Assessment of muscle power

Assessment of muscle powerPresented by: Jwanika

Vansiya

Strength vs. Power Strength

Strength is the amount of force a muscle or group of muscle can exerts against an external load- a barbell in case of weight lifting.

In strength speed of the movement is not imp.

Ex. – squats, shoulder presses, pull ups, bench press

Strength vs. Power

Power Power is a force developed

quickly and combines strength and speed.

Power = strength *speed EX.- depth jump, hardle

jump Power training requires

fast motion to be effective.

Power assessment is done in two ways:

Power assessment

Manual Instrumental

Manual muscle testing is a procedure for the

evaluation of the function and strength of individual muscle and muscle groups based on effective performance of movement in relation to the force of gravity and manual resistance.

1. Manual muscle testing

To determine the extent and degree of muscular

weakness resulting from disease, injury or disuse.

The records obtained from these tests provide a base for planning therapeutic procedures and periodic re-testing.

Muscle testing is an imp tool for all members of the rehabilitation team.

Uses

Contraindications and precautions

contraindications

Pain

Inflammation

Cardiac or respiratory

disease

Pts. With history at risk of having

cardiovascular problems. Abdominal surgery or herniation of abdominal

wall to avoid stress on the abdominal wall. Fatigue exacerbate the pt’s condition.

patient with extreme debility, for ex. Malnutrition, malignancy and severe COPD.

Extra care must be taken where resisted movements might aggravate the

condition

Procedure Explanation

and instruction

Patient position

Assessment of the normal side muscle

strengthStabilization

Subtitute movement

1. Evidence of muscle contraction: Grade 0: no palpable or observable muscle contractionGrade1: palpable or observable muscle contraction and no joint motion.2. Gravity as a resistance: Grade2: gravity eliminated movementGrade3: against gravity3. Amount of manual resistance: Grade4: full ROM against gravity and against moderate manual resistance Grade5: maximal resistance

Conventional methods:

Conventional grading

validity

Reliability

.

Instrument choosen to assess muscle strength

depends on the degree of accuracy required in the measurement.

Instrumentation

Hand held dynamomet

erFree weight Cable

tensiometer Pinch gauge

Hand held dynamometer

Device operate on principle of compression.

Application of external force to the dynamometer compress a steel spring and moves a pointer.

. Dynamometer

measures strength of elbow

flexors

Dynamometer measures strength of dorsiflexors

Dynamometer measures

strength of wrist flexors

.

Lateral pinch strength

measurement using pinch

dynamometer

Cable tensiometer

Force during knee extension increased force on cable depresses a riser over which cable passes , this deflects the pointer and indicates amount of force applied

To test 1RM for single or multiple muscle groups

choose the initial weight close to the below maximum lifting capacity.

Weight is progressively added on subsequent attempts until the person reaches max. lift capacity. The weight increments between 1to5 kg depending on the muscle group evaluated.

Dividing the 1RM score by body weight assesses the relative muscular strength.

1RM / Body weight

Assess 1RM of muscles for bench press and leg press

.

Daniels and Worthingham’s MUSCLE TESTING – 6th

Edition ( Helen J. Hislop and Jacqueline Montgomery)

MUSCLES TESTING AND FUNCTION- 4th edition ( Florence Peterson Kendall, Elizabeth Kendal McCreary, Patricia Geise Provance )

MUSCULOSKLETAL ASSESSMENT -3rd Edition ( Hazel M. Clarkson )

ESSENTIALS OF EXERCISE PHYSIOLOGY – 4TH Edition ( Victor C. Katch, William D. McArdle, Frank I. Katch)

References

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