7 lines (6 with data), 247 Bytes

m164a 0 128 0 13:00:00 10/11/1990
# Start time=13:00
# First beat=13:07:09.187
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.39,  <RR-high-limit(sec)>: 0.742
# Note: reel-to-reel recording, not flutter-compensated