7 lines (6 with data), 248 Bytes

m236a 0 128 0 10:04:00 30/01/1989
# Start time=10:04
# First beat=10:08:05.304
# <age-range>: 40-44, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.453,  <RR-high-limit(sec)>: 1.062
# Note: reel-to-reel recording, not flutter-compensated