Musculoskeletal Group Research, Department of Physical Therapy, Federal University of Juiz de Fora, Brazil.
Musculoskeletal Group Research, Department of Physical Therapy, Federal University of Juiz de Fora, Brazil.
J Bodyw Mov Ther. 2021 Oct;28:433-438. doi: 10.1016/j.jbmt.2021.06.004. Epub 2021 Jun 24.
Inexpensive and practical equipment to assess muscle strength can disseminate objective measures, which can provide valid information to implement effective treatment and exercise training. The purpose of the study was to examine the instrumental validity of the hanging scale (HS) to assess the muscle strength during knee flexion and extension by comparing the peak force values to a standard equipment (laboratory-grade load cell [LLC]). Knee isometric strength was assessed on thirty-two subjects (16 women and 16 men, 22 [5] years, 171 [9] cm, 69 [15] kg, 23 [4] kg/m). The knee flexion was tested by placing the volunteer's body in prone with the knee flexed at 90°. Knee extension was assessed with the volunteer seated on a chair with the feet resting on the floor, knees, and hips flexed at 90°. No differences were observed comparing the isometric peak forces between a laboratory-grade load cell and a HS (p > 0.05). The intraclass correlation coefficient (ICC) returned values above 0.90. The Cronbach's α test also returned values above 0.90 for all comparisons. Bland-Altman results showed high levels of agreement with low risk of bias. The HS appears to be a valid method to assess the knee isometric strength. The portability, the cost-effectiveness and the simple user-friendly system provides an effective way to assess the knee isometric strength.
廉价且实用的肌肉力量评估设备可以传播客观的测量结果，从而为实施有效的治疗和锻炼训练提供有效信息。本研究的目的是通过比较峰值力值与标准设备（实验室级负载单元[LLC]）来检验悬挂秤（HS）评估膝关节屈伸时肌肉力量的仪器有效性。对 32 名受试者（16 名女性和 16 名男性，22[5]岁，171[9]cm，69[15]kg，23[4]kg/m）进行了膝关节等长力量评估。将志愿者的身体置于俯卧位，膝关节弯曲 90°，测试膝关节的屈曲。志愿者坐在椅子上，双脚放在地板上，膝关节和髋关节弯曲 90°，评估膝关节伸展。实验室级负载单元和 HS 之间的等长峰值力无差异（p>0.05）。组内相关系数（ICC）的返回值高于 0.90。所有比较的 Cronbach's α 测试的返回值也高于 0.90。Bland-Altman 结果显示具有高度一致性且偏差风险低。HS 似乎是一种评估膝关节等长力量的有效方法。该设备具有便携性、成本效益和简单易用的系统，为评估膝关节等长力量提供了一种有效的方法。
