None listed
Conditions
Brief summary
High amylose resistant starch hydration solutions have been found to improve hydration in clinical populations suffering from dehydrating conditions, such as cholera. The high amylose resistant starch solution is now the preferred oral rehydration therapy used by the World Health Organisation in developing countries. Due to its' hydrating properties, it has been suggested that this formulation may be of benefit to athletes. Unlike other oral sports oral rehydration solutions, the new high amylose resistant starch solution is consumed in 6-8 hours prior to exercise participation. This solution promotes water absorption in the large intestine by creating short chain fatty acids which are the product of the fermentation of resistant starches. Therefore, The aim of this study is to assess the effects of a high amylose resistant starch sports-hydration solution on hydration status and exercise performance in a hot and humid environment. We will do this by having participants cycle in a hot and humid environment for two hours at a power output of equal to 50% of maximal oxygen uptake before completing an all out 10-minute time trial.
Interventions
All participants will consume a high amylose maize starch (HAMS) sports-hydration solution (350mL, containing 33g of resistant starch) six hours prior to completing an exercise trial. The exercise trial will include two sub-maximal cycling bouts of one hour at a power output equal to 50% of maximal oxygen uptake, followed by a maximal 10-minute time trial. Participants will then be allowed to rest for 90 minutes. A second HAMS sports-hydration solution (350mL, containing 16.27g of resistant star
All participants will consume a high amylose maize starch (HAMS) sports-hydration solution (350mL, containing 33g of resistant starch) six hours prior to completing an exercise trial. The exercise trial will include two sub-maximal cycling bouts of one hour at a power output equal to 50% of maximal oxygen uptake, followed by a maximal 10-minute time trial. Participants will then be allowed to rest for 90 minutes. A second HAMS sports-hydration solution (350mL, containing 16.27g of resistant starch) will be consumed at the start of the rest period. All testing will be completed within an environmental chamber set at 30 degrees Celsius with a relative humidity of 50%. Participants will undergo a wash out period of at least 7 days before returning for the control trial. Participants will record consumption of all food and drinks on the day of the trial and will return empty containers.
Sponsors
University of South Australia
Study design
Allocation
Randomised controlled trial
Intervention model
Crossover
Primary purpose
Treatment
Masking
Blinded (masking used) (Subject)
Eligibility
Sex/Gender
All
Age
18 Years to 55 Years
Healthy volunteers
Yes
Inclusion criteria
- Male and female aged between 18 and 55 years. - Non-smoker (minimum 6 months). - Must complete at least 150 minute of vigorous cycling per week. - Must meet or exceed a relative maximal oxygen uptake of 55ml/kg/min for males and 45ml/kg/min for females.
Exclusion criteria
- Answered yes to any question in stage 1 of the Exercise and Sport Science Australia, Fitness Australia, Sports Medicine Australia and Exercise is Medicine's "Adult Pre-Exercise Screening System". - Resting blood pressure above 140/90 mmhg. - Have a cardiovascular or metabolic condition that imposes a health risk during exercise. - Regular use any medication or supplements that may alter heart rate or exercise performance. - Are unwilling to provide urine or have blood samples taken. - Are unwilling to unable to provide written consent. - Have gastrointestinal issues.
Outcome results
None listed