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Open Access Study protocol

Randomized controlled trial of the efficacy of aerobic exercise in reducing metabolic risk in healthy older people: The Hertfordshire Physical Activity Trial

Francis M Finucane1*, Jessica Horton1, Lisa R Purslow1, David B Savage2, Soren Brage1, Hervé Besson1, Kenneth Horton1, Ema De Lucia Rolfe1, Alison Sleigh3, Stephen J Sharp1, Helen J Martin4, Avan Aihie Sayer4, Cyrus Cooper4, Ulf Ekelund1, Simon J Griffin1 and Nicholas J Wareham1

Author Affiliations

1 MRC Epidemiology Unit, Institute of Metabolic Science, Cambridge, UK

2 Metabolic Research Laboratories, Institute of Metabolic Science, Cambridge, UK

3 Wolfson Brain Imaging Centre, University of Cambridge, Cambridge, UK

4 MRC Epidemiology Resource Centre, Southampton, UK

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BMC Endocrine Disorders 2009, 9:15  doi:10.1186/1472-6823-9-15

Published: 19 June 2009

Abstract

Background

While there are compelling observational data confirming that individuals who exercise are healthier, the efficacy of aerobic exercise interventions to reduce metabolic risk and improve insulin sensitivity in older people has not been fully elucidated. Furthermore, while low birth weight has been shown to predict adverse health outcomes later in life, its influence on the response to aerobic exercise is unknown. Our primary objective is to assess the efficacy of a fully supervised twelve week aerobic exercise intervention in reducing clustered metabolic risk in healthy older adults. A secondary objective is to determine the influence of low birth weight on the response to exercise in this group.

Methods/Design

We aim to recruit 100 participants born between 1931–1939, from the Hertfordshire Cohort Study and randomly assign them to no intervention or to 36 fully supervised one hour sessions on a cycle ergometer, over twelve weeks. Each participant will undergo detailed anthropometric and metabolic assessment pre- and post-intervention, including muscle biopsy, magnetic resonance imaging and spectroscopy, objective measurement of physical activity and sub-maximal fitness testing.

Discussion

Given the extensive phenotypic characterization, this study will provide valuable insights into the mechanisms underlying the beneficial effects of aerobic exercise as well as the efficacy, feasibility and safety of such interventions in this age group.

Trial Registration

Current Controlled Trials: ISRCTN60986572