Heart rate
| Age | Normal resting heart rate (beats per minute) [1] |
|---|---|
| Newborn | 120 |
| Older Child | 90-110 |
| Adult | 50-100[2] 60-100[3] |
Heart rate (HR) is how many times a heart beats per minute (bpm). The average bpm for a man or women who does not exercise is 70 bpm. Heart rate varies between people because of fitness, age and genetics.
Heart Rate Media
A medical monitoring device displaying a normal human heart rate
Anatomy of the Human Heart, made by Ties van Brussel
Autonomic innervation of the heart: Cardioaccelerator and cardioinhibitory areas are components of the paired cardiac centers located in the medulla oblongata of the brain. They innervate the heart via sympathetic cardiac nerves that increase cardiac activity and vagus (parasympathetic) nerves that slow cardiac activity.
Effects of parasympathetic and sympathetic stimulation on normal sinus rhythm: The wave of depolarization in a normal sinus rhythm shows a stable resting HR. Following parasympathetic stimulation, HR slows. Following sympathetic stimulation, HR increases.
Heart rate (HR) (top trace) and tidal volume (Vt) (lung volume, second trace) plotted on the same chart, showing how heart rate increases with inspiration and decreases with expiration.
Resting heart rate recorded in an elite athlete demonstrating bradycardia at 42 bpm
An elite athlete's heart recorded during a maximum effort workout maintaining over 180 bpm for 10 minutes.
Fox and Haskell formula; widely used
The various formulae provide slightly different numbers for the maximum heart rates by age.
At 21 days after conception, the human heart begins beating at 70 to 80 beats per minute and accelerates linearly for the first month of beating.
References
- ↑ Daniel Limmer and Michael F. O'Keefe. 2005. Emergency Care 10th ed. Edward Pearson, Prentice Hall. Upper Saddle River, New Jersey. Page 214.
- ↑ Adult Health Advisor 2005.4: Tachycardia. Retrieved 2009-06-26.
- ↑ 2 easy, accurate ways to measure your heart rate. Mayo Clinic.