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

Douma KW, Regterschot GR, Krijnen WP, Slager GE, van der Schans CP, Zijlstra W - BMC Sports Sci Med Rehabil (2016)

Bottom Line: Decreased quadriceps muscle strength is frequently observed in older adults and is associated with a decreased performance and activity limitations.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.

View Article: PubMed Central - PubMed

Affiliation: Research and Innovation Group in Healthy Aging, Allied Health Care and Nursing, Hanze University of Applied Sciences Groningen, Groningen, The Netherlands ; Department of Rehabilitation Medicine, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.

ABSTRACT

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.

No MeSH data available.


Graphic representation
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Fig3: Graphic representation

Mentions: The chair incorporates a solid frame, base, back support, and a seat. Bars are fitted at both sides of the seat for manual fixation. The height of the sitting surface is fully adjustable. At the left and right bottom of the seat, in an anterior posterior direction, rails are attached to which the brace is connected so that both the left and right leg can be tested. The fixed brace consists of a fixed horizontal and an adjustable distal component with a hinge in between; the brace can be slid horizontally via rails. The brace is adjustable to fit the subject’s upper leg dimensions. This affords placing the rotation axle of the brace in the same position as the rotation axle of the knee for that specific angle (Fig. 3). The measuring angle of the fixed brace is adjustable between 90° and 180°. The force transducer is covered with a pad to minimize pressure on the subject’s lower leg. The position of the pad is adjustable in vertical and horizontal directions in accordance with the subject’s dimensions.


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

Douma KW, Regterschot GR, Krijnen WP, Slager GE, van der Schans CP, Zijlstra W - BMC Sports Sci Med Rehabil (2016)

Graphic representation
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4759727&req=5

Fig3: Graphic representation
Mentions: The chair incorporates a solid frame, base, back support, and a seat. Bars are fitted at both sides of the seat for manual fixation. The height of the sitting surface is fully adjustable. At the left and right bottom of the seat, in an anterior posterior direction, rails are attached to which the brace is connected so that both the left and right leg can be tested. The fixed brace consists of a fixed horizontal and an adjustable distal component with a hinge in between; the brace can be slid horizontally via rails. The brace is adjustable to fit the subject’s upper leg dimensions. This affords placing the rotation axle of the brace in the same position as the rotation axle of the knee for that specific angle (Fig. 3). The measuring angle of the fixed brace is adjustable between 90° and 180°. The force transducer is covered with a pad to minimize pressure on the subject’s lower leg. The position of the pad is adjustable in vertical and horizontal directions in accordance with the subject’s dimensions.

Bottom Line: Decreased quadriceps muscle strength is frequently observed in older adults and is associated with a decreased performance and activity limitations.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.

View Article: PubMed Central - PubMed

Affiliation: Research and Innovation Group in Healthy Aging, Allied Health Care and Nursing, Hanze University of Applied Sciences Groningen, Groningen, The Netherlands ; Department of Rehabilitation Medicine, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.

ABSTRACT

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.

No MeSH data available.