7 lines (6 with data), 247 Bytes

m083a 0 128 0 15:26:00 22/10/1987
# Start time=15:26
# First beat=15:48:50.226
# <age-range>: 70-74, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.578,  <RR-high-limit(sec)>: 0.82
# Note: reel-to-reel recording, not flutter-compensated