Dr. Chris Wagstaff of the University of Portsmouth in the UK published interesting research in the Journal of Sport and Exercise Psychology concluding that athletes suppressing their emotions generated less power in a controlled test on a bike, had a lower heart rate, and afterwards, thought they had worked much harder than they actually did. Dr. Chris Wagstaff gives a brief rundown of his research in the video below. Also TeamLocals.co.uk spoke with Dr. Chris Wagstaff and gives a more detailed explanation of his research. Hopefully you can use it to apply to your riding.