7 lines (6 with data), 248 Bytes

f125a 0 128 0 15:08:00 03/07/1987
# Start time=15:08
# First beat=15:13:46.453
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.437,  <RR-high-limit(sec)>: 1.257
# Note: reel-to-reel recording, not flutter-compensated