7 lines (6 with data), 248 Bytes

m135a 0 128 0 13:00:00 28/09/1989
# Start time=13:00
# First beat=13:43:36.351
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.515,  <RR-high-limit(sec)>: 1.132
# Note: reel-to-reel recording, not flutter-compensated