RELIABILITY OF WIRELESS INSOLE BAROPODOMETRY OF NORMAL INDIVIDUAL’S GAIT

ABSTRACT Objective: The plantar pressure distribution can be assessed quantitatively by computerized baropodometry such as carpet or insole. An insole-type system with wireless transmission was developed and plantar pressure results were previously validated by force platform. However, the reproducibility of the system had not been determined. Our objective was to evaluate the reliability of the results in different gait cycles, clinical characteristics and in different plantar anatomical sites. Methods: 41 healthy adults (age, 34 ± 13 years; body mass index, 25 ± 5 kg/m2; 26 [63%], male, 26 [63%] practicing physical activity) were evaluated. Baropodometer evaluations were performed in 3 walking cycles with 100 m each, and the reliability between the cycles was examined. Pressure points on the heel, first metatarsal, fifth metatarsal and total plantar pressure were analyzed and compared. Results: Moderate agreement was identified between the second and third cycles (ICC, 0.66; 95% CI, 0.14-0.83). Physical activity practitioners showed higher total plantar pressure (70.8 vs 68.2 Kpa; p = 0.04) and higher pressure in the heel (70.7 vs 68.1 Kpa; p = 0.036) in relation to sedentary ones. Conclusion: The insole was able to assess plant pressure with moderate reliability from the adaptation period. Level of Evidence III, Case control study - Investigating a diagnostic test.

摘要
目的：足底压力分布可通过计算机足底压力测量系统（computerized baropodometry）进行定量评估，此类系统涵盖足底垫式与鞋垫式装置。本团队此前已研发一款搭载无线传输功能的鞋垫式足底压力检测系统，并通过测力平台（force platform）验证了其检测结果的有效性，但该系统的检测重复性尚未得到明确。本研究旨在评估该系统在不同步态周期、受试者临床特征及不同足底解剖部位下的检测结果可靠性。
方法：本研究共纳入41名健康成年人，年龄为34±13岁，体质量指数为25±5 kg/m²；其中26名（占比63%）为男性，26名（占比63%）规律参与体育锻炼。所有受试者均完成3次足底压力测量，每次步行距离为100米，并检验各次测量周期间的检测可靠性。本研究对足跟、第一跖骨、第五跖骨的局部压力以及足底总压力等指标进行了分析与比较。
结果：第二与第三次步行周期的检测结果间显示出中等程度的一致性（组内相关系数ICC=0.66；95%置信区间CI：0.14~0.83）。与久坐人群相比，规律体育锻炼者的足底总压力更高（70.8 vs 68.2 kPa；p=0.04），足跟局部压力也显著更高（70.7 vs 68.1 kPa；p=0.036）。
结论：该鞋垫式系统可在适应期后以中等可靠性实现足底压力的有效评估。本研究证据等级为Ⅲ级，属于针对诊断试验的病例对照研究。