Dr. Glenda Courtney-Martin, PhD
Claim this profileThe Hospital For Sick Children
Studies Healthy Subjects
Studies Aging
5 reported clinical trials
4 drugs studied
Affiliated Hospitals
Clinical Trials Glenda Courtney-Martin, PhD is currently running
Threonine
for Aging
Threonine is an essential amino acid and must be obtained from the diet. The body's capacity to maintain adequate mucin synthesis is directly related to the bioavailability of certain amino acids, including threonine, serine and proline (1). Moreover, the rate of mucin synthesis has been demonstrated to be directly related to the availability of dietary threonine in healthy rats (2) and piglets (3,4). Intestinal inflammation is known to increase gastrointestinal threonine uptake and mucin synthesis in enterally fed minipigs (5). Additionally, in animals, mucin function/barrier has been shown to decline with age, leaving them more susceptible to bacterial penetration. Thus, with advancing age (6), a higher dietary supply of threonine may be needed for maintaining intestinal mucosal health. Despite this, the current threonine requirement is based on studies conducted exclusively in young adults. Thus, there is a need to determine the threonine requirement directly in older adults.
Recruiting1 award N/A
Dietary Intakes
for Crohn's Disease
The goal of the current study is to measure the requirement for threonine in patients with CD using the IAAO method and compare the requirement to previously determined threonine requirement estimated in young adults using the IAAO technique. It is hypothesize that the requirement for threonine in patients with CD will be higher than the threonine requirement previously determined in young adults using the IAAO method. Up to 10 clinically stable patients with CD will be recruited from the IBD Clinic at Mt. Sinai Hospital, Toronto, and subsequently followed up at the Clinical Research Center (CRC), The Hospital for Sick Children (SickKids), Toronto, Canada. Before the study begins, the participants will be required to visit the CRC (Room 5500 Hill Wing, The Hospital for Sick Children) for a pre-study assessment of their height, weight, fat mass, fat free mass, resting metabolic rate and medical history. These assessments will take about 3 hours to complete. They will need to have been fasted for 10 hours prior to the pre-study assessment. The pre-study assessment is needed to calculate their dietary requirements for the study, and to assess health status. After signing the consent form, the subjects will complete the screening procedures (height, weight, fasting blood sample and medical history questionnaire, BIA, Skinfold and calorimetry). Each study will consist of a 2-day adaptation period to a prescribed diet in accordance with the energy requirement of the subject and 1-study day. The diet will provide an adequate amount of protein, of 1 g protein/kg/d. The 2-day adaptation period is to allow the body to adapt to an adequate amount of protein as it has been shown that protein kinetics is altered without it. Dietary intakes during this time will be provided in the form of lactose-free milk shakes (Scandishake) with added carbohydrate (SolCarb) and protein (beneprotein) to meet the subjects' requirement. Following the 2 days of adaptation is the study day where threonine intake will be randomly assigned and phenylalanine (Phe) kinetics will be measured with the use of isotopically labelled Phe. On this day, VCO2 will be measured by calorimetry immediately after the 5th meal for a period of 20 minutes. On the study day (3rd day of each 3-day period), the diet will be provided as 8 hourly isocaloric, isonitrogenous meals made up of a flavored liquid formula and protein free cookies developed for use in amino acid kinetic studies. Each meal will represent 1/12th of the subject's total daily requirements. The nitrogen (protein) content of the diet will be provided in the form of a crystalline amino acid mixture based on the amino acid composition of egg protein. * A daily multivitamin supplement will be provided during the study period. * No other food or beverages will be consumed on the adaptation days except water, 1 cup clear tea, or 1 cup clear coffee. * During the 8-hr study day, no other food or drink will be consumed except water. * Urine and breath samples will be collected at baseline and at isotopic steady state. * Breath samples will be collected simultaneously with urine samples. * Five baseline breath samples will be collected 60, 45, 30, 15 min, and just before the tracer protocol begins. * Three baseline urine samples will be collected 60, 30 min, and just before the tracer protocol begins. * Four plateau breath samples will be collected every 15 minutes 2.5 h after the tracer protocol begins. * Three plateau breath samples will be collected every 30 minutes 2.5 h after the tracer protocol begin * Breath samples will be collected with subjects breathing into an Exetainers plastic tube and samples will be stored in pre-evacuated glass tubes at room temperature until analysis. * Urine samples will be collected in Eppendorf tubes and stored at - 20 º C until analyzed for 1-13C phenylalanine enrichment. * The rate of CO2 production (VCO2) will be measured on each testing day using a ventilated hood indirect calorimeter at meal 5 to quantify 13CO2 excretion in breath. Subjects can choose to withdraw from the study at any time and for any reason, based on his/her individual judgment. In particular, if a subject is unable to tolerate the diet, whether it is regards to taste, loose stools or constipated stools, he/she has the right to withdraw at any time during the study.
Recruiting1 award N/A7 criteria
More about Glenda Courtney-Martin, PhD
Clinical Trial Related1 year of experience running clinical trials · Led 5 trials as a Principal Investigator · 4 Active Clinical TrialsTreatments Glenda Courtney-Martin, PhD has experience with
- Threonine
- Tryptophan
- Dietary Intakes
- Barley
Breakdown of trials Glenda Courtney-Martin, PhD has run
Healthy Subjects
Aging
Healthy Aging
Crohn's Disease
Inflammatory Bowel Disease
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Frequently asked questions
Do I need insurance to participate in a trial?
Almost all clinical trials will cover the cost of the ‘trial drug’ — so no insurance is required for this. For trials where this trial drug is given alongside an already-approved medication, there may be a cost (which your insurance would normally cover).
What does Glenda Courtney-Martin, PhD specialize in?
Glenda Courtney-Martin, PhD focuses on Healthy Subjects and Aging. In particular, much of their work with Healthy Subjects has involved treating patients, or patients who are undergoing treatment.
Is Glenda Courtney-Martin, PhD currently recruiting for clinical trials?
Yes, Glenda Courtney-Martin, PhD is currently recruiting for 4 clinical trials in Toronto Ontario. If you're interested in participating, you should apply.
Are there any treatments that Glenda Courtney-Martin, PhD has studied deeply?
Yes, Glenda Courtney-Martin, PhD has studied treatments such as Threonine, Tryptophan, Dietary Intakes.
What is the best way to schedule an appointment with Glenda Courtney-Martin, PhD?
Apply for one of the trials that Glenda Courtney-Martin, PhD is conducting.
What is the office address of Glenda Courtney-Martin, PhD?
The office of Glenda Courtney-Martin, PhD is located at: The Hospital For Sick Children, Toronto, Ontario M5G1X8 Canada. This is the address for their practice at the The Hospital For Sick Children.
Is there any support for travel costs?
The coverage of travel expenses can vary greatly between different clinical trials. Please see more financial detail in the trials you’re interested to apply.