Kim Sungwan, Yoo Takhyun, Burland Julie P, Glaviano Neal R
Kinesiology University of Connecticut.
Int J Sports Phys Ther. 2025 Apr 2;20(4):606-617. doi: 10.26603/001c.133495. eCollection 2025.
Portable dynamometers (PD) are widely used to assess hip muscle strength; however, few studies have explored their validity and agreement when evaluating the rate of torque development (RTD) of hip muscles, particularly with different fixation methods.
HYPOTHESIS/PURPOSE: The purpose of this study was to determine the validity and agreement of isometric hip strength and RTD using the PD with two fixation methods: placing the PD on the body (PDpush) or a treatment table (PDpull), compared to an isokinetic dynamometer (IKD). It was hypothesized that an PD would be a valid tool for assessing hip strength and RTD, with PDpull demonstrating strong validity and PDpush showing moderate validity; and its assessments would yield higher values than those obtained from IKD.
Cross-sectional study.
Twenty healthy, physically active individuals (10 females and 10 males) were included in this study. Hip abduction and extension strength (peak torque) and RTD (early phase: RTD0-100 ms and late phase: RTD100-200 ms) were assessed using PDpush, PDpull, and an IKD.
Moderate-to-strong correlations were found between PD (both PDpush and PDpull) and IKD for all hip strength (r=0.46-0.73; p<0.05) and RTD (r=0.45-0.73, ρ=0.80; p<0.05) measures. PDpull demonstrated strong correlations for hip abduction RTD0-100 ms and hip extension strength and RTD100-200 ms (r=0.70-0.73; p<0.001), whereas PDpush showed moderate correlations (r=0.45-0.58; p<0.05). Bland-Altman plots with mean differences ± 95% limits of agreement indicated that the PDpush method overestimated all hip abduction and extension strength and RTD as compared to IKD. The PDpull method overestimated hip abduction and extension strength but had mixed results for RTD, either underestimating hip abduction RTD while overestimating hip extension RTD.
The PD is valid tool for evaluating hip strength and RTD, with PDpull offering strong validity for certain measures; however, PD measurements did not agree with the absolute values obtained from IKD.
Level 3.
便携式测力计（PD）被广泛用于评估髋部肌肉力量；然而，很少有研究探讨其在评估髋部肌肉扭矩发展速率（RTD）时的有效性和一致性，尤其是在不同固定方法下。
假设/目的：本研究的目的是确定使用PD的两种固定方法（将PD置于身体上[PD推]或治疗台上[PD拉]）与等速测力计（IKD）相比，等长髋部力量和RTD的有效性和一致性。假设PD将是评估髋部力量和RTD的有效工具，其中PD拉显示出强有效性，PD推显示出中等有效性；并且其评估值将高于从IKD获得的值。
横断面研究。
本研究纳入了20名健康、身体活跃的个体（10名女性和10名男性）。使用PD推、PD拉和IKD评估髋外展和伸展力量（峰值扭矩）以及RTD（早期阶段：RTD0 - 100毫秒和晚期阶段：RTD100 - 200毫秒）。
在所有髋部力量（r = 0.46 - 0.73；p < 0.05）和RTD（r = 0.45 - 0.73，ρ = 0.80；p < 0.05）测量中，PD（PD推和PD拉）与IKD之间发现了中度至强的相关性。PD拉在髋外展RTD0 - 100毫秒、髋伸展力量和RTD100 - 200毫秒方面显示出强相关性（r = 0.70 - 0.73；p < 0.001），而PD推显示出中等相关性（r = 0.45 - 0.58；p < 0.05）。具有平均差异±95%一致性界限的Bland - Altman图表明，与IKD相比，PD推方法高估了所有髋外展和伸展力量以及RTD。PD拉方法高估了髋外展和伸展力量，但在RTD方面结果不一，要么低估髋外展RTD，而高估髋伸展RTD。
PD是评估髋部力量和RTD的有效工具，PD拉在某些测量中具有强有效性；然而，PD测量值与从IKD获得的绝对值不一致。
3级。
