For the past four years I’ve been in the daily practice of measuring my heart rate variability (HRV). It takes me four minutes at best, after sitting up in bed, at the end of the first of my twice daily thirty 30 minute mediation sessions.
(I have maintained a continuous 48 year practice of Transcendental Meditation, which I consider it to be the core technique of my health practices. Yes, I have accumulated over 10,000 hours of meditation practice. Malcom Gladwell put forth the statement that 10,000 hours of “deliberate practice” are needed to become world-class in any field.)
I learned about HRV from a demonstration that I observed in a psychology workshop with Larry Starr, Ed D. Dr. Starr has included neurofeedback in his psychology practice, where he utilizes HRV to reduce client symptoms of ADHD and anxiety.
“Simply put, HRV is a measure of the time gap between individual heart beats while your body is at rest. The heart, in fact, speeds up when you inhale, and slows down when you exhale. This difference is known as HRV. A healthy, well-rested body will produce a larger gap, and higher variability”. – Dr. Phil Maffetone
HRV technology had been around for over 50 years but has only been recently available for home use. Long used in hospitals in treating heart patients, HRV has only recently been applied to endurance training.
I have been totally satisfied with the Sweetbeat HRV App for the iPhone, which pairs via Bluetooth with my Yahoo Ticker chest strap.
Here is a screenshot of two years of data, indicating a positive trend:
From the App Store: “SweetBeat HRV, the newest iOS application by SweetWater Health, provides real-time monitoring using state-of-the-art sensor technology and data correlation algorithms. Patent-pending correlation algorithms provide insight from other health and fitness devices. SweetBeat HRV also integrates and correlates data with popular fitness platforms like MapMyFitness, Fitbit and Withings. The next big thing in body-hacking is to understand the information presented in the data users track every day. SweetBeat HRV correlates metrics like HRV, stress, heart rate, weight, steps, calories, and so much more. SweetBeat HRV utilizes the popular food sensitivity testing and HRV-for-training features in the original SweetBeat app.”
I use the App for two purposes:
1) Primary is in determining whether my body is in a stressed state from over-training. In general, my daily 75-90 minute hike or bike ride results in a higher (better) HRV reading, but if my reading dips, the program prompts me to take an easy training day or even a day off in order to bring my body back into balance.
2) HRV readings also correlate with the occurrence of a cold. I’m generally a healthy guy, succumbing to normal bodily aches, pains, and even tendonitis only when I have tripped on a hike or crashed on my mountain bike. In fact, over the past three years I have not had the flu (I do get the flu vaccine.) and I have only had a single brief cold that lasted for 5 days. My HRV reading dropped significantly one day a couple of years ago, where I was prompted to take it easy and rest up. The next day I experienced a sore throat and two days later my head swelled up with the full-blown symptoms of a bad cold. My initial low HRV reading had been in response to my body beginning to muster antibodies to address the cold, a situation of which I was totally unaware.
HRV literature also reports being able to detect food sensitivities through the use of HRV readings, although I have not attempted to employ this aspect of the technlogy. I’m sort of an I -can-eat-anything-person.
For further reading on HRV, I’ll refer you to this blog post by Phil Maffetone:
Heart Rate Variability: What It Is and How It Helps With Training
By Dr. Phil Maffetone (April 29, 2015)