Changes in cardiac rhythm in man during underwater submersion and swimming studied by ECG telemetry. - Yamaguchi,H.; Obara,S.; Tanabe,S.; Utsuyama,N.; Takahashi,A.; Nakahira,J.; Yamamoto,Y.; Jiang,Z-L.; He,J.; Bando,E.; Miyamoto,H. (Eur J Appl Physiol, 1993)