ArticleJMA journal2026
Preoperative Patient-reported Physical Functioning and Postoperative Wearable-measured Physical Activity in Cancer Patients: A Secondary Analysis of the SCRUM-MONSTAR LIFELOG Study.
Article in JMA journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: It remains unclear whether preoperative patient-reported physical functioning (PF) correlates with postoperative wearable-measured physical activity in cancer patients. Clarifying this relationship could indicate whether brief self-report items capture information relevant to subsequent postoperative outpatient activity. Methods: We analyzed 119 postoperative cancer patients from the SCRUM-MONSTAR LIFELOG study using four preoperative Medical Outcomes Study Short Form-36 (SF-36) PF items (stair climbing, vigorous activity, moderate activity, and carrying items; composite score 0-8), the Geriatric-8 (G8) screening tool, and wrist-based wearable accelerometry data. Spearman rank correlations, Wilcoxon rank-sum tests, and overlap-weighted analyses adjusted for clinical covariates were performed. Exploratory residual-based analyses examined the discordance between preoperative assessment and postoperative activity. Results: Patients with full PF (PF = 8; n = 53) versus impaired PF (PF < 8; n = 66) showed lower sedentary time (median 83.6% vs 87.3%; p = 0.031), higher moderate-to-vigorous physical activity (MVPA; 4.1% vs 2.7%; p = 0.015), and higher mean acceleration (21.8 vs 16.8 milligravity units; p = 0.044). All four SF-36 PF items showed consistent associations with sedentary time (Spearman ρ: -0.24 to -0.27) and MVPA (ρ: +0.23 to +0.29). G8-vulnerable patients showed higher sedentary time (87.2% vs 82.7%; p = 0.021) and lower MVPA (2.9% vs 4.1%; p = 0.045). After overlap-weighted adjustment, differences were attenuated. In exploratory analyses, age showed the most consistent, although weak, association with the discrepancy between preoperative assessment and postoperative activity. Conclusions: The preoperative SF-36 PF items showed weak but consistent unadjusted associations with postoperative physical activity, although attenuated after adjustment for baseline clinical covariates. These findings suggest that brief preoperative self-report items may capture information relevant to subsequent physical activity behavior in cancer patients, with group-level differences partly reflecting shared clinical context.
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