7 lines (6 with data), 252 Bytes

m030a 0 128 0 14:45:00 22/10/1990
# Start time=14:45
# First beat=14:46:04.671
# <age-range>: 45-49, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.679,  <RR-high-limit(sec)>: 1.382
# Note: recording with a timing signal, flutter-compensated