7 lines (6 with data), 248 Bytes

m055a 0 128 0 11:06:00 17/05/1991
# Start time=11:06
# First beat=11:11:04.437
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.515,  <RR-high-limit(sec)>: 1.007
# Note: reel-to-reel recording, not flutter-compensated