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Vol. 23. Issue 3.
Pages 221-227 (01 May 2019)
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Vol. 23. Issue 3.
Pages 221-227 (01 May 2019)
Original Research
DOI: 10.1016/j.bjpt.2018.08.001
Knee extensor muscles strength indicates global lower-limb strength in individuals who have suffered a stroke: A cross-sectional study
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Larissa Tavares Aguiar, Júlia Caetano Martins, Sherindan Ayessa Ferreira de Brito, Camila Lima Gervásio Mendes, Luci Fuscaldi Teixeira-Salmela, Christina Danielli Coelho De Morais Faria
Corresponding author
cdcmf@ufmg.br
chrismoraisf@gmail.com

Corresponding author at: Departamento de Fisioterapia, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627 – Campus Pampulha, CEP: 31270-910, Belo Horizonte, MG, Brazil.
Department of Physical Therapy, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
Highlights

  • Knee extensor muscle strength indicates global lower-limb strength following a stroke.

  • The use of a single measure of muscle strength can reduce assessment burden.

  • MST statistical analyses’ results are similar to those seen when using a dynamometer.

  • MST can be used to assess lower-limb strength post-stroke.

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Tables (4)
Table 1. Demographic and clinical characteristics of the participants to determine whether knee extensor muscles strength indicates global lower limb strength in individuals suffering from a stroke.
Table 2. Descriptive statistics regarding the measures of knee extensor muscles and global strength of the paretic lower limb for individuals with subacute and chronic stroke.
Table 3. Correlation coefficients between the strength measurements (i.e. MST and hand-held dynamometer) of the knee extensor muscles and global strength of the paretic lower limb strength as measured by the combined strength values of 6 lower limb muscle groups for individuals with subacute and chronic stroke.
Table 4. Results of the regression models used to indicate whether knee extensor muscles strength indicates global lower-limb strength in individuals who have suffered a stroke.a
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Abstract
Objectives

This study had three aims: (1) to evaluate the relationships between the paretic knee extensor muscle strength and global lower-limb strength in individuals who had suffered a sub-acute/chronic stroke, (2) to determine whether global lower-limb strength, sex, body mass index, or age could predict knee extensor muscle strength, and 3) to investigate whether the results obtained via a Modified Sphygmomanometer Test (MST) would be similar to those obtained using a hand-held dynamometer.

Methods

This was a cross-sectional study, performed at a research laboratory, at participants’ homes, or at outpatient clinics. Forty-two individuals with a sub-acute stroke and 45 individuals with a chronic stroke participated. Maximum isometric strength of the paretic lower-limb muscles (i.e. hip, knee, and ankle flexors/extensors, hip abductors) was measured using the MST and a hand-held dynamometer.

Results

Significant and high correlation coefficients were found between knee extensor muscle strength and global lower-limb strength as measured by the combined strength values of 6 lower limb muscle groups in individuals with sub-acute (0.81r0.88; p<0.05) and chronic (0.82r0.85; p<0.05) stroke. Step-wise multiple regression analysis revealed that only global lower-limb strength was retained in the model and accounted for 66–78% and 67–72% (p<0.001) of the variance in knee extensor muscle strength at the sub-acute and chronic phases post-stroke, respectively. The results obtained via the MST were similar to those obtained using the hand-held dynamometer.

Conclusion

Paretic knee extensor muscles strength, assessed using a MST or a hand-held dynamometer, indicates global lower-limb strength in individuals with a sub-acute or chronic stroke.

Keywords:
Rehabilitation
Physical therapy
Stroke
Muscle strength
Lower extremity
Knee

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