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Research ArticleOriginal Research

Functional Tests of Leg Muscle Strength and Power in Adults With Cystic Fibrosis

Emily Sheppard, Kerrie Chang, Jackie Cotton, Sonia Gashgarian, Danny Slack, Kenneth Wu, Anna Michalski, Pat Fox, Anne L Stephenson and Sunita Mathur
Respiratory Care September 2018, respcare.06224; DOI: https://doi.org/10.4187/respcare.06224
Emily Sheppard
Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada.
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Kerrie Chang
Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada.
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Jackie Cotton
Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada.
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Sonia Gashgarian
Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada.
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Danny Slack
Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada.
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Kenneth Wu
Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada.
Adult Cystic Fibrosis Centre, St Michael's Hospital, Toronto, Ontario, Canada.
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Anna Michalski
Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada.
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Pat Fox
Musculoskeletal Health and Outcomes Research, St. Michael's Hospital, Toronto, Ontario, Canada.
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Anne L Stephenson
Adult Cystic Fibrosis Centre, St Michael's Hospital, Toronto, Ontario, Canada.
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Sunita Mathur
Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada.
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  • For correspondence: [email protected]
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Abstract

BACKGROUND: Muscle weakness is an important systemic consequence in adults with cystic fibrosis, but it can be challenging to evaluate clinically. This study examined the validity of lower-extremity functional tests to assess quadriceps muscle strength and muscle power.

METHODS: The subjects underwent 4 functional tests: 30-s sit-to-stand test, stair-climb power test, vertical jump height, and triple hop distance. Quadriceps muscle strength and power were tested by using a dynamometer (the accepted standard). Quadriceps strength was measured from 5 maximum voluntary isometric contractions to obtain peak torque. Quadriceps power was evaluated from the peak power and peak velocity attained during isotonic contractions of the quadriceps at a preset load of 20% of the peak torque. Pearson correlations were used to determine associations between functional tests and accepted measures of quadriceps strength and power.

RESULTS: Fifteen adults with cystic fibrosis (9 males; mean ± SD age, 32 ± 13 y; mean ± SD FEV1% predicted, 73 ± 19) completed the study. The stair-climb power test had the strongest correlations with peak torque (r = 0.84, P < .001) and power (r = 0.65, P = .009). Vertical jump height was moderately correlated with quadriceps strength (r = 0.62, P = .014) and quadriceps peak power (r = 0.51, P = .048). Similarly, triple hop distance had moderate correlations with quadriceps strength (r = 0.78, P = .001) and peak power (r = 0.57, P = .026). The sit-to-stand test was only associated with quadriceps strength (r = 0.55, P = .034).

CONCLUSIONS: Functional tests can be applied clinically to measure leg muscle strength and power, with the stair-climb power test having the strongest associations with the standard measures. The utility of using functional tests to evaluate longitudinal changes in muscle function and its association with clinical outcomes should be examined in cystic fibrosis.

  • cystic fibrosis
  • skeletal muscle
  • muscle strength
  • muscle power
  • quadriceps

Footnotes

  • Correspondence: Sunita Mathur PT PhD, Department of Physical Therapy, University of Toronto, 160–500 University Ave, Toronto, ON M5G 1V7 Canada. E-mail: sunita.mathur{at}utoronto.ca.
  • The authors have disclosed no conflicts of interest.

  • Copyright © 2018 by Daedalus Enterprises
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Respiratory Care: 67 (8)
Respiratory Care
Vol. 67, Issue 8
1 Aug 2022
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Functional Tests of Leg Muscle Strength and Power in Adults With Cystic Fibrosis
Emily Sheppard, Kerrie Chang, Jackie Cotton, Sonia Gashgarian, Danny Slack, Kenneth Wu, Anna Michalski, Pat Fox, Anne L Stephenson, Sunita Mathur
Respiratory Care Sep 2018, respcare.06224; DOI: 10.4187/respcare.06224

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Functional Tests of Leg Muscle Strength and Power in Adults With Cystic Fibrosis
Emily Sheppard, Kerrie Chang, Jackie Cotton, Sonia Gashgarian, Danny Slack, Kenneth Wu, Anna Michalski, Pat Fox, Anne L Stephenson, Sunita Mathur
Respiratory Care Sep 2018, respcare.06224; DOI: 10.4187/respcare.06224
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Keywords

  • cystic fibrosis
  • skeletal muscle
  • muscle strength
  • muscle power
  • quadriceps

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