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The influence of body composition on respiratory muscle, lung function and diaphragm thickness in adults with cystic fibrosis.
J Cyst Fibros. 2007 Nov 30; 6(6):384-90.JC

Abstract

BACKGROUND

Weight loss and loss of fat-free mass (FFM) are associated with peripheral muscle wasting in cystic fibrosis (CF) although whether this co-exists with loss of diaphragm mass remains unclear.

METHODS

FFM was determined by dual-energy X-ray absorptiometry and bioelectrical impedance in 40 adults with CF and 30 age-matched healthy subjects (HS). Diaphragm thickness at functional residual capacity (FRC) [TDIrel] and total lung capacity (TLC) [TDIcont] and thickening ratio (TR) were assessed by ultrasonography. Inspiratory muscle strength and work capacity were determined by maximal inspiratory pressure (PImax), and sustained PImax (SPImax); pulmonary function (RV, VC and TLC) and physical activity status (PAS) were also determined.

RESULTS

When the CF patients were assessed as a group (low and normal FFM) they had similar age, weight, height and PAS compared to the HS, although patients had lower FFM (p<0.05), VC and TLC than the HS (p<0.01). In addition, although PImax, TDIrel, TDIcont and TR were similar between the patients and the HS, SPImax was lower in the patients (p<0.01). When analyses were made between patients with low versus normal FFM and between patients with low FFM and HS no significant differences were found between overall weight although TDIrel, TDIcont, TR and PAS were all reduced in patients with low FFM (p<0.01).

CONCLUSIONS

PImax is relatively well preserved in adults with CF although there is a relationship between the loss of inspiratory muscle work capacity, FFM, PAS and pulmonary function. Furthermore loss of FFM is associated with loss of diaphragm muscle mass.

Authors+Show Affiliations

Wales College of Medicine, Biology, Life and Health Sciences, Cardiff University, Cardiff CF14 4XN, UK. enrights@cardiff.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17400035

Citation

Enright, Stephanie, et al. "The Influence of Body Composition On Respiratory Muscle, Lung Function and Diaphragm Thickness in Adults With Cystic Fibrosis." Journal of Cystic Fibrosis : Official Journal of the European Cystic Fibrosis Society, vol. 6, no. 6, 2007, pp. 384-90.
Enright S, Chatham K, Ionescu AA, et al. The influence of body composition on respiratory muscle, lung function and diaphragm thickness in adults with cystic fibrosis. J Cyst Fibros. 2007;6(6):384-90.
Enright, S., Chatham, K., Ionescu, A. A., Unnithan, V. B., & Shale, D. J. (2007). The influence of body composition on respiratory muscle, lung function and diaphragm thickness in adults with cystic fibrosis. Journal of Cystic Fibrosis : Official Journal of the European Cystic Fibrosis Society, 6(6), 384-90.
Enright S, et al. The Influence of Body Composition On Respiratory Muscle, Lung Function and Diaphragm Thickness in Adults With Cystic Fibrosis. J Cyst Fibros. 2007 Nov 30;6(6):384-90. PubMed PMID: 17400035.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The influence of body composition on respiratory muscle, lung function and diaphragm thickness in adults with cystic fibrosis. AU - Enright,Stephanie, AU - Chatham,Ken, AU - Ionescu,Alina A, AU - Unnithan,Viswanath B, AU - Shale,Dennis J, Y1 - 2007/04/02/ PY - 2006/07/17/received PY - 2006/11/15/revised PY - 2007/02/27/accepted PY - 2007/4/3/pubmed PY - 2008/2/20/medline PY - 2007/4/3/entrez SP - 384 EP - 90 JF - Journal of cystic fibrosis : official journal of the European Cystic Fibrosis Society JO - J. Cyst. Fibros. VL - 6 IS - 6 N2 - BACKGROUND: Weight loss and loss of fat-free mass (FFM) are associated with peripheral muscle wasting in cystic fibrosis (CF) although whether this co-exists with loss of diaphragm mass remains unclear. METHODS: FFM was determined by dual-energy X-ray absorptiometry and bioelectrical impedance in 40 adults with CF and 30 age-matched healthy subjects (HS). Diaphragm thickness at functional residual capacity (FRC) [TDIrel] and total lung capacity (TLC) [TDIcont] and thickening ratio (TR) were assessed by ultrasonography. Inspiratory muscle strength and work capacity were determined by maximal inspiratory pressure (PImax), and sustained PImax (SPImax); pulmonary function (RV, VC and TLC) and physical activity status (PAS) were also determined. RESULTS: When the CF patients were assessed as a group (low and normal FFM) they had similar age, weight, height and PAS compared to the HS, although patients had lower FFM (p<0.05), VC and TLC than the HS (p<0.01). In addition, although PImax, TDIrel, TDIcont and TR were similar between the patients and the HS, SPImax was lower in the patients (p<0.01). When analyses were made between patients with low versus normal FFM and between patients with low FFM and HS no significant differences were found between overall weight although TDIrel, TDIcont, TR and PAS were all reduced in patients with low FFM (p<0.01). CONCLUSIONS: PImax is relatively well preserved in adults with CF although there is a relationship between the loss of inspiratory muscle work capacity, FFM, PAS and pulmonary function. Furthermore loss of FFM is associated with loss of diaphragm muscle mass. SN - 1569-1993 UR - https://www.unboundmedicine.com/medline/citation/17400035/The_influence_of_body_composition_on_respiratory_muscle_lung_function_and_diaphragm_thickness_in_adults_with_cystic_fibrosis_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1569-1993(07)00029-X DB - PRIME DP - Unbound Medicine ER -