Reliabilitet af hånd-holdt dynamometer og overflade EMG ved isometriske kontraktioner i skulderen: Et between-day reliabilitetsstudie
Forfattere
Christensen, Birgitte Hede ; Andersen, Kathrine Skov
Semester
4. semester
Udgivelsesår
2012
Afleveret
2012-06-04
Antal sider
68
Resumé
Formålet var at undersøge between-day reliabilitet af et hånd-holdt dynamometer til måling af isometrisk skulderstyrke (fleksion, abduktion, indad- og udadrotation) samt af overflade-EMG til registrering af muskelaktivitet i m. trapezius superior og m. deltoideus anterior. 24 raske deltagere udførte fire isometriske kontraktioner; styrke blev målt med dynamometer, og EMG blev kvantificeret som absolut og normaliseret RMS. Relativ (ICC) og absolut reliabilitet (Limits of Agreement, LOA) blev beregnet ud fra gennemsnittet af de sidste tre gentagelser. Dynamometeret viste høj reliabilitet (ICC 0,889–0,978; LOA 1,5–7,6 %). For EMG var den relative reliabilitet højere for absolut end for normaliseret RMS (ICC 0,823–0,923 vs. 0,573–0,735), mens den absolutte reliabilitet var lavere (LOA 19,3–69,9 % vs. 47,7–67,4 %). Resultaterne indikerer, at disse effektmål kan anvendes til at detektere ændringer i muskelstyrke og -aktivitet hos patienter efter fx konservativ behandling.
This study evaluated between-day reliability of a hand-held dynamometer for measuring isometric shoulder strength (flexion, abduction, internal and external rotation) and of surface EMG for assessing muscle activity in the upper trapezius and anterior deltoid. Twenty-four healthy participants performed four isometric contractions; strength was measured with the dynamometer, and EMG was quantified using absolute and normalized RMS values. Relative (ICC) and absolute reliability (Limits of Agreement, LOA) were calculated from the mean of the last three repetitions. The dynamometer showed high reliability (ICC 0.889–0.978; LOA 1.5–7.6%). For EMG, relative reliability was higher for absolute compared with normalized RMS (ICC 0.823–0.923 vs. 0.573–0.735), while absolute reliability was lower (LOA 19.3–69.9% vs. 47.7–67.4%). These findings suggest the measures can detect changes in muscle strength and activity in patients following interventions such as conservative treatment.
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