7 lines (6 with data), 248 Bytes

m286a 0 128 0 15:30:00 13/08/1990
# Start time=15:30
# First beat=15:50:21.109
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.507,  <RR-high-limit(sec)>: 1.078
# Note: reel-to-reel recording, not flutter-compensated