7 lines (6 with data), 252 Bytes

m037a 0 128 0 10:40:00 28/11/1990
# Start time=10:40
# First beat=10:40:00.250
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.429,  <RR-high-limit(sec)>: 1.078
# Note: recording with a timing signal, flutter-compensated