A Study to See if an Energy Drink With Caffeine and Green Tea Increases Fat Burning When Exercising

This study investigates whether consuming an energy drink containing caffeine and green tea extract before exercise increases fat burning (oxidation) compared with a placebo drink. Healthy, moderately active adults will attend three visits at clinic over 3-5 weeks. The first visit determines each participant's individual exercise intensity that maximises fat use during cycling. At two subsequent visits, participants will consume either the active drink or a placebo before completing a 30-minute cycling session at their personalised intensity. Fat and carbohydrate use, heart rate, blood pressure, and subjective responses will be measured at rest, during exercise, and after exercise using a double-blind, crossover design.

Inclusion criteria

• Passing the Exercise and Sport Science Australia adult pre-exercise screening system (APSS) stage 1 & 2 (see appendix 4).
• Between the ages of 18 and 45,
• Not sedentary, and not completing more than 150 minutes of low and/or moderate and/or or vigorous intensity endurance exercise a week,
• Ability to commit to in principle fulfilment of all 3 trial visits,
• No history of coagulopathy e.g., DVT, stroke,
• No known heart disease,
• No known pancreatic insufficiency,
• No known inflammatory bowel disease, or prior bowel resection or bypass surgery (excluding gastric banding and sleeve),
• BMI of 22.0 to 34.9 kg/m2,
• No known allergies to caffeine or green tea extract,
• No known type I or II diabetes,
• No uncontrolled concurrent illness,
• No known current pregnancy or breastfeeding women
• No current regular consumption of supplements (>2 times a week) or foods and drinks containing caffeine and/or green tea extracts (>2 times per day, weekly).
• Agree not to consume caffeine for 12-hours prior to the clinic visit.

Exclusion criteria

• Triggering any of the exclusion screening criteria as outlined below, and in compliment with the Exercise and Sport Science Australia adult pre-exercise screening system (APSS).
• Under the age of 18 or over the age of 45,
• Sedentary, or completing over 150 minutes of low and/or moderate and/or or vigorous intensity endurance exercise a week,
• Inability to commit to in principle fulfilment of all 3 trial visits,
• History of coagulopathy e.g., DVT, stroke,
• Known heart disease,
• Known pancreatic insufficiency,
• Known inflammatory bowel disease, or prior bowel resection or bypass surgery (excluding gastric banding and sleeve),
• BMI < 22.0 or > 34.9 kg/m2,
• Known allergies to caffeine or green tea extract,
• Known type I or II diabetes,
• Uncontrolled concurrent illness,
• Taking GLP-1 agonists, caffeine, or any other medication known to affect metabolism.
• Known current pregnancy or breastfeeding women.
• Currently regularly consuming supplements, foods or drinks containing a caffeine and green tea extract blend, or not willing to abstain for the study