7 lines (6 with data), 247 Bytes

m063a 0 128 0 11:10:00 05/02/1990
# Start time=11:10
# First beat=11:12:41.234
# <age-range>: 35-39, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.554,  <RR-high-limit(sec)>: 0.96
# Note: reel-to-reel recording, not flutter-compensated