The Effect of Different Time-restricted Eating Windows on Body Composition
Phase: NA
Conditions: Time-Restricted Eating (16:8), Fasting
Sponsor: Western University, Canada

 
Western University 2212 3M Centre London, ON, Canada N6A 3K7  
t. 519.661.2111 ext. 88139   f. 519.661.2008 email plemon@uwo.ca   university website www.westernu.ca 
athletics website   www.westernmustangs.ca 
 
 
 
Research Plan 
October 30, 2017 
Purpose 
The purpose of the study is to determine whether the eating window of a time restricted eating protocol affects 
changes in body composition. It is hypothesized that the afternoon group will have better adherence to their 
experimental protocol and have greater changes in body composition.  
 
Sample  
The sample will include 20 healthy adult participants ranging in age from 18-25 that volunteer to participate in 
the study. Participants will be required to have a body mass index above 26 (BMI=weight(kg)/height(m)2). All 
individuals must give written informed consent in order to participate in the study. Exclusion criteria include a 
history of intermittent fasting in the past 6 months, diabetes, or pregnancy and BMI less than 25.9. 
 
Procedure 
Inclusion/exclusion criteria will be explicitly stated throughout the recruitment process.  Potential participants 
will be recruited through advertising using posters placed through the University of Westerns campus as well as 
via presentations in classrooms (using the information from the advertising flyers). Individuals who email Bryce 
Knapp will be invited to a meeting to discuss the study. After the evaluation and information meeting the 
individual will be given up to 3 days to determine if they want to participate and give their informed consent. 
See attached form in the consent section of the ethics application. 
 
Measurement: All individuals will have their body composition measured. Body composition will be measured 
using air displacement densitometry “Bod Pod”. Measurements will be taken twice prior to the intervention and 
twice on successive days post intervention. Individuals will also be asked to fill out a biweekly modified dialysis 
diet and fluid non-adherence questionnaires (DDFQ) with added check boxes to record which days they 
complied with the required protocol and 2 questions regarding any struggles the participants experienced. This 
will be used to assess the adherence to the protocols.  
Protocol: 20 participants matched for BMI will be assigned to one of two groups. The two groups will be 
assigned an eating period of 6am-2pm or 2pm-10pm and instructed not to ingest calories outside of their 
respective eating window. The interventions will last 4 weeks with individuals being asked to comply to their 
eating window a minimum of 5 days per week. This will be measured using the modified DDFQ. All testing will 
be completed by Bryce Knapp under the supervision of Dr. Lemon. The changes in fat mass will be analyzed 
using a 2-way ANOVA and the adherence will be measured using an independent t-test. Post Hoc testing will be 
done if there is any significance in fat mass (p=0.05). SPSS programming will be used to analyze the data. 
 
Sincerely, 
 
 
Peter WR Lemon, PhD, FACSM 
Professor & Weider Research Chair 
Director, Exercise Nutrition Research Laboratory