Skip to main content. Founded in 1938 by Curtis L. Carlson and family-owned to this day, Carlson does business in more than 150 countries and territories. Through our portfolio of operating businesses we have always sought to make business a source of opportunity for others and an engine of positive change in the world.
Since exercise requires more energy, your heart beats faster to deliver more oxygen through the blood. By measuring how fast your heart is beating, Fitbit trackers with PurePulse technology can more accurately gauge how many calories youâre burning.ptimize your health with charts & graphs. Get instant heart rate readings all day, every day. Analyze your heart rate over time to identify trends and manage stress. Review resting heart rate trends to see when health and fitness are improving.
Sinus tachycardia = fast but steady. Sinus tachycardia is a normal increase in the heart rate. How it happens. The sinoatrial (SA) node --- the heart's natural pacemaker - sends out electrical signals faster than usual. The heart rate is fast, but the heart beats properly. Causes of sinus tachycardia.