<unk>  (also sinus<unk>  is a slow resting heart rate, commonly under 60 beats per minute (BPM) as determined by an electrocardiogram. It is considered to be a normal heart rate during sleep, in young healthy or elderly adults, and in athletes. In some people,<unk>  below 60 BPM may be associated with fatigue, weakness, dizziness, sweating, and fainting. The term "relative<unk> " is used to refer to a heart rate slower than an individual's typical resting heart rate. Athletes may have athletic heart syndrome, which includes<unk>  as part of the cardiovascular adaptations to training and participation. The word<unk> " is from the Greek βραδύς bradys "slow", and καρδία kardia "heart".
Bradycardia
Hypopyon
Tachycardia
Sinus bradycardia
Apnea
Reflex bradycardia
Cardiovascular drift
Bradypnea