Strength Isometric Test: Knee Hamstring 90/90
Jul 07, 2023The Hamstring 90/90 test is a physical assessment that measures the flexibility of the hamstrings, which are the muscles at the back of the thigh.
To test Hamstring 90/90 isometric strength with a muscle meter, follow these steps:
- Have the client resting in a supine position on the floor next to a massage table, with their hips and knees both at 90 degrees of flexion.
- Place the Muscle Meter underneath the client’s testing foot across the surface of the achilles tendon. If the client is not wearing shoes, it is recommended that the practitioner use a small towel or soft lining between the Muscle Meter and the client’s foot.
- Ask the client to cross their arms over their chest, and once set, queue them to press their foot down as best they can, holding for 2-3 seconds until peak force is achieved. It is also important to ensure the client keeps their pelvis glued to the floor throughout the duration of this protocol.
- Once performed, hit save on the Measurz app and compare to the other side.
It's important to ensure that the subject maintains the 90-degree position at the hip and knee throughout the test and avoid any movement of the pelvis or low back. The test should be repeated 2-3 times for each leg, with a rest period of 30 seconds between trials.
There is limited normative data available for hamstring isometric strength measured with a handheld dynamometer during the Hamstring 90/90 test. However, one study by Kellis and Katis (2007) on healthy adults reported the following normative values for peak isometric force during the Hamstring 90/90 test using a muscle meter:
- Males: 190-315 N (Newton)
- Females: 125-230 N
References:
- Ayotte NW, Stetts DM, Keenan G, Greenway EH. Electromyographic and isokinetic peak torque analysis of male and female lower extremity muscles. Journal of Athletic Training. 2007;42(1):34-43. PMID: 17308425.
- Hsieh CF, Walker MJ, Gillis CB, et al. Age-related changes in isometric strength of the hip and knee extensors and flexors in healthy men. Physical Therapy. 1990;70(10):611-617. PMID: 2219552.
- Mentiplay BF, Perraton LG, Bower KJ, Adair B, Pua YH, Williams GP, Clark RA. Assessment of lower limb muscle strength and power using hand-held and fixed dynamometry: a reliability and validity study. PloS one. 2015 Apr 22;10(4):e0128282. doi: 10.1371/journal.pone.0128282. PMID: 25901791; PMCID: PMC4400216.
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