Association between physical activity and health-related quality of life: time to deterioration model analysis in lung adenocarcinoma

Background and purpose Health-related quality of life (HRQoL) is a key aspect of care for cancer survivors that can be improved by physical activity. Our aim was to explore the relationship between physical activity and time to deterioration (TTD) of the HRQoL in patients with lung adenocarcinoma (LUAD). Methods We conducted a hospital-based prospective study. The International Physical Activity Questionnaire long-form (IPAQ-L) was used to investigate the pre-treatment physical activity levels, and the EORTC Quality of Life Questionnaire version 3.0 (EORTC QLQ-C30) and EORTC Quality of Life Questionnaire-Lung Cancer (EORTC QLQ-LC13) were used to assess HRQoL at baseline and during follow-up. The QoLR package was used to calculate the HRQoL scores and determine TTD events (minimal clinically important difference=5 points). The effect of physical activity on the HRQoL was assessed using Cox regression analysis. Results For EORTC QLQ-C30, TTD events of physical functioning (PF) and dyspnea (DY) in functional scales and symptom scales were the most common during follow-up. Pre-treatment physical activity was found to significantly delay TTD of insomnia ( HR =0.635, 95% CI : 0.437–0.922, P =0.017) and diarrhea ( HR =0.475, 95% CI : 0.291–0.774, P =0.003). For EORTC QLQ-LC13 scales, deterioration of dyspnea (LC-DY) was the most common event. Physical activity was found to delay the TTD of dyspnea ( HR =0.654, 95% CI : 0.474–0.903, P =0.010), sore mouth ( HR =0.457, 95% CI : 0.244–0.856, P =0.015), and dysphagia ( HR =0.315, 95% CI : 0.172–0.580, P