科研之友
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摘要
Background: To investigate a simple way to improve the reliability of handheld dynamometer (HHD) measurements using learners. Methods: Maximal voluntary contractions (MVCs) of 21 healthy young adults were tested by 2 HHD learners with the subjects in supine position. The MVCs of the elbow flexor, elbow extensor, hip flexor, and knee extensor were tested bilaterally at two different joint angles. The intraclass correlation coefficients (ICCs) and the smallest real differences (SRD) were used to examine the relative and absolute reliabilities. Bland-Altman analyses were used to assess differences between rater measurements, and paired t-tests were used to check for systematic bias. Results: Reliability was better when the muscle was tested in the weaker position. (E1 < E2 (P < 0.0001), ICCs of E1 (0.78) > E2 (0.76), SRD of E1 (29.7) < E2 (34.6); E3 > E4 (P < 0.0001), ICCs of E3 (0.74) < E4 (0.86), SRD of E3 (38.3) > E4 (25.5); H1 > H2 (P < 0.0001), ICCs of H1 (0.19) < H2 (0.62), SRD of H1 (80.4) > H2 (42.1); K1 < K2 (P = 0.0001), ICCs of K1 (0.22) > K2 (0.06), SRD of K1 (59.0) < K2 (94.5)). Systematic bias existed in one of the testing positions (E4). Conclusions: Changing the joint angle of the limb tested could be a simple way to improve the reliability of handheld dynamometer measurements.
