7 lines (6 with data), 248 Bytes

m024a 0 128 0 11:43:00 15/10/1990
# Start time=11:43
# First beat=12:20:57.945
# <age-range>: 45-49, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.531,  <RR-high-limit(sec)>: 1.093
# Note: reel-to-reel recording, not flutter-compensated