Heart Rate Variability (HRV) Testing

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Heart Rate Variability (HRV) testing measures the subtle variations in time between each heartbeat. By analysing these fluctuations, we gain insight into how effectively your body manages stress, adapts to daily challenges, and maintains balance in your autonomic nervous system (ANS). It’s a valuable tool for assessing overall health, resilience, and cardiovascular function.

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Stress and recovery insight: HRV highlights how well your body copes with physical and psychological stress, indicating potential improvements in lifestyle or treatment plans.
Cardiovascular health: Low HRV can signal an increased risk of heart-related issues, making early interventions crucial.
Performance optimisation: Athletes and fitness enthusiasts use HRV to fine-tune training intensity and recovery periods.
Holistic health marker: HRV reflects overall wellbeing, providing insights into sleep quality, mental health, and hormonal balance.

Step 1: Measurements

Sensors are attached to your arms and ankles to record your heartbeats over a short period.

Step 2: Analysis

The recorded data is analysed using advanced algorithms that are able to determine from the natural variations in timing between your heartbeats how well your body’s regulatory/control systems are working.

Step 3: Consultation

Dr. Nyjon Eccles, BSC, MBBS, MRCP, PHD, will review the results, explain your HRV score, and outline any recommended lifestyle adjustments or advanced treatments to improve and optimise any imbalances in your autonomic nervous system.

Step 4: Monitoring

HRV testing can be repeated periodically to track improvements over time, ensuring that any recommended interventions are yielding the right results.

HRV testing complements hormonal and metabolic assessments, providing a fuller picture of a woman’s health status.

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For men seeking insights into stress management, energy optimisation, and andropause-related issues, HRV testing is an excellent add-on.

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Comprehensive Men’s Health Check With Dr. Nyjon Eccles

HRV Testing

30 mins at The Natural Doctor Clinic, London

£120

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Initial Zoom Functional Medicine Consultation

up to 45 mins

£395

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By providing thorough evaluations and innovative treatments through HRV testing, Dr. Eccles empowers you to take control of your wellbeing and enjoy a higher quality of life at every stage.

For more information or to make an appointment, contact us or call 0207 2244 622.

For more information or to make an appointment, call us on 0207 2244 622 or email info@thenaturaldoctor.org

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4.8

The Natural Doctor - Breast Health & BHRT Clinic London

4.8

Lynn Hannay

16:39 17 Aug 26

very professional and supportive. I was immediately made me feel at ease and cared for .

Annie FIELD

16:14 14 Aug 26

Very efficient and slick procedure. I would certainly recommend the Natural Doctor

Donna Burgoyne

10:47 17 Apr 26

"This was my 4th time at the clinic for my annual thermogram. The atmosphere is very calming. I was met by Nazret who immediately put me at ease and explained the procedure..Once again the whole process was conducted very professionally and all questions I asked were either answered either immediately or also emailed later to me.I highly recommend an appointment for piece of mind."

Zion4

14:57 09 Apr 26

Having attended The Natural Doctor's Clinic on 3 occasions over the past few years for Breast Thermography Screening, followed by consultations with Dr Eccles, I wholeheartedly recommend this great service for women.If, like myself, you prefer to use an alternative to Mammography for breast screening, Thermography is a great, non-invasive, pain-free method of identifying early on any areas of potential concern. My experiences with the Clinic have all been very positive. The pre and post-appointment communication is very thorough and helpful. The clinicians that carry out the screening have been personable, kind, attentive women, who put you at ease during the procedure. And with Dr Eccles you are in safe hands; he is approachable, amicable whilst highly professional; he clearly cares about his patients and getting the best outcomes for you, using natural therapies and supplementation, and I thoroughly endorse his Thermography service.

Maureen Mcgachan

12:20 26 Feb 26

I had my first thermocheck with Nazret on the 18th Feb 2026.I was made very welcome at the clinic , Nazret was very patient with me as I was a bit nervous and unorganized! She was professional, helpful and knowledgeable.

Tracey Edwards - Red Ox

16:10 17 Jan 26

Excellent communication, professional and polite staff, well presented clinic, great location.Appointments conducted in a sensitive and appropriate manner, putting me at ease.Very well looked after and all enquiries dealt with swiftly and efficiently.Highly recommend!

Lynn Hannay

17:31 21 Nov 25

very professional and supportive. Michelle immediately made me feel at ease .

Julie Berry

17:01 17 Nov 25

Just been for my annual breast thermography at the Natural Doctor. Always a delight - the technicians that do the scans are all lovely and you know you are in safe hands. Such. a good way to take care of your breast health - non-invasive and picks up any problems in plenty of time to put things right before they get serious. Highly recommended.

Claire

18:14 14 Nov 25

Honestly it feels strange to say this, but it was such a lovely experience from beginning to end!I was looked after my the lovely and incredibly tentative Nazaret (apologies if I have spelt this incorrect) after experiencing breast appointments elsewhere which have left me wary, it’s safe to say that today restored my confidence and I took great comfort knowing this service is so well thought out and accessible to all 💫⭐️✨🌟Thank youClaire 😊

Sian Bristow

22:17 24 Oct 25

Very relaxed and comfortable atmosphere which puts you at ease. Staff are are very helpful and if unable to answer any questions they will find out and email the answer.

Caroline Collier

15:34 29 Sep 25

Very professional and would thoroughly recommend. Katia explained the process really clearly.

Marina Helenius-Beal

11:15 26 Sep 25

Thank you so much to Katia at The Natural Doctor for her outstanding service during my thermo scan. I couldn’t have been treated any better, she was professional, kind, and made the whole experience so comfortable. I would highly recommend Dr. Eccles and The Natural Doctor team to anyone looking for expert, compassionate care.

Fiona Whitby

19:30 11 Sep 25

I attended the clinic today to have a thermogram breast scan.I was welcomed by reception. I arrived ahead of my scheduled appointment and was happy to be seen earlier than expected.The technician was lovely and made me feel at ease throughout the procedure

Sonia Brown

11:38 11 Aug 25

Thank you so much for offering so much education and insight as part of the process. The scanning technician was so so so lovely. Every step of the process was fully explained. Looking forward to getting the report and using this as part of a proactive way of looking after my health.

Mayellen Phelan

06:47 09 Aug 25

I booked in to have my repeat follow up breast thermography scan, as always I was met by a lovely female scan technician who immediately put me at ease and answered any questions I had thoroughly and sensitively. I thoroughly recommend Dr Eccles and his team for anyone wanting to have a painless, safe and accurate alternative to a mammogram.

Tatina Semprini

00:49 18 Apr 25

I've been having these thermal breast scans (breast thermography) since 2008. It's a quick and easy treatment as well as comfortable and non-invasive, and it gives me peace of mind knowing it's safe and has no bad side effects like radiation. I also like to be proactive and know what's happening in my body on a regular basis so I can deal with it promptly if necessary. The staff has always been very friendly and helpful, so the whole experience is a pleasant one.

Nicola Barnes

20:15 29 Nov 24

The scan technician was really friendly and put me at ease. She was very knowledgeable about thermography and about the other treatments on offer at the Natural Doctor. I would definitely recommend the treatment.

Julia S

14:08 27 Nov 24

Great quality vitamins that are always delivered in a timely fashion! The staff at The Natural Doctor are always very friendly and helpful.

Joanne Kehoe

11:07 28 Oct 24

After suffering Breast Cancer 6 years ago I knew I had to be in charge of my own breast health .So after searching I found Dr . Eccles and he's changed my whole life approach to breast health .I now feel reassured and can get on with my life knowing I'm doing everything I can to stay healthy .I highly recommend Dr.Eccles and his team . They make you feel really comfortable throughout.

Sonia Rossi

22:12 22 Apr 24

Absolutely great service, been going for a number of years now, for the thermographic breast imaging. Staff is very professional and very kind and observant at the same time. Results come through within a couple of days.Would continue to use this service as an alternative to mammogram, for as long as the clinic is there.

Catherine Hancox

11:31 16 Mar 24

I have found all the staff to be helpful and understanding.A pleasure to deal with.My consultation with Dr Eccles was not only informative medically speaking, but he also tried so hard to find a solution to my problems. At the end of the consultation, I felt much calmer. I really felt as if he were 'routing' for me. I am most grateful.

Julie Berry

15:44 06 Oct 23

Always a delight to pay a visit to the Natural Doctor. He's currently the only doctor I trust. Genuinely concerned with people's health. I've been having regular thermal scans for years, having been pegged as 'at risk' for breast cancer. All the ladies that do the scans are lovely and you know you are in safe hands with his advice on how to put things right if they look a bit dodgy - the scans pick up any problems way in advance of anything serious. A no-brainer for me.

Muxloe Property

19:48 17 Jun 22

The Dr helped me feel like myself again after lots of low level symptoms. My GP dismissed me. It was worth every penny. Thank you

Janie Wolf

09:06 31 May 22

Dr Eccles has given me my life back, because he has balanced my hormones in a way that enables me to live my life to the full again!I was not only suffering with menopause fatigue and the many other symptoms of menopause, but I had ongoing lethargy with Auto-Immune Hashimotos and a struggling thyroid. It came to the point I didn’t know which symptom was due to which hormone deficiency.After my second thorough consultation with Dr Eccles, he had tweaked my dose and found I was indeed Iodine deficient. Now I am beginning to have normal levels of energy again and it is getting better and better, for the first time in five years! I sleep like a baby and my overactive bladder has been calmed. I am so glad I found Dr Eccles, life is too short to suffer with debilitating symptoms, he is the best doctor for me!

Nicky Emlick

21:19 23 Feb 22

Highly recommend this practice. My experience so far after taking the thermogenic breast scan, and Bio identical hormone replacements has been a very pleasant and informative process.

Crazy T

10:06 27 Oct 21

I started seeing Dr Eccles almost 3 years ago for fertility issue , after struggling for 9 years and 2 miscarriages 2 years a part .I had done blood test with them and was on natural hormonal medication for almost 2 years ,and it worked for me and i fell pregnant and i have a 5 month old son now .I am still seeing him for general health and hopefully working towards second pregnancy.He is amazing , listens to every concern and answer all queries very nicely and in friendly manner and girls at receptions are also great and quick at responding to any questions or concerns i might have.

Kelly Hafner

15:58 09 Sep 21

I began to see Dr Eccles six years ago and he continues to provide excellent care and attention every time I see him. I have referred several friends to him and they have all been very happy. Both Dr Eccles and his staff genuinely care and always go the extra mile. I highly recommend him for all areas of female health, immunity and healthy ageing in general!

Victoria Harris

09:54 12 Aug 20

A very friendly but professional service. Experts in their field that go over and above to ensure you have the best service and experience.Highly recommend.

Alison Kittle

14:33 14 Aug 19

Been visiting this clinic for nearly 10 years. It reassures me about my breast health and if I raise any concerns they are always answered well. Staff are professional but friendly. Dr Eccles knows his field. Will keep returning for my check ups. Peace of mind is worth so much.

maria

13:27 16 Jul 19

For several years I have been seeing Dc Eccles for general l wellbeing. After I started seeing him, I felt much better. Excellent Doctor with very good supplements and product. I highly recommend Dr Eccles and his prescription.

Anwen Pragnell

14:50 20 Jun 19

A recent breast health scare in my 30's lead me to seek a less invasive option to check breast health. The Thermocheck scan, detailed report and Skype consultation with Dr Eccles was very professional and reassuring. I now feel more informed and supported in preparation for my hospital appointment. I highly recommend Dr Eccles and his team to provide an efficient, professional service and support your health naturally.

Arthur Moore

09:27 16 Jan 18

Thank you for giving me the opportunity to use your excellent product. Although it has only been 2 weeks, both myself and my wife have noticed, the hair growth has certainly become thicker, more of a covering. This is very encouraging, following many years of not really being bothered about my hair loss, now that I am noticing an improvement I am very excited at the prospects of once again having a full head of hair.

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Heart Rate Variability (HRV) Testing

What is Heart Rate Variability testing?

Why Undergo an HRV Check?

What’s involved in a HRV Testing?

Optional Add-On Services

Related treatments

Well Woman Check

Well Man Check

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