True Fitness Z9 - Manual (Page 82)

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Because CHR is already trying to detect a fainter signal compared
to a chest strap, it takes less of a vertical heart position to cause it to
stop working. Depending on the CHR system, somewhere between
3% and 5% of the population cannot be picked up by any contact
heart rate monitoring system.
This heart-in-the-chest-cavity position is by far the leading cause of
CHR performance variation among individuals. Other factors which
negatively affect CHR performance are:
1. Dry or dirty hands.
2. Lotion or moisturizer on hands.
3. Excessive upper body motion, such as when using cross-trainer
ellipticals and in running.
4. Excessively tight grip.
5. Erratic or labored breathing or excessive talking.
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Z 8 a n d Z 9 S e r i e s Tr e a d m i l l O w n e r ' s G u i d e