Impaired Thermoregulation
Conditions
Keywords
Exercise
Brief summary
Carbohydrate ingestion, in particular fructose, has been shown in a handful of previous studies to elicit a thermic effect and increase core body temperature after ingestion. Carbohydrate foods and supplements are commonly consumed prior to endurance running competition, including situations where an athlete's ability to dissipate body heat is compromised. Thus, there is some potential for pre-exercise carbohydrate ingestion to have a deleterious effect on body heat regulation in hot and humid environments. Thus, this projects aims to study the effects of pre-exercise carbohydrate ingestion on core body temperature, perceived thermal stress, and perceived exertion during high-intensity running.
Interventions
750 ml of a 13.5% carbohydrate (sucrose) beverage
OTHERPlacebo Beverage
750 ml of an artificially-sweetened beverage
Sponsors
Old Dominion University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
DOUBLE (Subject, Investigator)
Eligibility
Sex/Gender
ALL
Age
18 Years to 65 Years
Healthy volunteers
Yes
Inclusion criteria
* Be currently running ≥20 miles per week * Have a projected 5-km maximal effort running time between 16:00-23:00 minutes
Exclusion criteria
* Any gastrointestinal disorders that cause swallowing problems or frequent nausea/vomiting
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Core Body Temperature | 80 minutes (60, 50, 40, 30, 20, and 10 min pre-run and at 1-km intervals during a 20 min 5-km run) | Core body temperature will be measured with a ingestible pill thermometer. Readings will be taken during a 60 minute rest period and at 1-km intervals during a 5-km run. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Thermal Sensation Scale | 80 minutes (60, 50, 40, 30, 20, and 10 min pre-run and at 1-km intervals during a 20 min 5-km run) | The Thermal Sensation Scale is a 0-8 numerical rating scale with descriptors of unbearably cold at 0, neutral at 4, and unbearably hot at 8. These ratings will be collected during a 60 minute rest period and at 1-km intervals during a 5-km run. |
| Feeling Scale | 80 minutes (60, 50, 40, 30, 20, and 10 min pre-run and at 1-km intervals during a 20 min 5-km run) | The Feeling Scale is a bipolar numerical rating scale ranging from -5 to +5, with descriptors of very bad at -5, neutral at 0, and very good at +5. These ratings will be collected during a 60 minute rest period and at 1-km intervals during a 5-km run. |
| Rating of Perceived Exertion | 80 minutes (60, 50, 40, 30, 20, and 10 min pre-run and at 1-km intervals during a 20 min 5-km run) | These ratings will be collected during a 60 minute rest period and at 1-km intervals during a 5-km run. |
Countries
United States
Outcome results
None listed