7 lines (6 with data), 251 Bytes

m090a 0 128 0 9:35:00 27/02/1990
# Start time=09:35
# First beat=09:43:01.773
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.492,  <RR-high-limit(sec)>: 0.835
# Note: recording with a timing signal, flutter-compensated