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.
About Tachycardia (Fast Heartbeat) If you have tachycardia, your heart may beat up to 400 times per minute. This can cause dizziness, lightheadedness, or a fluttering in the chest. Tachycardia is a fast or irregular heart rhythm, usually more than 100 beats per minute and as many as 400 beats per minute. At these elevated rates, the heart is not able to efficiently pump oxygen-rich blood to your body.