Muscle weakness, health status and frequency of exacerbations in chronic obstructive pulmonary disease
- 1University of Sunderland, Sunderland, UK
- 2Sunderland Royal Hospital, Sunderland, UK
- 3Royal Victoria Infirmary, Newcastle upon Tyne, UK
- 4University of Newcastle upon Tyne, Newcastle upon Tyne, UK
- Correspondence to Dr Khalid Ansari, Faculty of Pharmacy, Health and Wellbeing, University of Sunderland, Sunderland, Tyne and Wear SR1 3SD, UK;
Contributors KA conducted the study and prepared the initial draft of the manuscript. NK, IT and GB selected the subjects for the provided study and contributed to the final written paper. MF provided statistical support.
- Received 1 July 2011
- Accepted 31 January 2012
- Published Online First 2 March 2012
Background Multiple factors contribute to muscle weakness and reduced muscle mass in chronic obstructive pulmonary disease (COPD) and this impacts patients' quality of life. One factor implicated in this process is systemic inflammation, an accompaniment of acute exacerbations. Recurrent exacerbations are associated with lower health status. This study examines the relationship between muscle weaknesses, health status and exacerbation frequency in a cohort of patients with COPD.
Methods This is an observational study of 188 (95 female) patients with COPD attending two hospital clinics in the northeast of England between 2004 and 2007. We measured spirometry, body mass index, health status (St George's Respiratory Questionnaire) and grip strength and recorded Medical Research Council dyspnoea scores and the frequency of exacerbations in the previous year.
Results Patients were aged 72.5±8.3 years (data expressed as mean±SD) with Medical Research Council score of 3.6±0.8, forced expiratory volume in one second (FEV1) of 49.2±21.5 per cent predicted and a total St George's Respiratory Questionnaire score of 72.2±15.5. Grip strength, expressed as per cent predicted, was 72.0±21.8 in men and 81.0±18.2 in women. Exacerbations ranged from zero to five in the previous year and there were associations of reduced grip strength with exacerbation frequency (χ2=9.634; p=0.0019) and lower health status (χ2=34.00; p<0.001).
Conclusion Our data clearly demonstrate that reduction in grip strength occurs more frequently and to a greater extent in patients with a history of frequent exacerbations and is associated with reduced health status.
- Chronic obstructive pulmonary disease
- health related quality of life
- hand grip strength
- muscle weakness
- chronic airways disease
- statistics and research methods
Funding The study is funded by the Higher Education Commission, Islamabad, Pakistan, under the programme ‘Partial Support for Research Studies Abroad’ to a Research Scholar (KA). Reference No. 1-6/HEC/HRD/2006.
Competing interests None.
Ethics approval Local Research Ethical Committee, PCT, Sunderland.
Provenance and peer review Not commissioned; externally peer reviewed.