Robinson M E, Mac Millan M, O'Connor P, Fuller A, Cassisi J E
Department of Clinical and Health Psychology, Shands Hospital, University of Florida, Gainesville 32610.
J Spinal Disord. 1991 Dec;4(4):444-8. doi: 10.1097/00002517-199112000-00006.
The purpose of this study was to investigate the differences in test-retest reliability between maximal and submaximal efforts in an isometric lumbar extension task and to test the hypothesis that submaximal efforts would be less consistent than maximal efforts. Twenty subjects were asked to produce maximum voluntary contractions at seven different positions in a lumbar extension machine. Each subject was tested twice in a maximal-effort condition and twice in a 50% effort condition. The order of the effort conditions was counterbalanced across subjects so that half of the subjects performed the maximal-effort tests first and half performed the submaximal effort first. Results indicated high test-retest correlations at all angles in both conditions. There were no differences in test-retest reliability between effort conditions. Therapist ratings of consistency did not differ between conditions, and therapists could not discriminate between conditions on the basis of effort consistency. Because subjects could reliably reproduce a submaximal effort, it was concluded that consistency interpretations of isometric strength testing may be misleading.
本研究的目的是调查在等长腰椎伸展任务中，最大用力和次最大用力之间重测信度的差异，并检验次最大用力比最大用力一致性更低的假设。20名受试者被要求在腰椎伸展器械的七个不同位置产生最大自主收缩。每位受试者在最大用力条件下测试两次，在50%用力条件下测试两次。用力条件的顺序在受试者之间进行了平衡，以便一半受试者先进行最大用力测试，另一半先进行次最大用力测试。结果表明，两种条件下在所有角度的重测相关性都很高。用力条件之间的重测信度没有差异。治疗师对一致性的评分在不同条件下没有差异，并且治疗师无法根据用力一致性区分不同条件。由于受试者能够可靠地再现次最大用力，因此得出结论，等长力量测试的一致性解释可能会产生误导。
