Triplett's competition studies
1. Compared times across 3 races: races against other riders, races against time using a pacemaker and races against time alone
2. Using a pacemaker and racing alone 23% improvement, using a pacemaker racing with others 26% improvement
3. Physical theory: The pacing cyclist provides shelter from the wind, or suction that pulls the rider's bike along
4. Psychological theory: The presence of a friend provides encouragement, or takes away the need to worry about pacing oneself
5. Mystical theory: The wheel of the pacing machine has a hypnotic effect on the rider