n.v.t. dehydration. Heat illness
Conditions
Interventions
A three hour march (3 times a 50 minute walk followed by a 10 minute break)
will be performed in a climate chamber set at 33°C with 50% relative humidity.
Each session involves consuming one of the
Sponsors
TNO
Eligibility
Age
18 Years to 64 Years
Inclusion criteria
Inclusion criteria: A healthy adult male (18-40 years old) who is physically active (at least 2 times per week), and who is able to walk for at least three hours.
Exclusion criteria
Exclusion criteria: • A thermoregulation disorder or a history of heat illness. • A physical injury that makes the protocol unfeasible. • A history of- or currently experiencing bowel issues • Use of medication for cardiovascular conditions, diabetes, and/or medications that affect thermoregulation. • Staying abroad (>25 °C) in the past four weeks (to exclude heat-acclimatized participants).
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The main study parameter is the difference in core temperature between the following three conditions: isotone sports drink at 33°C (room temperature), slush puppy at 0°C and slush puppy combined with glycerol at 0°. | — |
Secondary
| Measure | Time frame |
|---|---|
| Secondary study parameters include differences in urine production, heart rate, sweat production and concentration, blood plasma volume, skin temperature, peak power and cognitive performance between the conditions. Additionally, several questionnaires will be conducted during the march to assess differences in rate of perceived exertion, thermal sensation, thermal comfort, thirst perception and possible side effects experienced across the conditions. | — |
Countries
Netherlands
Outcome results
None listed