9 lines (8 with data), 409 Bytes

m035a 0 125.44 0 12:50:00 16/06/1988
# Start time=12:50
# First beat=12:51:49.515
# <age-range>: 75-79, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.601,  <RR-high-limit(sec)>: 1.156
# Note: reel-to-reel recording, not flutter-compensated;
#       time rescaled to fit the recording speed (1.47mm/s) from the scanning
#       speed (1.50mm/s) (i.e., sampling-rate adjusted to 125.44Hz from 128Hz)