# Evaluating Changes in Physical Activity and Clinical Outcomes During Post-Hospitalisation Rehabilitation for Persons with COPD: A Prospective Observational Cohort Study

## TL;DR

A study found that physical activity levels in COPD patients did not improve during post-hospitalization rehabilitation, despite better self-reported health.

## Contribution

The study introduces triaxial accelerometers to objectively track physical activity during COPD rehabilitation, revealing discrepancies between self-reported and objective outcomes.

## Key findings

- Physical activity levels measured by accelerometers remained stable during an 8-week rehabilitation program.
- Self-perceived health improved, but lung function and quality of life scores did not significantly change.
- Some functional parameters like gait speed declined despite perceived health improvements.

## Abstract

What are the main findings?
Triaxial accelerometers provided detailed patterns of daily physical activity during post-hospitalisation rehabilitation after acute exacerbation of COPD.Despite improved self-perceived health, accelerometer-derived physical activity levels and clinical outcomes remained stable throughout the 8-week exercise program.

Triaxial accelerometers provided detailed patterns of daily physical activity during post-hospitalisation rehabilitation after acute exacerbation of COPD.

Despite improved self-perceived health, accelerometer-derived physical activity levels and clinical outcomes remained stable throughout the 8-week exercise program.

What are the implications of the main findings?
Continuous accelerometer monitoring can complement clinical and patient-reported outcomes in evaluating rehabilitation interventions.Findings highlight the potential of sensor-based assessments to support personalised and long-term rehabilitation strategies after hospitalisation.

Continuous accelerometer monitoring can complement clinical and patient-reported outcomes in evaluating rehabilitation interventions.

Findings highlight the potential of sensor-based assessments to support personalised and long-term rehabilitation strategies after hospitalisation.

Physical activity often remains low after hospitalisation for acute exacerbation of Chronic Obstructive Pulmonary Disease (AECOPD). Although post-hospitalisation rehabilitation has shown to support recovery, its impact on daily activity levels in the early post-exacerbation phase is unclear. This study describes the changes in physical activity (PA) and clinical outcomes during an 8-week rehabilitation following hospitalisation for AECOPD. This prospective observational cohort study included patients recently discharged after AECOPD from Aalborg University Hospital, Denmark. Participants received municipality-delivered post-hospitalisation rehabilitation consisting of tailored physiotherapy and occupational therapy of individually determined frequency. PA was assessed using thigh-worn triaxial accelerometers measuring 24 h/day over 8 weeks. Clinical outcomes included lung function (FEV1% predicted), dyspnoea scores, health-related quality of life (EuroQol 5-dimension, 5-level (EQ-5D-5L); EuroQol visual analogue scale (EQ-VAS)), frailty (Clinical Frailty Scale (CFS)), functional status (Short Physical Performance Battery (SPPB)), and symptom burden (COPD Assessment Test (CAT); St. George’s Respiratory Questionnaire (SGRQ)). Changes from baseline to 8 weeks were analysed using linear mixed-effects models and bootstrap resampling. Forty-three participants with a mean age 73.4 years, 67.4% female, and moderate frailty (CFS 5.4 ± 1.3) were included. Physical activity remained largely unchanged. Gait speed and total SPPB declined, whereas self-perceived health improved (EQ-VAS Δ +7.8, p = 0.008). Lung function, dyspnoea, and health related quality of life scores showed no significant change. In this frail, recently admitted COPD population, physical activity did not increase during the rehabilitation period, and some functional parameters declined. The improvement in self-perceived health suggests a divergence between subjective and objective outcomes. These findings highlight the need for long-term, tailored, and flexible approaches to support recovery after AECOPD.