My big purchase this Fall (actually an early birthday gift from my wife) was a Garmin GPS watch with a wireless heart-rate monitor. I've read (and wondered) about these for a number of years--and in my desire to get the most out of each workout I treated myself with an early birthday present. I justified it by allocating a portion of my stipend for coaching the South Cross-Country Running team.
So far, so good... with one exception... according to the watch, during last nights run, my heart-rate was recorded at 160bpm at minute 1:46 and had spiked to over 180bpm at the first four minute mark. The dip shortly thereafter was me stepping off the treadmill to check my pulse manually--it seemed fine. I got back on the machine, slowed the pace and kept going. Finally, after 9 minutes into the workout, my heart-rate measured a more accurate 121bpm.
I'm attributing this anomaly (its happened to some degree the last five times out) to the chest strap. Before the nine-minute mark I'm not perspiring to any degree and the sensors on the pad may not be reading my pulse as accurately as it could. Tonight I plan to "spin" for 45 minutes and will be sure to pre-moisten the sensors prior to beginning.
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