None listed
Conditions
Brief summary
A lack of validation data exists that compares the response of exercising individuals in different heat illness risk rating categories proposed by publicly available extreme heat policies for sport and exercise. The project aims to validate and inform publicly available extreme heat policies for long distance running by observing the heat strain of runners exercising in environmental conditions that are graded as moderate, high, and extreme environmental risk ratings according to the policies. We hypothesise that a progressively graded and higher response in thermoregulatory (core temperature), cardiovascular (heart rate), and perceptual measures (thermal discomfort) will be observed when moving from moderate to high to extreme risk environments. We also hypothesise that the extreme risk rating category will be associated with the participants approaching a core temperature response that is typically deemed as a 'cut-off' for exercise.
Interventions
Materials and procedures:
-Once enrolled into the study, participants will complete one familiarisation session and three experimental trials in an environmental chamber. Every session will involve only an individual participant completing the trials.
-Each experimental session will take approximately 2 hours and are undertaken 4-7 days apart.
-The familiarisation session will occur 4-7 days prior to the first experimental session take approximately 3 hours and requires participants to complete
Materials and procedures: -Once enrolled into the study, participants will complete one familiarisation session and three experimental trials in an environmental chamber. Every session will involve only an individual participant completing the trials. -Each experimental session will take approximately 2 hours and are undertaken 4-7 days apart. -The familiarisation session will occur 4-7 days prior to the first experimental session take approximately 3 hours and requires participants to complete an incremental test to exhaustion and a 10 km time trial on the treadmill. The incremental test to exhaustion will be conducted in temperate conditions (22°C and 50% RH) on a calibrated motorised treadmill at 1% incline with a metabolic cart to measure gas exchange. The test will consist of initial four minute submaximal steady state exercise intensities, followed by the speed of the treadmill increasing by 1 km/h every minute until volitional exhaustion. - The three experimental sessions require the participant to complete a 10 km running self-paced time trial on a treadmill in three environmental risk ratings (one per session); - RISKmoderate (30°C and 45% RH) - RISKhigh (28.5°C and 76% RH) - RISKextreme (32.5°C and 68% RH) The minimum period of days that the intervention can be completed over is 18 days. A study calendar will be used to manage adherence to the study sessions. The risk ratings are categorised according to publicly available extreme heat policies. Who will deliver: A sport science graduate will lead data collection, and the remainder of the team are experienced researchers with 10-30 years of academic experience. Mode: In-person testing of individual participants Location: Environmental chamber at the University of South Australia
Sponsors
University of South Australia
Study design
Allocation
Randomised controlled trial
Intervention model
Crossover
Primary purpose
Prevention
Masking
Open (masking not used)
Eligibility
Sex/Gender
All
Age
18 Years to 55 Years
Healthy volunteers
Yes
Inclusion criteria
Trained long-distance runners who are: males and females aged between 18-55 and are training at least three times per week with local level representation
Exclusion criteria
Not passing Stage 1 of the ESSA pre-exercise screening tool.
Outcome results
None listed