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Holding your breath is bad. The main reason is your body needs oxygen to workout properly. As you hold your breath you build up your CO2 in your body which will cause you to fatigue faster. Some of my clients either like to count their reps which helps them breath or during your contraction of the muscle breath out and when you relax breath in. So breathing will help you last longer in your workouts.
This means that holding your breath might actually reduce your heart rate, as the relaxed muscles no longer need a lot of oxygen, and your CO2 levels are low. After holding your breath for a while though, oxygen will run low in your blood, CO2 will be increased, and once again the urge to breathe will be very large.