Effects of Pre-Exercise Nutrition Strategies on Body Temperature and Thermoregulatory Responses

Not Applicable

Completed

• Conditions: Impaired Thermoregulation
• Interventions: Other: Carbohydrate Beverage; Other: Placebo Beverage

• Registration Number: NCT02814188
• Lead Sponsor: Old Dominion University

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.

Detailed Description

Not available

Study Timeline

• Study Start: 2016-06
• Study First Submitted: 2016-06-20
• Study First Submitted QC: 2016-06-22
• Study First Posted: 2016-06-27
• Primary Completion: 2017-09
• Study Completion: 2017-09
• Status Verified: 2017-12
• Last Update Submitted: 2017-12-13
• Last Update Posted: 2017-12-15

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 37

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

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Carbohydrate Beverage	Carbohydrate Beverage	-
Placebo Beverage	Placebo Beverage	-

Primary Outcome Measures

Name	Time	Method
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 Outcome Measures

Name	Time	Method
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.
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.

Trial Locations

Locations (1)

Human Performance Laboratory; 🇺🇸 Norfolk, Virginia, United States