7 lines (6 with data), 246 Bytes

m088a 0 128 0 2:35:00 14/07/1989
# Start time=02:35
# First beat=02:39:41.671
# <age-range>: 50-54, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.601,  <RR-high-limit(sec)>: 1.32
# Note: reel-to-reel recording, not flutter-compensated