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Repeatability and validity of a standardised maximal step-up test for leg function--a diagnostic accuracy study.

Lillemor A Nyberg¹, Mai-Lis Hellénius, Jan Kowalski

¹Center for Family and Community Medicine, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden. lillemor.nyberg@orebroll.se

BMC Musculoskeletal Disorders

|August 23, 2011

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The maximal step up test (MST) is a repeatable and valid leg function test for clinical practice. It correlates with knee extension strength and self-reported physical function, aiding in assessing physical performance.

Area of Science:

Gerontology
Sports Medicine
Rehabilitation Science

Background:

Objectively assessed physical performance predicts morbidity and mortality.
Sarcopenia's role in chronic diseases is increasingly recognized.
There is a clinical need for valid and repeatable functional tests.

Purpose of the Study:

To assess the repeatability and validity of a new maximal step up test (MST).
To evaluate the maximal step-up height (MSH) in healthy middle-aged adults.

Main Methods:

Sixty healthy middle-aged subjects (30 men, 30 women) participated.
Maximal step-up height (MSH) was measured in 3-cm increments.
Repeatability, correlation with isokinetic knee extension peak torque (IKEPT), and self-reported physical function (SF-36 PF) were analyzed.

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Main Results:

The MST demonstrated good repeatability (6 cm between occasions/testers).
MSH significantly correlated with IKEPT (r=0.68), SF-36 PF (r=0.29), sex, age, weight, and BMI.
MSH above 32 cm identified subjects without self-reported physical limitations.

Conclusions:

The standardized MST is a reliable leg function test for clinical use.
MSH is related to knee extension strength and self-reported physical function.
Further research is needed to confirm MST's precision in identifying physical function limitations.