The density of the bentonite particles. calculated from these data is 2.457 _+ 4 x 10 -7 g/cm 3. and the compressibility is 0.12 x 10 -12 _+ 2 x 10 -20. cmZ/dyne. The +_ values are asymptotic standard errors.
The bottom line is this: You burn fat and build cardiovascular fitness at both low and high exercise intensities. The logic is that at lower heart rates you burn more fat. At higher heart rates you supposedly burn less fat but get a better cardio workout. This is partly true, but let's take a closer look. For a 20 minute workout performed at a lower heart rate, you burn proportionally more fat as a fuel source, but fewer overall calories per unit of time.
Reaching your target heart rate â which is calculated based on your age, gender and resting heart rate â allows you to burn off calories without putting yourself at risk of an injury. And raising your heart rate isn't as hard as you might think. The minute we roll out of bed in the morning, our hearts begin to respond. As we start to move, the muscles call on the heart to deliver oxygen, explains Bob Karch, an exercise researcher at American University. As this happens, the heart rate increases. Karch straps on a heart-rate monitor and shows how quickly the heartbeat moves into a target zone for cardiovascular fitness: I've been racing around all morning from meeting to meeting, Karch says. And he's had a few cups of coffee, which can speed up the beat, too.