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J Ren Nutr. 2011 Nov;21(6):429-37. doi: 10.1053/j.jrn.2010.09.007. Epub 2011 Jan 15.

Association of self-reported physical activity with laboratory markers of nutrition and inflammation: the Comprehensive Dialysis Study.

Author information

1
Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Palo Alto, California, USA. sanand2@stanford.edu

Abstract

OBJECTIVE:

Patients on dialysis maintain extremely low levels of physical activity. Prior studies have demonstrated a direct correlation between nutrition and physical activity but provide conflicting data on the link between inflammation and physical activity. Using a cohort of patients new to dialysis from the Comprehensive Dialysis Study (CDS), we examined associations of self-reported physical activity with laboratory markers of nutrition and inflammation.

DESIGN, SETTING, AND PATIENTS:

Between June 2005 and June 2007, CDS collected data on self-reported physical activity, nutrition, and health-related quality of life from patients starting dialysis in 296 facilities located throughout the United States. Baseline serum samples were collected from participants in a nutrition sub-study of CDS.

MEASURES:

Serum albumin and prealbumin were measured as markers of nutrition, and C-reactive protein (CRP) and α-1-acid glycoprotein as markers of inflammation. Self-reported physical activity was characterized by the maximum activity score (MAS) and adjusted activity score (AAS) of the Human Activity Profile.

RESULTS:

The mean age of participants in the analytic cohort (n = 201) was 61 years. The MAS and AAS were below the 10th and first percentile, respectively, in comparison with healthy 60 year-old norms. Both activity scores were directly correlated with albumin (r(2) = 0.3, P < .0001) and prealbumin (r(2) = 0.3, P < .0001), and inversely correlated with CRP (AAS: r(2) = -0.2, P = .01; MAS: r(2) = -0.1, P = .08). In multivariate analyses adjusting for age, gender, race/ethnicity, diabetes status, and center, both activity scores were directly correlated with prealbumin and inversely correlated with CRP.

CONCLUSIONS:

Patients new to dialysis with laboratory-based evidence of malnutrition and/or inflammation are likely to report lower levels of physical activity.

PMID:
21239185
PMCID:
PMC3124610
DOI:
10.1053/j.jrn.2010.09.007
[Indexed for MEDLINE]
Free PMC Article
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