Heart rate variability (HRV) is a widely studied physiological phenomenon ... both within and across subjects, tend to approximate normal distributions more than do the raw spectral band power ...

If you wear a fitness tracker, you've likely seen a stat labeled "HRV" pop up on your screen. But what does it mean, and does it matter? Short for heart rate variability, HRV has become a popular ...

A new study published in the journal of Frontiers in Endocrinology revealed that low 25-hydroxyvitamin D [25-(OH)D] levels ...

Abstract: Low-frequency-to-high-frequency ratio (LF/HF) of heart rate variability has been used as a maker of stress or sympathetic predominance in cardiac autonomic activity. Laboratory studies, ...

Nearly half of patients with symptoms of heart failure are found to have a normal left ventricular (LV) ejection fraction. This has variously been labelled as diastolic heart failure, heart failure ...

Like the Garmin HRM-Pro Plus before it, the Garmin HRM 600 goes beyond simple heart rate tracking by provides running dynamics stats when paired with a watch. It can even track exercise activities ...

A faster than normal heart rate is common when walking up a set of stairs or cleaning your house. However, a heart rate over 100 beats per minute (bpm) without any physical activity might be cause for ...

Anemia can be caused by an excess loss of blood through laboratory testing and phlebotomy. Heart Rate Variability (HRV) has been known to be an indicator of distress within the body and research has ...

Heart rate variability (HRV) is reported increasingly ... that were blind to the study hypotheses. Data for healthy normal adults in normal sinus rhythm (sampled at a rate of 128 Hz on a Holter ...

Heart rate variability (HRV) is the temporal variation of the period ... Another used time domain is the standard deviation (SD) of the interbeat intervals of normal-to-normal RR intervals (SDNN, ...