7 lines (6 with data), 251 Bytes

m009a 0 128 0 8:30:00 23/10/1990
# Start time=08:30
# First beat=08:42:19.132
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.562,  <RR-high-limit(sec)>: 1.031
# Note: recording with a timing signal, flutter-compensated