7 lines (6 with data), 246 Bytes

m064a 0 128 0 14:36:00 25/01/1990
# Start time=14:36
# First beat=14:36:00.585
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.5,  <RR-high-limit(sec)>: 1.023
# Note: reel-to-reel recording, not flutter-compensated