The Effect of Physical Activity Intervention Flexibility on the Time Course of Changes in Body Composition and Metabolism

Not Applicable

• Conditions: Overweight; Sedentary
• Interventions: Other: Exercise

• Registration Number: NCT02020239
• Lead Sponsor: University of Birmingham

Brief Summary

The investigators goal is to optimise physical activity interventions to help previously inactive women improve their body shape and composition. Many people seeking to lose weight or improve body composition initiate an exercise programme. The most common recommendation of an exercise intervention for someone attempting to manage their weight, has been to 'prescribe' the recommended 150 minutes of exercise per week (World Health Organisation), often using one mode of exercise. An alternative approach might be to offer a portfolio of activities, from which the exerciser can pick and choose, to facilitate greater amounts of physical activity. The problem with this is how do you account for the different intensities of walking, washing the car, playing badminton, cycling, jogging, etc? In this study, the investigators will try to overcome this barrier by allocating a number of "physical activity points" to each activity. Using this physical activity points system, participants will be provided with a points target that they can meet using any combination of activities.

The investigators research aim is therefore to compare this points-based system against the traditional 5x30minute prescription (and sedentary control) for their ability to help previously inactive women to drop a dress size, increase fat burning, positively change their body composition and tone their tummy.

Detailed Description

Not available

Study Timeline

• Study Start: 2013-12
• Study First Submitted: 2013-12-12
• Study First Submitted QC: 2013-12-18
• Study First Posted: 2013-12-24
• Status Verified: 2016-10
• Last Update Submitted: 2016-10-27
• Last Update Posted: 2016-10-28
• Primary Completion: 2017-12
• Study Completion: 2017-12

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: Female
• Target Recruitment: 60

Inclusion Criteria

• Female
• Aged 25-50 years old
• Inactive (less than 150 minutes of moderate-intensity aerobic physical activity per week)
• BMI 25-35 kg/m2
• Good general health, as assessed by the School of Sport, Exercise and Rehabilitation Sciences' General Health Questionnaire
• Willing to strictly comply with all study procedures and restrictions
• Willing to participate, as demonstrated by voluntary written informed consent

Exclusion Criteria

• Positive result from the urine sample pregnancy test
• Currently breast feeding
• Currently participating in another clinical trial deemed to potentially interfere with this study
• Current or recent (within the last 30 days) smoker
• Currently taking prescription or non-prescription medication that may interfere with metabolism (including beta-blockers, insulin, bronchodilators, anti-inflammatory agents, thyroxine and medication/supplements that in the opinion of the investigators may affect metabolism).

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Prescribed exercise	Exercise	Participants will be asked to choose one activity and stick to it for the duration of the intervention. Participants will be able to choose between brisk walking/slow jogging or cycling. The intervention will require the completion of 30 minutes of chosen activity on 5 days of the week, which will be recorded in a physical activity diary.
Points-based physical activity	Exercise	Participants will be asked to achieve a pre-set, individualised points target for physical activity each week. Points are acquired through the completion of a minimum 10 minutes of activity, choosing from the extensive list of activities provided; for example, 10 minutes of jogging achieves 4.5 points, whereas 10 minutes of washing a car achieves 1.5 points. The target will be 35-40 points per week, which equates to approximately 6 points per day. Any combination of activity, duration and frequency can be selected.

Primary Outcome Measures

Name	Time	Method
Change in body composition (fat and fat-free mass in kg)	4 weeks, 12 weeks and 24 weeks

Secondary Outcome Measures

Name	Time	Method
Maximal aerobic capacity	4 weeks, 12 weeks, 24 weeks
Fat oxidation rates	4 weeks, 12 weeks and 24 weeks
Body tone	4 weeks, 12 weeks, 24 weeks
Perceived body shape	4 weeks, 12 weeks and 24 weeks

Trial Locations

Locations (1)

University of Birmingham, School of Sport, Exercise and Rehabilitation Sciences; 🇬🇧 Birmingham, United Kingdom