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Physiotherapy. 2015 Sep;101(3):298-302. doi: 10.1016/j.physio.2014.12.005. Epub 2015 Mar 2.

Validity of linear encoder measurement of sit-to-stand performance power in older people.

Author information

1
Department of Clinical Gerontology and Rehabilitation, Robert-Bosch-Hospital, Stuttgart, Germany. Electronic address: ulrich.lindemann@rbk.de.
2
Medical Department 4, Internal Medicine, Rheumatology, Osteology & Westgerman Osteoporosis Centre, Klinikum Leverkusen, Leverkusen, Germany; Department of Nephrology, Justus-Liebig University, Giessen, Germany.
3
Department of Clinical Gerontology and Rehabilitation, Robert-Bosch-Hospital, Stuttgart, Germany; Institute of Epidemiology, Ulm University, Ulm, Germany.
4
Department of Radiology and Nuclear Medicine, Robert-Bosch-Hospital, Stuttgart, Germany.
5
Department of Clinical Gerontology and Rehabilitation, Robert-Bosch-Hospital, Stuttgart, Germany.

Abstract

OBJECTIVE:

To investigate construct validity of linear encoder measurement of sit-to-stand performance power in older people by showing associations with relevant functional performance and physiological parameters.

DESIGN:

Cross-sectional study.

SETTING:

Movement laboratory of a geriatric rehabilitation clinic.

PARTICIPANTS:

Eighty-eight community-dwelling, cognitively unimpaired older women (mean age 78 years).

MAIN OUTCOME MEASURES:

Sit-to-stand performance power and leg power were assessed using a linear encoder and the Nottingham Power Rig, respectively. Gait speed was measured on an instrumented walkway. Maximum quadriceps and hand grip strength were assessed using dynamometers. Mid-thigh muscle cross-sectional area of both legs was measured using magnetic resonance imaging.

RESULTS:

Associations of sit-to-stand performance power with power assessed by the Nottingham Power Rig, maximum gait speed and muscle cross-sectional area were r=0.646, r=0.536 and r=0.514, respectively. A linear regression model explained 50% of the variance in sit-to-stand performance power including muscle cross-sectional area (p=0.001), maximum gait speed (p=0.002), and power assessed by the Nottingham Power Rig (p=0.006).

CONCLUSIONS:

Construct validity of linear encoder measurement of sit-to-stand power was shown at functional level and morphological level for older women. This measure could be used in routine clinical practice as well as in large-scale studies.

CLINICAL TRIAL REGISTRATION NUMBER:

DRKS00003622.

KEYWORDS:

Construct validity; Older women; Power; Sit-to-stand

PMID:
25796540
DOI:
10.1016/j.physio.2014.12.005
[Indexed for MEDLINE]

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