A new study suggests that treating obstructive sleep apnea (OSA) with continuous positive airway pressure (CPAP) therapy improves golf performance in middle-aged men. Results show that up to six months of treatment with CPAP therapy was associated with significant improvements in self-reported excessive daytime sleepiness and sleep-related quality of life. Participants treated with CPAP therapy also experienced a significant drop of 11 percent in their average handicap index, a standardized formula that estimates a golfer's skill level. Among the more skilled golfers who had a baseline handicap index of 12 or less, the average handicap index dropped by 31.5 percent. Participants attributed their enhanced performance to factors such as improved concentration, endurance and decision making.