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This study had three aims:
Participants completed 14 days of exercise heat acclimation in either a hot or cool environment, followed by a heat or cool exercise exposure every 5th day for 25 days. Cardiovascular, thermoregulatory, and perceptual strain were measured throughout exercise each day. Hydration assessment and stress response via blood biomarkers were measured before and after exercise. Aerobic capacity was measured before and after heat acclimation as well as after the intermittent exercise-heat exposure. Hand cooling was implemented periodically during exercise-heat stress visits to determine cooling efficacy before and after heat acclimation.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Exercise in heat group | Experimental | Exercise in a hot environment |
|
| Exercise in cool group | Placebo Comparator | Exercise in a cool environment |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Heat acclimation | Other | 14 days of aerobic exercise in a hot environment |
| |
| Measure | Description | Time Frame |
|---|---|---|
| Internal Body Temperature | Rectal temperature was assessed five days following measurement at baseline. | 5 days |
| Measure | Description | Time Frame |
|---|---|---|
| Heart Rate | Heart rate was assessed five days following baseline. | 5 days |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Douglas J Casa, PhD | University of Connecticut | Principal Investigator |
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| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 33846088 | Derived | Pryor RR, Pryor JL, Vandermark LW, Adams EL, Brodeur RM, Armstrong LE, Lee EC, Maresh CM, Casa DJ. Short term heat acclimation reduces heat strain during a first, but not second, consecutive exercise-heat exposure. J Sci Med Sport. 2021 Aug;24(8):768-773. doi: 10.1016/j.jsams.2021.03.020. Epub 2021 Apr 6. |
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Aggregate data can be shared upon request.
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Participants were excluded if they did not reach the aerobic fitness criteria or if there were foreseen scheduling conflicts.
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| ID | Title | Description |
|---|---|---|
| FG000 | Exercise in Heat Group | Exercise in a hot environment Heat acclimation: 14 days of aerobic exercise in a hot environment |
| FG001 | Exercise in Cool Group | Exercise in a cool environment Exercise in a cool environment: 14 days of aerobic exercise in a cool environment |
| Title | Milestones | Reasons Not Completed | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
|
|
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| ID | Title | Description |
|---|---|---|
| BG000 | Exercise in Heat Group | Exercise in a hot environment Heat acclimation: 14 days of aerobic exercise in a hot environment |
| BG001 | Exercise in Cool Group | Exercise in a cool environment Exercise in a cool environment: 14 days of aerobic exercise in a cool environment |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Categorical | Count of Participants |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Internal Body Temperature | Rectal temperature was assessed five days following measurement at baseline. | Posted | Mean | Standard Deviation | degrees Celcius | 5 days |
|
8 months
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | Exercise in Heat Group | Exercise in a hot environment Heat acclimation: 14 days of aerobic exercise in a hot environment |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Dr. Riana Pryor | University at Buffalo | 7168295456 | rpryor@buffalo.edu |
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| ID | Term |
|---|---|
| D015444 | Exercise |
| ID | Term |
|---|---|
| D009043 | Motor Activity |
| D009068 | Movement |
| D009142 | Musculoskeletal Physiological Phenomena |
| D055687 | Musculoskeletal and Neural Physiological Phenomena |
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| Exercise in a cool environment |
| Other |
14 days of aerobic exercise in a cool environment |
|
| BG002 | Total | Total of all reporting groups |
| Participants |
|
| Sex: Female, Male | Count of Participants | Participants |
|
| Race (NIH/OMB) | Count of Participants | Participants |
|
| Region of Enrollment | Number | participants |
|
| VO2max | Mean | Standard Deviation | mL/kg/min |
|
| Units |
|---|
| Counts |
|---|
| Participants |
|
|
| Secondary | Heart Rate | Heart rate was assessed five days following baseline. | Posted | Mean | Standard Deviation | beats per minute | 5 days |
|
|
|
| 0 |
| 22 |
| 0 |
| 22 |
| 0 |
| 22 |
| EG001 | Exercise in Cool Group | Exercise in a cool environment Exercise in a cool environment: 14 days of aerobic exercise in a cool environment | 0 | 12 | 0 | 12 | 0 | 12 |
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