a Nursing and Physiotherapy Department , University of the Balearic Islands , Palma , Spain.
b Physiotherapy Department , Catholic University of San Antonio , Murcia , Spain.
J Sports Sci. 2019 Aug;37(15):1787-1793. doi: 10.1080/02640414.2019.1594570. Epub 2019 Mar 21.
Muscle imbalance and deficit are key parameters for guiding rehabilitation and sports sessions and avoiding injuries. However, the high cost and non-portable nature of most instruments employed for muscle strength assessment frequently hamper an affordable evaluation in field conditions. This study evaluated the validity and reliability of a low-cost digital dynamometer to assess the maximal isometric strength of upper limb muscles. Fourteen physically active volunteers performed the main movements of the upper limb at maximal isometric strength: flexion-extension, internal-external rotation and abduction-adduction of the shoulder; and flexion-extension of both elbow and wrist. Validity was examined by comparing the strength values from the low-cost digital dynamometer and those measured by an isokinetic dynamometer, assumed as the gold standard. The correlation between both devices was perfect (r > 0.913), while Bland-Altman plots showed absolute agreement between both devices, the maximum range of the values of bias was -0.99-1.00 N in wrist extension. Inter-tester and intra-tester reliability were excellent for all movements (ICC ≥ 0.855). The low-cost digital dynamometer showed strong validity and excellent reliability in assessing maximal isometric strength during the main movements of the upper limb. Professionals may use it for an affordable isometric muscle strength assessment in field situations.
肌肉失衡和缺陷是指导康复和运动训练、避免受伤的关键参数。然而，大多数用于肌肉力量评估的仪器成本高且不便于携带，这常常限制了在现场条件下进行经济实惠的评估。本研究评估了一种低成本数字测力计评估上肢肌肉最大等长力量的有效性和可靠性。14 名身体活跃的志愿者以最大等长力量进行上肢的主要运动：肩部的屈伸、内外旋转和外展内收；以及肘部和腕部的屈伸。通过比较低成本数字测力计和被认为是金标准的等速测力计测量的强度值来检验有效性。两种设备之间的相关性非常好（r＞0.913），而 Bland-Altman 图显示两种设备之间的绝对一致性，在腕关节伸展时，偏差值的最大范围为-0.99-1.00N。对于所有运动，测试间和测试内可靠性均非常好（ICC≥0.855）。低成本数字测力计在评估上肢主要运动中的最大等长力量方面具有较强的有效性和良好的可靠性。专业人员可以在现场环境中使用它进行经济实惠的等长肌肉力量评估。
