Chomsahai, S., Saisaeng, P., Thaisanguanvorakul, S., Chomsahai, P. and Ownsungnern, A. 2024. FACTORS TO PARTICIPATE VOLUNTARILY IN THE FIFTH NATIONAL SENIOR SPORTS COMPETITION OF SENIOR ATHLETES IN CHIANG MAI PROVINCE. Academic Journal of Thailand National Sports University. 16, 3 (Sep. 2024), 271–280.