None listed
Conditions
Brief summary
The critical environmental thresholds that constitute the level of risk (i.e. low, moderate, high, extreme) for heat illness in popular extreme heat policies for long-distance running do not differentiate between distance categories (i.e. 5 km, 10 km, half marathon, marathon). The project aims to observe the physiological response of individuals competing across a 5 km, 10 km, and half marathon in a crossover study design. This will inform the evolution of these policies by contributing data to help decision makers determine if the environmental thresholds that determine risk should be adjusted across the various distances. We hypothesise that the difference in the core temperature response between the 5 km and 10 km trials, and the 5 km and 21.1 km trials will be statistically different.
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 to 4 hours and are undertaken 3-7 days apart.
-The familiarisation session will occur 3-7 days prior to the first experimental session and take approximately 3 hours and requires participants t
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 to 4 hours and are undertaken 3-7 days apart. -The familiarisation session will occur 3-7 days prior to the first experimental session and take approximately 3 hours and requires participants to complete an incremental test to exhaustion and a 5 km time trial on the treadmill. The incremental test to exhaustion will be conducted in temperate conditions (22°C and 50% relative humidity) 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 running self-paced time trial on a treadmill across three distances (one per session) in warm and humid conditions (28.5°C and 76 % relative humidity); - 5 km - 10 km - Half marathon Running economy will be assessed before and after each time-trial. 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 5 km, 10 km and 21.1 km were chosen as these are sanctioned World Athletics distances and are popular community-run distances 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 Mile End campus of Adelaide University.
Sponsors
Adelaide University
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