J Sport Rehabil. 2021 Jan 19;30(6):965-968. doi: 10.1123/jsr.2020-0021.
Measuring isometric shoulder rotational strength is clinically important for evaluating motor disability in athletes with shoulder injuries. Recent evidence suggests that handheld dynamometry may provide a low-cost and portable method for the clinical assessment of isometric shoulder strength.
To investigate the concurrent validity and the intrarater and interrater reliability of handheld dynamometry for measuring isometric shoulder rotational strength.
Cross-sectional study.
Biomechanics laboratory.
Thirty-nine young, healthy participants.
The peak isometric strength of the internal rotators and external rotators, measured by handheld dynamometry (in newton) and isokinetic dynamometry (in newton meter).
Maximal isometric shoulder rotational strength was measured as participants lay supine with 90° shoulder abduction, neutral rotation, 90° elbow flexion, and forearm pronation. Measurements were performed independently by 2 different physiotherapists and in 3 different sessions to evaluate interrater and intrarater reliability. The data obtained by handheld dynamometry were compared with those obtained by isokinetic testing to evaluate concurrent validity.
The intraclass correlation coefficients for interrater reliability in measuring maximum isometric shoulder external and internal rotation strength were .914 (95% confidence interval [CI], .842-.954) and .842 (95% CI, .720-.914), respectively. The intrarater reliability values of the method for measuring maximal shoulder external and internal rotation strength were 0.865 (95% CI, 0.757-0.927) and 0.901 (95% CI, 0.820-0.947), respectively. The Pearson correlation coefficients between the handheld and isokinetic dynamometer measurements were .792 (95% CI, .575-.905) for external rotation strength and .664 (95% CI, .419-.839) for internal rotation strength.
The handheld dynamometer showed good to excellent reliability and moderate to good validity in measuring maximum isometric shoulder rotational strength. Therefore, handheld dynamometry could be acceptable for health and sports professionals in field situations to evaluate maximum isometric shoulder rotational strength.
测量等长肩部旋转力量对于评估肩部受伤运动员的运动障碍具有重要的临床意义。最近的证据表明，手持测力计可能为等长肩部力量的临床评估提供一种低成本、便携式的方法。
研究手持测力计测量等长肩部旋转力量的同时效度以及组内和组间信度。
横断面研究。
生物力学实验室。
39 名年轻、健康的参与者。
手持测力计（牛顿）和等速测力计（牛顿米）测量的内旋肌和外旋肌的最大等长力量。
参与者仰卧，肩部外展 90°，中立位旋转，肘部弯曲 90°，前臂旋前，测量最大等长肩部旋转力量。由 2 名不同的理疗师独立进行测量，并在 3 个不同的时间段进行测量，以评估组内和组间信度。手持测力计获得的数据与等速测试获得的数据进行比较，以评估同时效度。
测量最大等长肩部外旋和内旋力量时，组间信度的组内相关系数分别为.914（95%置信区间 [CI]，.842-.954）和.842（95% CI，.720-.914）。该方法测量最大肩部外旋和内旋力量的组内信度值分别为 0.865（95% CI，0.757-0.927）和 0.901（95% CI，0.820-0.947）。手持测力计和等速测力计测量的外旋力量之间的 Pearson 相关系数为.792（95% CI，.575-.905），内旋力量的相关系数为.664（95% CI，.419-.839）。
手持测力计在测量最大等长肩部旋转力量时具有良好到极好的可靠性和中度到良好的有效性。因此，在现场情况下，手持测力计可被健康和运动专业人员接受，用于评估最大等长肩部旋转力量。
