Psychophysiological stress responses to competition golf were examined in three groups of players, professional trainee (PRO), recreational (REC) and elite amateur (AMA). The PRO and REC golfers, comprising a high and moderate ability group respectively, were additionally studied during a practice golf round. Competition stress was determined by comparing psychophysiological responses during competition to those in practice. Relationships between psychophysiological stress parameters and performance were also examined. In a further study, the AMA group underwent an eight week aerobic training program and their psychophysiological responses in a second competition round were compared to their pre-training levels.