NCT04742530

Fasted Evening Exercise: Performance and Compensatory Eating

Effects of Extended Fasting Prior to Evening Exercise on Appetite, Energy Intake and Performance.

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 16 (actual)
• Sponsor: Nottingham Trent University · Academic / Other
• Sex: All
• Age: 18 Years – 40 Years
• Healthy volunteers: Accepted

Summary

This study will compare the appetite, energy intake, and exercise performance responses to a bout of exercise completed in the evening after an extended period of fasting with a similar bout of exercise completed in the evening and the morning, after consuming a carbohydrate-containing meal.

Detailed description

Regular exercise is known to be a successful strategy for improving several facets of health and maintaining body weight. However, many people are not engaging in enough exercise, and some may not be achieving maximum benefits from the exercise that they already do. Performing exercise in the overnight fasted state has been shown to reduce energy intake over the course of a single day, without any compensatory reductions in free-living energy expenditure. Despite these promising findings, it is likely that not every member of the population is logistically able to perform exercise in the morning due to various work, family and social commitments, and exercise in the evening may be a logical alternative for these individuals. Whether the beneficial effects of overnight fasted exercise can be observed at an alternative time of the day (i.e. the evening) is unknown. Therefore, the investigators are interested in examining the compensatory appetite and energy intake responses following a bout of evening exercise performed after an extended (7 hour) period of fasting. Exercise performance will also be assessed as a marker of voluntary energy expenditure, which if reduced, has the potential to compensate for the reduced energy balance induced by fasted exercise.

Conditions

• Obesity

Interventions

Type	Name	Description
BEHAVIORAL	Fasted Evening Exercise	A 45 minute exercise session will take place on a stationary cycle ergometer at 18:30, after a 7-hour period of fasting. This will consist of 30 minutes of steady state cycling at 60% of VO2max, followed by an exercise test during which participants will complete as much work as they can within 15 minutes.
BEHAVIORAL	Fed Evening Exercise	A 45 minute exercise session will take place on a stationary cycle ergometer at 18:30, after having consumed a carbohydrate-containing meal (20% estimated energy requirements) 2 hours prior. This will consist of 30 minutes of steady state cycling at 60% of VO2max, followed by an exercise test during which participants will complete as much work as they can within 15 minutes.
BEHAVIORAL	Fed Morning Exercise	A 45 minute exercise session will take place on a stationary cycle ergometer at 10:30, after having consumed a carbohydrate-containing meal (20% estimated energy requirements) 2 hours prior. This will consist of 30 minutes of steady state cycling at 60% of VO2max, followed by an exercise test during which participants will complete as much work as they can within 15 minutes.

Timeline

• Start date: 2021-02-08
• Primary completion: 2021-06-23
• Completion: 2021-06-23
• First posted: 2021-02-08
• Last updated: 2021-08-05

Locations

2 sites across 1 country: United Kingdom