Reliability of the Q Force; a mobile instrument for measuring isometric quadriceps muscle strength

Rob Douma, G.R.H. Regterschot, Wim Krijnen, Geranda Slager, Cees van der Schans, W. Zijlstra

Onderzoeksoutput: ArticleAcademicpeer review

Uittreksel

Background: The ability to generate muscle strength is a pre-requisite for all human movement. Decreased
quadriceps muscle strength is frequently observed in older adults and is associated with a decreased performance and activity limitations. To quantify the quadriceps muscle strength and to monitor changes over time, instruments and procedures with a sufficient reliability are needed. The Q Force is an innovative mobile muscle strength measurement instrument suitable to measure in various degrees of extension. Measurements between 110 and 130° extension present the highest values and the most significant increase after training.
The objective of this study is to determine the test-retest reliability of muscle strength measurements by the Q
Force in older adults in 110° extension.
Methods: Forty-one healthy older adults, 13 males and 28 females were included in the study. Mean (SD) age was 81.9 (4.89) years. Isometric muscle strength of the Quadriceps muscle was assessed with the Q Force at 110° of knee extension. Participants were measured at two sessions with a three to eight day interval between sessions. To determine relative reliability, the intraclass correlation coefficient (ICC) was calculated. To determine absolute reliability, Bland and Altman Limits of Agreement (LOA) were calculated and t-tests were performed.
Results: Relative reliability of the Q Force is good to excellent as all ICC coefficients are higher than 0.75. Generally a large 95 % LOA, reflecting only moderate absolute reliability, is found as exemplified for the peak torque left leg of −18.6 N to 33.8 N and the right leg of −9.2 N to 26.4 N was between 15.7 and 23.6 Newton representing 25.2 % to 39.9 % of the size of the mean. Small systematic differences in mean were found between measurement session 1 and 2.
Conclusion: The present study shows that the Q Force has excellent relative test-retest reliability, but limited
absolute test-retest reliability. Since the Q Force is relatively cheap and mobile it is suitable for application in various clinical settings, however, its capability to detect changes in muscle force over time is limited but comparable to existing instruments.
Originele taal-2English
Pagina's (van-tot)1-13
TijdschriftBMC sports science, medicine and rehabilitation
Volume8
Nummer van het tijdschrift4
DOI's
StatusPublished - 2016

Vingerafdruk

Quadriceps Muscle
Muscle Strength
Reproducibility of Results
Leg
Torque
Knee
Muscles

Keywords

  • ouderen
  • quadriceps kracht
  • isometrische spierkrachttests
  • q kracht

Citeer dit

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title = "Reliability of the Q Force; a mobile instrument for measuring isometric quadriceps muscle strength",
abstract = "Background: The ability to generate muscle strength is a pre-requisite for all human movement. Decreasedquadriceps muscle strength is frequently observed in older adults and is associated with a decreased performance and activity limitations. To quantify the quadriceps muscle strength and to monitor changes over time, instruments and procedures with a sufficient reliability are needed. The Q Force is an innovative mobile muscle strength measurement instrument suitable to measure in various degrees of extension. Measurements between 110 and 130° extension present the highest values and the most significant increase after training. The objective of this study is to determine the test-retest reliability of muscle strength measurements by the QForce in older adults in 110° extension.Methods: Forty-one healthy older adults, 13 males and 28 females were included in the study. Mean (SD) age was 81.9 (4.89) years. Isometric muscle strength of the Quadriceps muscle was assessed with the Q Force at 110° of knee extension. Participants were measured at two sessions with a three to eight day interval between sessions. To determine relative reliability, the intraclass correlation coefficient (ICC) was calculated. To determine absolute reliability, Bland and Altman Limits of Agreement (LOA) were calculated and t-tests were performed.Results: Relative reliability of the Q Force is good to excellent as all ICC coefficients are higher than 0.75. Generally a large 95 {\%} LOA, reflecting only moderate absolute reliability, is found as exemplified for the peak torque left leg of −18.6 N to 33.8 N and the right leg of −9.2 N to 26.4 N was between 15.7 and 23.6 Newton representing 25.2 {\%} to 39.9 {\%} of the size of the mean. Small systematic differences in mean were found between measurement session 1 and 2.Conclusion: The present study shows that the Q Force has excellent relative test-retest reliability, but limitedabsolute test-retest reliability. Since the Q Force is relatively cheap and mobile it is suitable for application in various clinical settings, however, its capability to detect changes in muscle force over time is limited but comparable to existing instruments.",
keywords = "ouderen, quadriceps kracht, isometrische spierkrachttests, q kracht, elderly people, quadriceps strength, isometric muscle strength, q force",
author = "Rob Douma and G.R.H. Regterschot and Wim Krijnen and Geranda Slager and {van der Schans}, Cees and W. Zijlstra",
year = "2016",
doi = "10.1186/s13102-016-0029-x",
language = "English",
volume = "8",
pages = "1--13",
journal = "BMC sports science, medicine and rehabilitation",
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TY - JOUR

T1 - Reliability of the Q Force; a mobile instrument for measuring isometric quadriceps muscle strength

AU - Douma, Rob

AU - Regterschot, G.R.H.

AU - Krijnen, Wim

AU - Slager, Geranda

AU - van der Schans, Cees

AU - Zijlstra, W.

PY - 2016

Y1 - 2016

N2 - Background: The ability to generate muscle strength is a pre-requisite for all human movement. Decreasedquadriceps muscle strength is frequently observed in older adults and is associated with a decreased performance and activity limitations. To quantify the quadriceps muscle strength and to monitor changes over time, instruments and procedures with a sufficient reliability are needed. The Q Force is an innovative mobile muscle strength measurement instrument suitable to measure in various degrees of extension. Measurements between 110 and 130° extension present the highest values and the most significant increase after training. The objective of this study is to determine the test-retest reliability of muscle strength measurements by the QForce in older adults in 110° extension.Methods: Forty-one healthy older adults, 13 males and 28 females were included in the study. Mean (SD) age was 81.9 (4.89) years. Isometric muscle strength of the Quadriceps muscle was assessed with the Q Force at 110° of knee extension. Participants were measured at two sessions with a three to eight day interval between sessions. To determine relative reliability, the intraclass correlation coefficient (ICC) was calculated. To determine absolute reliability, Bland and Altman Limits of Agreement (LOA) were calculated and t-tests were performed.Results: Relative reliability of the Q Force is good to excellent as all ICC coefficients are higher than 0.75. Generally a large 95 % LOA, reflecting only moderate absolute reliability, is found as exemplified for the peak torque left leg of −18.6 N to 33.8 N and the right leg of −9.2 N to 26.4 N was between 15.7 and 23.6 Newton representing 25.2 % to 39.9 % of the size of the mean. Small systematic differences in mean were found between measurement session 1 and 2.Conclusion: The present study shows that the Q Force has excellent relative test-retest reliability, but limitedabsolute test-retest reliability. Since the Q Force is relatively cheap and mobile it is suitable for application in various clinical settings, however, its capability to detect changes in muscle force over time is limited but comparable to existing instruments.

AB - Background: The ability to generate muscle strength is a pre-requisite for all human movement. Decreasedquadriceps muscle strength is frequently observed in older adults and is associated with a decreased performance and activity limitations. To quantify the quadriceps muscle strength and to monitor changes over time, instruments and procedures with a sufficient reliability are needed. The Q Force is an innovative mobile muscle strength measurement instrument suitable to measure in various degrees of extension. Measurements between 110 and 130° extension present the highest values and the most significant increase after training. The objective of this study is to determine the test-retest reliability of muscle strength measurements by the QForce in older adults in 110° extension.Methods: Forty-one healthy older adults, 13 males and 28 females were included in the study. Mean (SD) age was 81.9 (4.89) years. Isometric muscle strength of the Quadriceps muscle was assessed with the Q Force at 110° of knee extension. Participants were measured at two sessions with a three to eight day interval between sessions. To determine relative reliability, the intraclass correlation coefficient (ICC) was calculated. To determine absolute reliability, Bland and Altman Limits of Agreement (LOA) were calculated and t-tests were performed.Results: Relative reliability of the Q Force is good to excellent as all ICC coefficients are higher than 0.75. Generally a large 95 % LOA, reflecting only moderate absolute reliability, is found as exemplified for the peak torque left leg of −18.6 N to 33.8 N and the right leg of −9.2 N to 26.4 N was between 15.7 and 23.6 Newton representing 25.2 % to 39.9 % of the size of the mean. Small systematic differences in mean were found between measurement session 1 and 2.Conclusion: The present study shows that the Q Force has excellent relative test-retest reliability, but limitedabsolute test-retest reliability. Since the Q Force is relatively cheap and mobile it is suitable for application in various clinical settings, however, its capability to detect changes in muscle force over time is limited but comparable to existing instruments.

KW - ouderen

KW - quadriceps kracht

KW - isometrische spierkrachttests

KW - q kracht

KW - elderly people

KW - quadriceps strength

KW - isometric muscle strength

KW - q force

UR - http://www.mendeley.com/research/reliability-q-force-mobile-instrument-measuring-isometric-quadriceps-muscle-strength

U2 - 10.1186/s13102-016-0029-x

DO - 10.1186/s13102-016-0029-x

M3 - Article

VL - 8

SP - 1

EP - 13

JO - BMC sports science, medicine and rehabilitation

JF - BMC sports science, medicine and rehabilitation

SN - 2052-1847

IS - 4

ER -