Kim Sungwan, Glaviano Neal R
Department of Kinesiology, University of Connecticut, Storrs, CT; Institute for Sports Medicine, University of Connecticut, Storrs, CT.
Department of Kinesiology, University of Connecticut, Storrs, CT; Institute for Sports Medicine, University of Connecticut, Storrs, CT.
Arch Phys Med Rehabil. 2025 Jun;106(6):863-870. doi: 10.1016/j.apmr.2024.10.008. Epub 2024 Nov 2.
To (1) compare physical activity variability between individuals with patellofemoral pain (PFP) and pain-free individuals and (2) evaluate the relationships of physical activity variability with pain severity, symptom duration, disability, and pain catastrophizing in PFP cohorts.
Cross-sectional case-control study.
University research laboratory.
Individuals with PFP (N=34) and pain-free individuals (N=34) aged 18 to 40 years.
Not applicable.
We assessed physical activity (daily steps and moderate-to-vigorous physical activity [MVPA]) over a period of 14 consecutive days using a triaxial accelerometer. Variability (coefficient of variation) for daily steps and MVPA was calculated, where higher coefficient of variation values indicate greater physical activity variability. We evaluated pain severity (numeric pain rating scale), symptom duration (months), disability (Knee Injury and Osteoarthritis Outcome Score-Patellofemoral subscale), and pain catastrophizing (Pain Catastrophizing Scale). Independent t tests or Mann-Whitney U tests evaluated group differences in physical activity variability. Spearman ρ correlation coefficients were calculated to determine the relationships of physical activity variability with pain severity, symptom duration, disability, and pain catastrophizing in PFP cohorts. Correlation coefficients were interpreted as weak (<0.40), moderate (0.40-0.70), and strong (>0.70).
Age, height, and mass did not differ between individuals with PFP and pain-free individuals (P>.05). Individuals with PFP displayed greater variability in daily steps (P<.001) and MVPA (P=.001) compared to pain-free individuals. In individuals with PFP, greater variability in daily steps was moderately related to higher pain severity (ρ=0.41, P=.016), while greater variability in MVPA was weakly related to higher pain severity (ρ=0.36, P=.037).
Individuals with PFP demonstrated greater variability in physical activity compared to pain-free individuals, which positively related to more severe pain. Future PFP research should explore the underlying factors contributing to increased physical activity variability and their potential implications for pain management.
（1）比较髌股疼痛（PFP）患者与无疼痛个体之间的身体活动变异性；（2）评估PFP队列中身体活动变异性与疼痛严重程度、症状持续时间、残疾及疼痛灾难化之间的关系。
横断面病例对照研究。
大学研究实验室。
年龄在18至40岁之间的PFP患者（N = 34）和无疼痛个体（N = 34）。
不适用。
我们使用三轴加速度计在连续14天的时间内评估身体活动（每日步数和中度至剧烈身体活动[MVPA]）。计算每日步数和MVPA的变异性（变异系数），变异系数值越高表明身体活动变异性越大。我们评估了疼痛严重程度（数字疼痛评分量表）、症状持续时间（月）、残疾（膝关节损伤和骨关节炎结果评分 - 髌股亚量表）以及疼痛灾难化（疼痛灾难化量表）。采用独立t检验或曼 - 惠特尼U检验评估身体活动变异性的组间差异。计算斯皮尔曼ρ相关系数，以确定PFP队列中身体活动变异性与疼痛严重程度、症状持续时间、残疾及疼痛灾难化之间的关系。相关系数被解释为弱（<0.40）、中度（0.40 - 0.70）和强（>0.70）。
PFP患者与无疼痛个体在年龄、身高和体重方面无差异（P>0.05）。与无疼痛个体相比，PFP患者在每日步数（P<0.001）和MVPA（P = 0.001）方面表现出更大的变异性。在PFP患者中，每日步数的更大变异性与更高的疼痛严重程度中度相关（ρ = 0.41，P = 0.016），而MVPA的更大变异性与更高的疼痛严重程度弱相关（ρ = 0.36，P = 0.037）。
与无疼痛个体相比，PFP患者在身体活动方面表现出更大的变异性，这与更严重的疼痛呈正相关。未来的PFP研究应探索导致身体活动变异性增加的潜在因素及其对疼痛管理的潜在影响。
