Grant E Norte1, Jamie L Frye2, Joseph M Hart1. 1. Department of Kinesiology, University of Virginia, Charlottesville; 2. Department of Health Sciences, James Madison University, Harrisonburg, VA.
Abstract
CONTEXT: The superimposed-burst (SIB) technique is commonly used to quantify central activation failure after knee-joint injury, but its reliability has not been established in pathologic cohorts. OBJECTIVE: To assess within-session and between-sessions reliability of the SIB technique in patients with patellofemoral pain. DESIGN: Descriptive laboratory study. SETTING: University laboratory. PATIENTS OR OTHER PARTICIPANTS: A total of 10 patients with self-reported patellofemoral pain (1 man, 9 women; age = 24.1 ± 3.8 years, height = 167.8 ± 15.2 cm, mass = 71.6 ± 17.5 kg) and 10 healthy control participants (3 men, 7 women; age = 27.4 ± 5.0 years, height = 173.5 ± 9.9 cm, mass = 78.2 ± 16.5 kg) volunteered. INTERVENTION(S): Participants were assessed at 6 intervals spanning 21 days. Intraclass correlation coefficients (ICCs [3,3]) were used to assess reliability. MAIN OUTCOME MEASURE(S): Quadriceps central activation ratio, knee-extension maximal voluntary isometric contraction force, and SIB force. RESULTS: The quadriceps central activation ratio was highly reliable within session (ICC [3,3] = 0.97) and between sessions through day 21 (ICC [3,3] = 0.90-0.95). Acceptable reliability of knee extension (ICC [3,3] = 0.75-0.91) and SIB force (ICC [3,3] = 0.77-0.89) was observed through day 21. CONCLUSIONS: The SIB technique was reliable for clinical research up to 21 days in patients with patellofemoral pain.
CONTEXT: The superimposed-burst (SIB) technique is commonly used to quantify central activation failure after knee-joint injury, but its reliability has not been established in pathologic cohorts. OBJECTIVE: To assess within-session and between-sessions reliability of the SIB technique in patients with patellofemoral pain. DESIGN: Descriptive laboratory study. SETTING: University laboratory. PATIENTS OR OTHER PARTICIPANTS: A total of 10 patients with self-reported patellofemoral pain (1 man, 9 women; age = 24.1 ± 3.8 years, height = 167.8 ± 15.2 cm, mass = 71.6 ± 17.5 kg) and 10 healthy control participants (3 men, 7 women; age = 27.4 ± 5.0 years, height = 173.5 ± 9.9 cm, mass = 78.2 ± 16.5 kg) volunteered. INTERVENTION(S): Participants were assessed at 6 intervals spanning 21 days. Intraclass correlation coefficients (ICCs [3,3]) were used to assess reliability. MAIN OUTCOME MEASURE(S): Quadriceps central activation ratio, knee-extension maximal voluntary isometric contraction force, and SIB force. RESULTS: The quadriceps central activation ratio was highly reliable within session (ICC [3,3] = 0.97) and between sessions through day 21 (ICC [3,3] = 0.90-0.95). Acceptable reliability of knee extension (ICC [3,3] = 0.75-0.91) and SIB force (ICC [3,3] = 0.77-0.89) was observed through day 21. CONCLUSIONS: The SIB technique was reliable for clinical research up to 21 days in patients with patellofemoral pain.
Entities:
Keywords:
central activation ratio; knee; quadriceps muscles
Authors: Joseph M Hart; Julie M Fritz; D Casey Kerrigan; Ethan N Saliba; Bruce M Gansneder; Christopher D Ingersoll Journal: J Athl Train Date: 2006 Jan-Mar Impact factor: 2.860
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