The fitness center at work was hosting an event dubbed the 4 x 6 relay. It was a 1.5 mile course with teams of 4. In the interest of time, it was a staggered start rather than a relay with a baton. The first runners started. 2 minutes later the second runners started, etc.
The course started downhill and then turned uphill before flattening out and then a short uphill at the finish. I was shooting for a 12:00 time, but was thrilled to finish in 11:14. However, my Garmin did measure the course at 1.43 miles.
There were some fast finisher including a couple of guys in the 9:30 range and a half dozen in the 10:00 to 10:30 range.
I looked at my heart rate during the event and noticed it spiking over 200 beats per minute. I am fairly certain that was an anomaly, although I do believe my finish line heart rate of 184.