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Published in: BMC Nephrology 1/2017

Open Access 01-12-2017 | Research article

Changes in physical activity and risk of all-cause mortality in patients on maintence hemodialysis: a retrospective cohort study

Authors: Takahiro Shimoda, Ryota Matsuzawa, Kei Yoneki, Manae Harada, Takaaki Watanabe, Mika Matsumoto, Atsushi Yoshida, Yasuo Takeuchi, Atsuhiko Matsunaga

Published in: BMC Nephrology | Issue 1/2017

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Abstract

Background

A previous cohort study indicated a significant association of lower baseline level of physical activity in hemodialysis patients with elevated risks of mortality. However, there have been no reports regarding the association between changes in physical activity over time and mortality in hemodialysis patients. This study was performed to examine the prognostic significance of physical activity changes in hemodialysis patients.

Methods

This retrospective cohort study was performed in 192 hemodialysis patients with a 7-year follow-up. The average number of steps taken per non-dialysis day was used as a measure of physical activity. Forty (20.8%) patients had died during the follow-up period. The percentage change in physical activity between baseline and 12 months was determined, and patients were divided into three categories according to changes in physical activity. A decrease or increase in physical activity > 30% was defined as becoming less or more active, respectively, while decrease or increase in physical activity < 30% were classified as stable.

Results

Forty seven (24.5%), 51 (26.6%), and 94 (49.0%) patients were classified as becoming less active, becoming more active, and stable, respectively. The hazard ratio on multivariate analysis in patients with decreased physical activity was 3.68 (95% confidence interval, 1.55–8.78; P < 0.01) compared to those with increased physical activity.

Conclusions

Reductions in physical activity were significantly associated with poor prognosis independent of not only patient characteristics but also baseline physical activity. Therefore, improved prognosis in hemodialysis patients requires means of preventing a decline in physical activity over time.
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Metadata
Title
Changes in physical activity and risk of all-cause mortality in patients on maintence hemodialysis: a retrospective cohort study
Authors
Takahiro Shimoda
Ryota Matsuzawa
Kei Yoneki
Manae Harada
Takaaki Watanabe
Mika Matsumoto
Atsushi Yoshida
Yasuo Takeuchi
Atsuhiko Matsunaga
Publication date
01-12-2017
Publisher
BioMed Central
Published in
BMC Nephrology / Issue 1/2017
Electronic ISSN: 1471-2369
DOI
https://doi.org/10.1186/s12882-017-0569-7

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