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Purpose: This study aimed to investigate whether the use of a massage chair equipped with Golf Mode, specifically developed for golfers, has a positive effect on golfers’ swing performance and physiological changes in the lumbar muscles. Methods: In total, 20 golfers (age: 51.47±14.09 years) with experience ranging from 1 to 40 years participated in this study. Golfers received a 20-min intervention with a massage chair equipped with the Golf Mode, both before and after which their golf swing performance was assessed using a screen golf device. Additionally, muscle contraction thickness during the address posture was observed using wireless ultrasound equipment. After completing all the measurements, the participants were surveyed regarding their satisfaction with the Golf Mode. Results: The findings of this study demonstrated significant improvements in four of 11 golf swing performance-related metrics: total distance (P<.01), carry distance (P<.01), ball speed (P=.01), and club head speed (P=0.03). Additionally, there was a significant decrease in muscle thickness during the address posture, indicating physiological changes in muscle flexibility. The study also revealed high levels of satisfaction among the players with their golf performance after the Golf-Mode massage (score: 4.26±0.56 out of 5). Conclusion: The results of this study indicate that a massage chair equipped with the Golf Mode is effective in improving golf swing distance and has a positive impact on the psychological well-being of players.