Your heart rate can change due to a number of things including even breathing a certian speed, people who exercise has a slower heart beat then someone who doesnt exercise.
Or even if something is wrong with your heart, your heart rate can change too.
Tricyclic antidepressant (TCAs) class is most closely linked with anticholinergic side effects.
Amitriptyline, amoxapine, clomipramine and protriptyline are Tricyclic antidepressants (TCAs) that are used to treat chronic pain. Amitriptyline and nortriptyline among these medications provide the most reassuring safety information during pregnancy and breastfeeding.
In vitro and in vivo, TCAs are powerful inhibitors of norepinephrine and/or serotonin reuptake. In addition, several TCAs are known to block sodium, calcium, alpha-1 adrenoceptors, histamine (H1) receptors, and muscarinic cholinergic receptors. Thought to be responsible for their unfavourable anticholinergic, antihistaminergic, and cardiotoxic side effects rather than their antidepressant effects, these neurotransmitter receptor actions.
Learn more about TCAs here;
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If I'm correct your answer for skills would be agility, co-ordination, speed and I don't know about any others. For health it would be muscle strength and endurance, flexibility, and body composition. The reason for this would be that in water Aerobics, your body is constantly moving with high impact movements. These movements will begin to speed up the more you practice and your agility will go up. Working with others during this would add co-ordination with one another. The water is putting pressure around your body and with these movements, your muscles would begin to tear and strengthen, along with as long as you can preform these movements, it would be adding muscle endurance as well. The flexibility is from it loosening your joints. Body composition will begin to change as well, meaning you may lose quite a bit of weight during this due to it burning a lot of calories.