Closed chain assessment of quadriceps activation using the superimposed burst technique |
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Institution: | 1. Department of Maternal and Child Health, The Delivery Unit, Nordland Hospital, Bodø, Norway;2. Department of Emergency Medicine, Nordland Hospital, Bodø, Norway;3. The University of Nordland, Norway;4. The University of Tromsø, Norway |
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Abstract: | The superimposed burst technique is used to estimate quadriceps central activation ratio during a maximal voluntary isometric contraction, which is calculated from force data during an open-chain knee extension task. Assessing quadriceps activation in a closed-chain position would more closely simulate the action of the quadriceps during activity. Our aim was to determine the test–retest reliability of the quadriceps central activation ratio in the closed chain.MethodsTwenty-two healthy, active volunteers (13M/12F; age = 23.8 ± 3; height = 72.7 ± 14.5 cm; mass = 175.3 ± 9.6 kg) were recruited to participate. Knee extension MVIC torque and the peak torque during a superimposed electrical stimulus delivered to the quadriceps during an MVIC were measured to estimate quadriceps CAR. Interclass correlation coefficients were used to assess test–retest reliability between sessions, and Bland–Altman plots to graphically assess agreement between sessions.ResultsTest–retest reliability was fair for CAR (ICC2,k = 0.68; P = 0.005), with a mean difference of ?2.8 ± 10.3%, and limits of agreement ranging ?23.1–18.1%.ConclusionsCAR calculated using the superimposed burst technique is moderately reliable in a closed-chain position using technique-based instruction. Although acceptable reliability was demonstrated, wide limits of agreement suggest high variability between sessions. |
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Keywords: | Central activation ratio Electrical stimulation Test–retest reliability |
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