A Smartphone Application to Evaluate Energy Expenditure and Duration of Activities for Overweight and Obese People

Not Applicable

Completed

• Conditions: Obesity; Physical Activity
• Interventions: Behavioral: Controlled conditions; Behavioral: Free-living conditions

• Registration Number: NCT02348554
• Lead Sponsor: Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

Brief Summary

The aim of this study was to validate functions for estimating energy expenditure in controlled and free-living conditions. This method was based on accelerometry data acquired from smartphones worn in a trouser pocket. The developed functions have been compared to the estimations provided by three research devices named Fitmate, Armband and Actiheart.

Detailed Description

There is a growing interest in evaluating physical activity and energy expenditure (EE) to provide feedback to the user. The use of mass-market sensors such as accelerometers offers a promising solution for the general public due to the growing smartphone market over the last decade.

Two previous studies allowed to propose a function named PredEE, which has been tested on normal-weighted volunteers.

This EE estimation function has been tested and improved with data collected from 43 overweight volunteers equipped with smartphones and two or three research sensors (Fitmate, Armband and Actiheart in controlled conditions, and Armband and Actiheart in free-living conditions). Research sensors' data serves as reference during the evaluation and improvement of the proposed function.

This EE estimation function using the smartphone technology is dedicated to light- and moderate-intensity activities, and the investigators believe it can be a new way to help people controlling their daily physical activity level.

Study Timeline

• Study Start: 2013-10
• Primary Completion: 2014-03
• Study Completion: 2014-08
• Study First Submitted: 2014-09-26
• Status Verified: 2015-01
• Study First Submitted QC: 2015-01-22
• Last Update Submitted: 2015-01-22
• Study First Posted: 2015-01-28
• Last Update Posted: 2015-01-28

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 43

Inclusion Criteria

• men and women
• age: 18-60 years
• BMI between 28 and 42 kg/m²
• subject considered as healthy after clinical examination and medical questionnaire
• no pregnant women
• subject with normal rest electrocardiogram (validated by a cardiologist)
• certificate of non-indication against the practice of exercise stress testing delivered by a physician
• subject with normal blood pressure (<140/90 mm Hg) with or without medical treatment
• subject with no foot pad problem
• subject giving his/her written informed consent
• subject willing to comply with study procedures
• affiliated to National Health Insurance

Exclusion Criteria

• respiratory failure or cardiovascular problem
• non-indication against the practice of exercise stress testing
• known cardiac decompensation or myocardial infarction
• surgery made less than 6 months before the study beginning
• pregnant women and nursing mother
• current infectious pathology
• abnormal electrocardiogram
• not affiliated to national health insurance people
• under legal guardianship
• refusal to sign informed consent
• refusal to be registered on the national volunteers data file
• currently participating or who having got 4500€ in this year before to have participated in another clinical trial

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Controlled conditions	Controlled conditions	Volunteers were asked to perform several activities such as walking at different paces, running, sitting, standing still or taking public transportation for about 1h30 They wore 3 research sensors that estimated energy expenditure: Fitmate, Armband and Actiheart. They also wore smartphones (in front pant pockets) that collected accelerometry data.
Free-living conditions	Free-living conditions	Volunteers were asked to wear sensors during about 12 hours, one day. They wore 2 research sensors that estimated energy expenditure: Armband and Actiheart. They also wore smartphones (in front pant pockets) that collected accelerometry data.

Primary Outcome Measures

Name	Time	Method
Accelerometry	1 day	Measures acquired by smartphones including a tri-axial accelerometer

Secondary Outcome Measures

Name	Time	Method
Energy expenditure	1 day	Sensor: Actiheart

Trial Locations

Locations (1)

Centre de Recherche en Nutrition Humaine d'Auvergne; 🇫🇷 Clermont Ferrand, France