7 lines (6 with data), 248 Bytes

m077a 0 128 0 14:46:00 14/06/1989
# Start time=14:46
# First beat=14:47:32.226
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.664,  <RR-high-limit(sec)>: 1.226
# Note: reel-to-reel recording, not flutter-compensated