7 lines (6 with data), 252 Bytes

m040a 0 128 0 10:35:00 24/10/1990
# Start time=10:35
# First beat=10:39:11.320
# <age-range>: 75-79, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.531,  <RR-high-limit(sec)>: 1.046
# Note: recording with a timing signal, flutter-compensated