7 lines (6 with data), 252 Bytes

m025a 0 128 0 10:50:00 30/03/1990
# Start time=10:50
# First beat=10:52:08.132
# <age-range>: 55-59, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.382,  <RR-high-limit(sec)>: 0.695
# Note: recording with a timing signal, flutter-compensated