โพธิ์ผำใหญ่ เ., กุลโสภิต ส. and นาคอ้าย น. 2017. EFFECTED OF LESS OXYGEN AND HOLD BREATHING TRAINING PROGRAM ON 50 METERS SPEED FREESTYLE OF YOUTH SWIMMER, CHIANG MAI PROVINCE. Ganesha Journal. 13, 2 (Dec. 2017), 53–63.