7 lines (6 with data), 252 Bytes

m044a 0 128 0 10:10:00 15/01/1990
# Start time=10:10
# First beat=10:21:52.828
# <age-range>: 70-74, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.515,  <RR-high-limit(sec)>: 1.304
# Note: recording with a timing signal, flutter-compensated