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Published in: Trials 1/2018

Open Access 01-12-2018 | Study protocol

The effects of dietary instruction on cardiovascular risk markers after smoking cessation: study protocol for a multicenter randomized controlled trial in Japan

Authors: Maki Komiyama, Yuka Ozaki, Hiromichi Wada, Hajime Yamakage, Noriko Satoh-Asahara, Tatsuya Morimoto, Akira Shimatsu, Yuko Takahashi, Koji Hasegawa

Published in: Trials | Issue 1/2018

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Abstract

Background

Weight gain frequently occurs after smoking cessation (SC); the risk of new-onset diabetes mellitus increases for several years after SC. However, no large-scale, randomized controlled trials have examined the effects of nutritional guidance on post-SC cardiovascular risk. The current trial will enroll individuals who successfully quit smoking with the help of a SC clinic and who gain weight, to determine the effects of nutritional guidance on cardiovascular, glucose, and lipid metabolism biomarkers.

Methods/design

This is a multicenter, prospective, parallel-group, randomized controlled trial. Some 250 individuals who successfully quit smoking with the help of a SC clinic and who gain weight (an increase of ≥ 1.25% Body Mass Index (BMI) between the first and the fifth visit to the SC clinic) will be enrolled within 1 month of the final (fifth) visit to the SC clinic. These participants will be randomly assigned to an intervention group (125 individuals receiving nutritional guidance) or a control group (125 individuals not receiving nutritional guidance). A registered dietitian will provide nutritional guidance once every 3 months for a total of three sessions. The primary endpoint for this trial will be the level of adiponectin, a predictor of cardiovascular risk that reflects weight and smoking status. Secondary endpoints will be levels of cardiovascular, glucose, and lipid metabolism biomarkers, BMI, abdominal circumference, and the percentage of individuals who quit smoking for a prolonged period.

Discussion

This trial will determine the benefits of nutritional guidance with respect to post-SC weight gain. The findings should provide useful information for devising a quality protocol for SC education to prevent cardiovascular disease.

Trial registration

The study is registered at the University Hospital Medical Information Network Clinical Trials Registry (UMIN000030282). Registered on 6 December 2017.
Appendix
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Metadata
Title
The effects of dietary instruction on cardiovascular risk markers after smoking cessation: study protocol for a multicenter randomized controlled trial in Japan
Authors
Maki Komiyama
Yuka Ozaki
Hiromichi Wada
Hajime Yamakage
Noriko Satoh-Asahara
Tatsuya Morimoto
Akira Shimatsu
Yuko Takahashi
Koji Hasegawa
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Trials / Issue 1/2018
Electronic ISSN: 1745-6215
DOI
https://doi.org/10.1186/s13063-018-2919-6

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