High protein hypoenergetic diet on body composition and performance
Research type
Research Study
Full title
Effects of a high protein hypoenergetic diet vs low protein hypoenergetic diet on weight loss, body composition and exercise test performance in competitive female athletes.
IRAS ID
154762
Contact name
Ian Walshe
Contact email
Sponsor organisation
University of Stirling
Duration of Study in the UK
1 years, 0 months, 1 days
Research summary
30 healthy female competitive athletes between the ages of 18-35 years old from a range of sports will be recruited from competitive local sports clubs and academies. Each subject will participate in 4 visits over a six week study protocol. Visit 1 will be used as a screening and familiarisation session to ensure participants understand what will happen on testing days. If participants meet the inclusion criteria and feel they want to be involved in the study, a Dual Energy X-Ray Absorptiometry (DEXA) scan will be completed to screen and assess baseline body composition measurements of lean mass, fat mass, bone density and total mass. Participants will then become familiar with the exercise tests consisting of Wingate peak power test, a 1 repetition max knee leg extension, a lower body jump test, 20 meter sprint test and finally a shuttle run endurance test. Participants will be given a food diary to fill out over the following week. During the second visit, participants complete the exercise tests, then consume 100% of their habitual energy intake over the following week. The third visit will consist of exercise tests and they will also undergo a DEXA scan. Participants will then be randomly assigned to one of two intervention groups; either a high protein hypoenergetic diet or a normal protein hypoenergetic both at 60% habitual dietary daily energy intake over a two week period. Participants in the high protein group will consume a daily diet consisting of 35% protein, 15% fat and 50% carbohydrate. The low protein group daily dietary intake will consist of 15% protein, 30% fat and 55% carbohydrate. During the fourth visit, at the end of the two week intervention period, body composition will be measured through a DEXA scan. Exercise test performance will also be assessed at this time.
REC name
East of Scotland Research Ethics Service REC 2
REC reference
14/ES/1098
Date of REC Opinion
15 Dec 2014
REC opinion
Further Information Favourable Opinion