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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Carbohydrate Beverage | Experimental |
| |
| Placebo Beverage | Placebo Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Carbohydrate Beverage | Other | 750 ml of a 13.5% carbohydrate (sucrose) beverage |
| |
| Measure | Description | Time Frame |
|---|---|---|
| Core Body Temperature | 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. | 80 minutes (60, 50, 40, 30, 20, and 10 min pre-run and at 1-km intervals during a 20 min 5-km run) |
| Measure | Description | Time Frame |
|---|---|---|
| Thermal Sensation Scale | 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. | 80 minutes (60, 50, 40, 30, 20, and 10 min pre-run and at 1-km intervals during a 20 min 5-km run) |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Human Performance Laboratory | Norfolk | Virginia | 23529 | United States |
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| ID | Term |
|---|---|
| D009043 | Motor Activity |
| ID | Term |
|---|---|
| D001519 | Behavior |
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| Placebo Beverage |
| Other |
750 ml of an artificially-sweetened beverage |
|
| Feeling Scale | 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. | 80 minutes (60, 50, 40, 30, 20, and 10 min pre-run and at 1-km intervals during a 20 min 5-km run) |
| Rating of Perceived Exertion | These ratings will be collected during a 60 minute rest period and at 1-km intervals during a 5-km run. | 80 minutes (60, 50, 40, 30, 20, and 10 min pre-run and at 1-km intervals during a 20 min 5-km run) |