BACKGROUND Accurate measurement of physical behaviour is paramount to better understand lifestyle, health, and functioning, particularly in adults with physical disability as they may be at higher risk of sedentary lifestyle and subsequent negative health consequences. This study aimed: 1) to evaluate the criterion validity of a novel and clinically applicable activity monitor (AM, Activ8), in the detection of body postures and movements in adults with spastic cerebral palsy (CP); and 2) to evaluate the extent that the AM's positioning affects validity. METHODS In this cross-sectional study, 14 ambulatory adults with CP [9 men; mean (SD) age, 35.4 (13.1) years] performed standardized activities while wearing three Activ8 monitors - frontolateral thigh (primary position), frontal thigh, and pant pocket - and being video recorded (criterion measure). AM activity output was compared to synchronized video recordings. Absolute (seconds) and relative [(video time-AM time)/mean time, %] time differences between methods were calculated. Relative time differences of < 10% were indicative of good validity. Comparison of AM attachment positions was completed using Spearman Rho correlation coefficients and Meng's tests. RESULTS Criterion validity of the AM (frontolateral thigh) was good (average relative time differences: 0.25% for sitting, 4.69% for standing, 2.46% for walking, 1.96% for upright activity, 3.19% for cycling), except for running (34.6%). Spearman Rho correlation coefficients were greater between video/frontolateral thigh position than video/frontal thigh position and video/pant pocket position for body posture and movement categories sitting, standing, walking, and upright activity (p < 0.01 for all). CONCLUSIONS The AM, positioned on the frontolateral thigh, demonstrated good criterion validity in ambulatory adults with CP. Though the Activ8 offers potential as an objective measure of physical activity, appropriate positioning is paramount for valid measurement.

中文翻译：

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检测非卧床成人脑瘫的体位和动作：一种新颖有效的身体行为测量方法。

背景技术对身体行为的准确测量对于更好地理解生活方式，健康和功能是至关重要的，特别是在身体残疾的成年人中，因为他们可能有久坐的生活方式和随之而来的负面健康后果的较高风险。这项研究的目的是：1）评价新型和临床适用的活动监测器（AM，Activ8）在检测成人痉挛性脑瘫（CP）的体位和运动中的标准有效性；2）评估AM的定位影响有效性的程度。方法在这项横断面研究中，有14名非门诊成年成人CP [9名男性； 9名男性。平均（SD）年龄，35.4（13.1）岁]戴着三副Activ8监护仪进行了标准化的活动-额外侧大腿（主要位置），额部大腿，和裤子口袋-并进行视频录制（标准衡量）。将AM活动输出与同步视频记录进行比较。计算方法之间的绝对（秒）和相对[（视频时间-AM时间）/平均时间，％]时间差。相对时间差异<10％表示有效期良好。使用Spearman Rho相关系数和Meng's测试完成了AM附着位置的比较。结果AM（前大腿）的标准有效性良好（平均相对时差：坐着0.25％，站立时4.69％，步行2.46％，直立活动1.96％，骑自行车3.19％），跑步除外（34.6） ％）。对于坐姿，站立，行走和直立活动的身体姿势和运动类别，视频/前大腿位置与视频/前大腿位置和视频/裤兜位置之间的Spearman Rho相关系数更大。结论AM位于前额大腿上，在门诊成年CP患者中表现出良好的标准效度。尽管Activ8提供了潜力，可以作为衡量身体活动的客观指标，但正确的定位对于有效的衡量至关重要。