However, it is important to ensure that the hand position remains constant during pre- and post-testing. The client should be instructed not to move their feet and to flex at the knee, hip and ankle, before jumping and pushing back the highest reachable marker.
Dedicated instruments, such as the Myometer Muscle strength tester, can be used to perform more consistent fixed-point isometric muscle strength tests. These devices provide automatic calculation and display of Constant Score values, offering a quick and reliable patient assessment.
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Manually testing muscle strength
Muscle strength can be assessed manually, functionally or mechanically. Manual muscle strength testing is used to evaluate the complaint of weakness, often when there is a suspected neurologic disease or muscle imbalance/weakness. It is an important part of the assessment in many client groups, including patients with stroke, brain injury, spinal cord injury, neuropathy, amyotrophic lateral sclerosis, older people groups and a host of other neurologic problems.
Muscle strength testing determines the capability of the muscle or muscle group to produce force. It provides information that is useful in the differential diagnosis, prognosis and management of neuromuscular and musculoskeletal disorders.
There are three key approaches to muscle strength testing: isokinetic, isotonic and isometric testing. During a muscle strength assessment, it is important to respect pain and consider patient comfort. For example, in cases where fatigue may be harmful or exacerbate the person's condition, such as lower motor neuron disease, chronic obstructive pulmonary disease or multiple sclerosis.
One way to assess muscle power is to position the client so that they are standing with equal weight on bilateral lower extremities, approximately shoulder-width apart. The client should then push back the highest reachable marker on a dedicated proprietary device to mark the zero starting position. If you are not using a dedicated proprietary device, have the client hold a piece of chalk in the hand closest to the wall on the side of measurement, and instruct them to reach as high as possible and make a mark on the wall for the zero starting position.
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Isokinetic testing
Muscle power is defined as the amount of work performed per unit of time. Muscle strength can be assessed manually, functionally or mechanically. Muscle strength testing is used to determine the capability of the muscle or muscle group to produce force. There are three key approaches to muscle strength testing: isokinetic, isotonic and isometric testing.
Isokinetics has been used in testing and rehabilitation for the last 60 years. Its most common use has been for selected musculoskeletal injuries at the knee because of the frequency of injury and ease of testing.
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Isotonic testing
Muscle power is defined as the amount of work performed per unit of time. While strength is the maximal force that can be applied against a load, power is proportional to the speed at which this force can be applied.
Muscle strength can be assessed by a number of methods: manually, functionally, or mechanically. Muscle strength testing is used to determine the capability of a muscle or muscle group to produce force. It is often used to evaluate complaints of weakness, particularly when there is a suspected neurologic disease or muscle imbalance/weakness.
There are three key approaches to muscle strength testing: isokinetic, isotonic, and isometric testing. Isotonic testing involves the muscle contracting and shortening to produce movement against a load. The speed of movement is determined by the amount of force applied. For example, if you are lifting a weight, the heavier the weight, the slower the movement.
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Isometric testing
Muscle power is defined as the amount of work performed per unit of time. Muscle strength can be assessed manually, functionally or mechanically. There are three key approaches to assessing muscle strength: isokinetic, isotonic and isometric testing.
Isometric strength testing can be used to test strength and asymmetries through intricate joint functions, which can assist in piecing together pain/injury presentations in the physiotherapy rooms. It can also be used to test baseline strength and progression over a training journey. The test can be performed in a matter of seconds, as opposed to having to warm up and do multiple sets to find the maximum strength during an exercise.
Resisted isometric movement testing is a convenient and clinically useful technique to detect neuromuscular dysfunction and disease, and to track the progress of patients as they undergo rehabilitation. There are generally two types of test procedures for isometric testing: a “make” test involves the patient exerting a maximum voluntary effort against fixed resistance provided by the examiner. Manual isometric muscle testing is a common clinical technique that is used to assess muscle strength. To provide the most accurate data for the test, the muscle being assessed should be at a length in which it produces maximum force.
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Frequently asked questions
Muscle power is the amount of work performed per unit of time.
Muscle power can be assessed by testing muscle strength. This can be done manually, functionally or mechanically.
Muscle strength testing is used to determine the capability of the muscle or muscle group to produce force. It is also used to evaluate the complaint of weakness, often when there is a suspected neurologic disease or muscle imbalance/weakness.
