7 lines (6 with data), 249 Bytes

m282a 0 128 0 9:32:00 25/01/1991
# Start time=09:32
# First beat=09:37:23.937
# <age-range>: 65-69, <sex>: Female, <medication>: None
# <RR-low-limit(sec)>: 0.484,  <RR-high-limit(sec)>: 0.867
# Note: reel-to-reel recording, not flutter-compensated