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An Examination of Sex Specific Differences in Glucose Responses Using the Exercise – Physical Activity and Diabetes Glucose Monitoring (E-PAraDiGM) Protocol Open Access

Descriptions

Other title
Subject/Keyword
Continuous Glucose Monitor
Exercise
Type 2 Diabetes
Glycemic Control
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Rees, Jordan L
Supervisor and department
Dr. Normand Boule, Faculty of Physical Education and Recreation
Examining committee member and department
Dr. Jane Yardley, Faculty of Physical Education and Recreation
Dr. Rhonda Bell, Department of Agricultural, Food and Nutritional Science - Division of Human Nutrition
Dr. Carla Prado, Department of Agricultural, Food and Nutritional Science - Division of Human Nutrition
Department
Physical Education and Recreation
Specialization

Date accepted
2017-09-21T15:25:40Z
Graduation date
2017-11:Fall 2017
Degree
Master of Science
Degree level
Master's
Abstract
Background/Objective. Continuous glucose monitors (CGM) allow researchers to examine various aspects of circulating glucose profiles in response to exercise. Exercise studies using CGM in individuals with type 2 diabetes (T2D) vary in regards to the type and timing of exercise, making it difficult to compare inter-individual differences to the same bout of exercise. Furthermore, the majority of acute exercise studies have been conducted in males making it difficult to examine sex specific differences. As a consequence of these challenges, the Exercise-Physical Activity and Diabetes Glucose Monitoring (E-PAraDiGM) Protocol has been proposed and implemented across eight sites in Canada to provide a standardized comparison in prospective exercise studies using CGM. Results from this thesis form the preliminary analysis of the E-PAraDiGM protocol with data collection from the University of Alberta sites. Methods. Twenty participants diagnosed with T2D wore a CGM during the 6-day protocol and standardized meals were provided for 2 conditions (exercise vs. seated control) lasting 2 days each. Conditions were separated by a 72-hour washout period and their order was assigned according to a randomized crossover design. Exercise involved a 50-minute walk at 5.0 km/hr and 0.5% incline (~3.5 metabolic equivalents [METs]) performed 3 – 5 hours after lunch and prior to the evening meal. The 24-hour period following exercise was analyzed and compared to the control condition in which exercise was replaced by a time-matched 50-minute seated control condition. Results. Twenty participants (11 males, 9 females) were recruited and completed the protocol. The meanstandard deviation (SD) for age, time since diagnosis of T2D, and glycated hemoglobin (A1c) were 61.9 9.1 years, 9.3 6.9 years, and 6.8% 0.7%, respectively. On average, exercise did not affect 24-hour mean glucose (exercise 7.0 1.6, control 7.2 1.5, p=0.343) with the difference between the exercise and control conditions ranging from -1.7 mmol/L to +2.0 mmol/L. There was no difference between sexes (p=0.265), and no sex by exercise interaction in 24-hour mean glucose (p=0.300). There was a difference in 50-minute mean glucose during the exercise and seated control conditions (exercise 6.4 1.5 control 7.3 1.6 p<0.0001) and between sexes (males 7.0 1.5 , females 5.6 1.0, p<0.0001). No differences were found between the exercise and seated control conditions or between sexes in time spent above 10 mmol/L or below 4 mmol/L, postprandial glucose, fasting glucose, or glycemic variability. Conclusion. This was the first study to examine sex differences following an acute bout of exercise. Interestingly and contrary to previous findings, there was no effect of exercise on 24-hour mean glucose. Females had lower glucose levels during 50-minutes of exercise compared to males, but no differences were found in other outcome variables. Future analysis using the full E-PAraDiGM sample size will allow for further investigation of sex specific differences. Moreover, the examination of additional predictors of the glycemic responses (e.g. age, medication use, and body composition) to exercise will be examined.
Language
English
DOI
doi:10.7939/R3TQ5RT66
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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