Re: High pulse rate under little exertion.
Okay, this is a topic more appropriate under the general forum but I will provide a response.
Sedentary lifestyle produces a number of effects on the body, one of which is greater demand on the heart under diminished exertion. Efficiency under such conditions is less than when the body is conditioned and reduced oxygen exchange produces greater demand by the heart and lungs to restore balance. As conditioning improves, the distance between demand and response improves. Resting heart rate decreases and performance is improved because the heart and lungs do not have to work as hard to create exchange necessary for demand.
Exercising over extended periods, first beginning with 10 to 20 minutes of cardiovascular exercise, then extending by ten minutes or so each week until you reach a satisfactory level for the chosen goal. Remember to stay well-hydrated and eat properly, getting plenty of rest as well. You can benefit greatly by researching exercise programs online to determine an appropriate regimen for best results. In all cases, however, always break from any routine if you become exhausted because it does not improve stamina.
It is highly unlikely that at 32 years of age, you are suffering from cardiac insufficiency of any type, particularly in light of the fact that you state no other symptoms are present. This is most likely a simple case of poor conditioning due to sedentary lifestyle. Things will improve over time with a steady regimen and discipline to your exercise program.
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Best regards and Good Health