7 lines (6 with data), 252 Bytes

m087a 0 128 0 10:39:00 28/08/1990
# Start time=10:39
# First beat=10:47:21.390
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.671,  <RR-high-limit(sec)>: 1.304
# Note: recording with a timing signal, flutter-compensated