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The relationship between isokinetic and isometric knee muscle strength and maximal step-up height after stroke: A pilot study.

Carlsson, Håkan; Lexell, Jan LU and Brogårdh, Christina LU (2015) In Isokinetics and Exercise Science 23(3). p.143-149
Abstract
BACKGROUND: A novel way to evaluate muscle strength and functioning in the lower limbs is to measure how high a person could step up on a platform, the so called Maximal Step-up Test (MST). Studies of healthy persons and overweight women have shown that the maximal step-up height (MSH) is associated with both muscle strength and physical function, but no study has assessed persons after stroke. OBJECTIVE: To evaluate the relationship between isokinetic and isometric knee muscle strength and maximal step-up height after stroke. METHODS: A convenience sample of 21 ambulatory persons with stroke (13 men and eight women; mean age 63 +/- 12 years; mean time since stroke onset 26 +/- 36 months). Isokinetic concentric knee extension and knee... (More)
BACKGROUND: A novel way to evaluate muscle strength and functioning in the lower limbs is to measure how high a person could step up on a platform, the so called Maximal Step-up Test (MST). Studies of healthy persons and overweight women have shown that the maximal step-up height (MSH) is associated with both muscle strength and physical function, but no study has assessed persons after stroke. OBJECTIVE: To evaluate the relationship between isokinetic and isometric knee muscle strength and maximal step-up height after stroke. METHODS: A convenience sample of 21 ambulatory persons with stroke (13 men and eight women; mean age 63 +/- 12 years; mean time since stroke onset 26 +/- 36 months). Isokinetic concentric knee extension and knee flexion strength at 60 degrees/s and isometric knee extension strength at 90. were measured for both lower limbs with a Biodex dynamometer. Maximal step-up height was measured using a 40 cm x 60 cm platform, which could be raised from 3 cm to 45 cm with 3 cm intervals. The relationship between knee muscle strength (normalized to body weight) and the maximal step-up height was analysed with the Pearson's correlation coefficient (r). RESULTS: There were significant but only moderate relationships between the paretic isokinetic knee extension, and flexion, strength and maximal step-up height, r = 0.49; p < 0.05, and r = 0.57; p < 0.01, respectively. CONCLUSION: These moderate relationships indicate that muscle weakness is only partially associated with maximal step-up height after stroke. The MST may therefore have limited value in the assessment of muscle strength after stroke. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Stroke, knee muscle strength, maximal step-up
in
Isokinetics and Exercise Science
volume
23
issue
3
pages
143 - 149
publisher
IOS Press
external identifiers
  • wos:000360393000001
  • scopus:84940029538
ISSN
1878-5913
DOI
10.3233/IES-150574
language
English
LU publication?
yes
id
8428fb55-45f9-4d28-a9a3-c8f44b7a2ba6 (old id 7985387)
date added to LUP
2016-01-26 11:45:10
date last changed
2017-01-01 03:12:46
@article{8428fb55-45f9-4d28-a9a3-c8f44b7a2ba6,
  abstract     = {BACKGROUND: A novel way to evaluate muscle strength and functioning in the lower limbs is to measure how high a person could step up on a platform, the so called Maximal Step-up Test (MST). Studies of healthy persons and overweight women have shown that the maximal step-up height (MSH) is associated with both muscle strength and physical function, but no study has assessed persons after stroke. OBJECTIVE: To evaluate the relationship between isokinetic and isometric knee muscle strength and maximal step-up height after stroke. METHODS: A convenience sample of 21 ambulatory persons with stroke (13 men and eight women; mean age 63 +/- 12 years; mean time since stroke onset 26 +/- 36 months). Isokinetic concentric knee extension and knee flexion strength at 60 degrees/s and isometric knee extension strength at 90. were measured for both lower limbs with a Biodex dynamometer. Maximal step-up height was measured using a 40 cm x 60 cm platform, which could be raised from 3 cm to 45 cm with 3 cm intervals. The relationship between knee muscle strength (normalized to body weight) and the maximal step-up height was analysed with the Pearson's correlation coefficient (r). RESULTS: There were significant but only moderate relationships between the paretic isokinetic knee extension, and flexion, strength and maximal step-up height, r = 0.49; p &lt; 0.05, and r = 0.57; p &lt; 0.01, respectively. CONCLUSION: These moderate relationships indicate that muscle weakness is only partially associated with maximal step-up height after stroke. The MST may therefore have limited value in the assessment of muscle strength after stroke.},
  author       = {Carlsson, Håkan and Lexell, Jan and Brogårdh, Christina},
  issn         = {1878-5913},
  keyword      = {Stroke,knee muscle strength,maximal step-up},
  language     = {eng},
  number       = {3},
  pages        = {143--149},
  publisher    = {IOS Press},
  series       = {Isokinetics and Exercise Science},
  title        = {The relationship between isokinetic and isometric knee muscle strength and maximal step-up height after stroke: A pilot study.},
  url          = {http://dx.doi.org/10.3233/IES-150574},
  volume       = {23},
  year         = {2015},
}