7 lines (6 with data), 248 Bytes

m062a 0 128 0 10:00:00 25/04/1991
# Start time=10:00
# First beat=10:38:07.671
# <age-range>: 40-44, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.414,  <RR-high-limit(sec)>: 1.414
# Note: reel-to-reel recording, not flutter-compensated