7 lines (6 with data), 248 Bytes

m056a 0 128 0 10:19:00 19/04/1990
# Start time=10:19
# First beat=10:40:12.687
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.492,  <RR-high-limit(sec)>: 1.195
# Note: reel-to-reel recording, not flutter-compensated