The effect of acute voluntary exercise session on pain threshold and tolerance in middle-aged tennis players Journal title: Uluslararası Spor Egzersiz ve Antrenman Bilimi dergisi Authors: NURLAN HASANLI, SAMİ ALTUNTAŞ, MEHMET ZEKİ SARI, YAŞAR GÜL ÖZKAYA Subject(s): Physical Education, Physiology