Reading time: 5 min

Do you know your sleeping heart rate, in other words nocturnal heart rate? If not, it might be time to find out. Several clinical studies have shown that resting heart rate is a key indicator of health, wellness, and longevity. Monitoring changes in your resting heart rate over time can also provide meaningful insight into changes in health.

Understanding your nocturnal heart rate is also important for determining your target heart rate zones, which can guide you to peak athletic performance. Here’s everything you need to know about your nocturnal heart rate — and how to improve it.

What Is Resting Heart Rate?

Heart rate is defined as the number of contractions of the heart, expressed in beats per minute (bpm). Heart rate can be measured during activity (active heart rate), but is most often clinically assessed at rest in the absence of extraneous stress and other factors. 

Resting heart rate is utilized to evaluate an individual’s cardiovascular health and function. While most healthy adults have a resting heart rate between 60 and 80 bpm, factors such as fitness level, body composition, room temperature, body position, stress, and use of certain medications can affect heart rate. 

‘Low’ Resting Heart Rate

A resting heart rate below 60 bpm is considered “bradycardia”, but may be common in individuals with good cardiovascular fitness or individuals taking certain medications. According to Dr. Jason Wasfy at Massachusetts General Hospital Heart Center. “In certain cases, a lower resting heart rate can mean a higher degree of physical fitness, which is associated with reduced rates of cardiac events like heart attacks.” In the case of individuals with good cardiovascular fitness, the stroke volume of the left ventricle is increased, meaning the heart rate may decrease while still maintaining adequate cardiac output.

In other cases, having a low resting heart rate could be indicative of an underlying health concern. According to the American Heart Association, bradycardia can lead to symptoms including lightheadedness, weakness, confusion, fatigue, and diminished exercise performance. Symptomatic bradycardia may indicate that an individual should seek immediate medical advice.

‘High’ Resting Heart Rate

A resting heart rate greater than 100 bpm is considered “tachycardia”, which is often correlated with increased risk of cardiovascular diseases due to chronic additional work placed on the heart. According to Healthline, tachycardia can be caused by anxiety, fatigue, electrolyte imbalance, overconsumption of alcohol or caffeine, drug use, or other underlying medical conditions.

The negative effects of a high resting heart rate were demonstrated in a study conducted by Copenhagen University Hospital. This study found a strong correlation between patients with higher resting heart rates (RHR) and risk of death, specifically a 10% increase risk of mortality for every additional 10 bpm.

Nocturnal Heart Rate

Unlike the traditional resting heart rate values obtained in normal clinical practice, nocturnal heart rate is obtained during sleep. It is normal for nocturnal heart rate values to be slightly lower than waking resting heart rate due to minimal factors impacting the value, and therefore represents a more valuable tool for trending over time to gain valuable insight into changes in your health and performance.

Your Heart Rate During Sleep and Sleep Apnea

Obstructive Sleep Apnea (OSA) is one of the most prevalent sleep disorders in the US with greater than 25 million confirmed cases and research suggesting a high prevalence of undiagnosed patients. During an apneic event, individuals experience a partial or complete collapse of their airway depriving them of oxygen for several seconds. In addition to sleep disturbances, this can lead to an acute change in heart rate and oxygen saturation. 

So what are some indications that you may have OSA? Kathleen Davis states that loud snoring, accompanied by restless sleep and daytime fatigue, could indicate the presence of sleep apnea.

According to Medline Plus, this sleep disorder can cause pauses in breathing that can last from a few seconds to several minutes, with a transition back to normal breathing marked by a gasp, snort or choke, which may startle the sleeper (and often their partner awake). These sleep disruptions have been credited for symptoms of daytime tiredness, even after a full night’s sleep, in patients with sleep apnea.

Fatigue and frustration aside, sleep apnea also affects nocturnal heart rate. “When you stop breathing while you sleep, your heart rate drops, and then your involuntary reflexes make you startle into a micro-arousal, which causes your heart rate to accelerate quickly,” says The National Sleep Foundation. In addition to elevated blood pressure, this rapid decrease and increase in heart rate may lead to an irregular heart rhythm, or cardiac arrhythmia.

Irregular Heart Rhythms and Risks

While irregular heartbeats can be caused by a variety of factors, more studies are revealing the direct relationship between cardiac arrhythmias and sleep disorders such as OSA. One of the most common types of arrhythmia, atrial fibrillation (AF) is marked by irregular contractions of the upper heart chambers.

According to a clinical study conducted at the University of Ottawa, researchers found that OSA may increase the risk of atrial fibrillation with secondary symptoms including palpitations, lightheadedness, weakness, fatigue, shortness of breath, and chest pain. Atrial fibrillation is also associated with stroke, heart failure, and other cardiovascular conditions. 

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Measuring Heart Rate

Maintaining a healthy cardiorespiratory system is important – but what are some ways you can measure your resting and nocturnal heart rate?

This can be accomplished with the old fashioned method of measuring your pulse rate with your fingertips placed on your wrist – just make sure you’ve had ample time to rest after a stressful event or exercise, and under controlled conditions. While this is cost effective (free) and can be done anywhere, there may be issues associated with reliability and these measurements cannot feasibly be performed during sleep. 

Electrocardiograms (ECG) are another method that are commonly used in clinical practice to measure electrical conductivity of the heart to measure its rate of contractions. While this is a relatively quick and very precise method for measuring heart rate and other important aspects of cardiovascular function, the most reliable form (12-lead ECG) is typically not available for the general population to track consistently over time.

Which brings us to perhaps the best solution for measuring resting and nocturnal heart rate in terms of cost, reliability, and availability- wearable technology. These cost-effective technologies unlock the ability for all to consistently track and monitor their heart rate over time to gain valuable insight into cardiovascular function. However, it is important that consumers seek a wearable technology that has proven accuracy compared to the gold standard ECG devices.

Improving Your Heart Rate

When it comes to improving your heart rate, maintaining a healthy body composition and regularly engaging in physical activity are key. According to Harvard Health Publishing, exercising within target heart rate zones can help to strengthen the heart and improve aerobic capacity. To safely and effectively train with heart rate zones, it is encouraged that individuals first seek clearance from their healthcare provider, and consider training under the guidance of a qualified fitness professional. 

Improve Your Nocturnal Heart Rate, Reduce Your Risks

Nocturnal heart rate is an important metric that helps quantify the efficiency of your cardiovascular system. Tracking your nocturnal heart rate over time and gaining knowledge of how certain behaviors are impacting trends can help develop an individualized lifestyle plan on the journey to optimal health and life performance.

Additionally, tracking heart rate may provide valuable insight or early detection of health conditions such as sleep disorders that can not impact your sleep quality, but may facilitate or exacerbate other health-related issues.

Maintaining positive habits such as consistently engaging in physical activity may help strengthen the body’s most vital muscle- the heart. 

Reading time: 6 min

What do catching a ball, walking up the stairs, and covering your eyes have in common? They’re all ways that the body can react to its environment. Fast reaction time, which measures how long it takes for your body to respond to external forces, is essential for leading a safe, healthy life.

You can strengthen and improve your reaction time through a variety of exercises and lifestyle factors. Whether you’re meditating, kicking a soccer ball, or playing For Honor, these science-backed tips will help you improve reaction time both in the game and in life.

What Is Reaction Time and Why Does It Matter?

The senses are engaged in a variety of different ways. Sometimes, it’s just one sense that’s stimulated, such as when you close your eyes in response to bright light. Other times, multiple senses can be involved at the same time, igniting multiple sensory reactions.

Stimulation of the senses results in a signal, which is sent to the central and peripheral nervous systems. These signals are essentially electrical impulses, or messengers, delivering information to the rest of the body. The message travels through the brain, down the spinal cord, and to the areas of the body that need to respond.

Having a fast reaction time means that your brain and spinal cord are quickly sending messages to your bones, muscles, and joints in order to make appropriate movements.

Protecting the Body From Harm

Reaction time is important because it helps protect the body from potential injury and harm. Let’s say you slip and fall on ice — a fast reaction time could mean the difference between catching yourself and hitting your head. It isn’t just getting into an accident that requires a fast reaction time, however.

Ordinary daily actions are also strengthened and made safer by having a prompt reaction time. Driving, walking, cooking, running, and even doing the laundry are all examples of activities that require a fast reaction time. Without a quick reaction, these seemingly mundane activities can become opportunities for injury.

Aging and Reaction Time

Unfortunately, reaction time naturally decreases with age. This is primarily due to impaired or reduced cognitive functioning. As discussed above, quick engagement of the brain is essential for signaling the body to react to its environment. When the brain isn’t reacting at optimum speed, falls and injury are more likely to occur.

This was demonstrated in a study on older cancer survivors, which sought to determine the relationship between cognitive function, physical mobility, and falls. The study found a direct connection between decreased brain functioning and falling-related injuries.

“As the cognitive processes of recall, orientation, and executive function become more impaired in this population, falls incidence increases, gait speed decreases, and balance becomes more impaired,” says Jennifer Blackwood, the study’s author.

This suggests that falls among older people are directly related to a reduction in simple reaction time. This is especially true for more complicated movements that involve multitasking, increased motor response, and more complex thinking. It also suggests that simple aspects of physical mobility, such as walking, gait speed, cadence, and step length, are all associated with a decline in reaction time. This is why the risk of falling often increases with age: It becomes harder to catch yourself and prevent injury as reaction time slows.

How to Improve Reaction Time With Lifestyle Changes

Unlike reflexes, which aren’t processed by the brain, reaction time can be strengthened and improved through lifestyle changes. Cognitive exercises, meditation and mindfulness, and nutritional supplements are all factors that can boost reaction time in a safe and healthy way.

Cognitive Exercises

First and foremost, increasing reaction time requires that you strengthen the brain. Learning new things and challenging the brain helps strengthen neurons and decrease the brain’s response time.

Using your non-dominant hand to do things you normally do with your dominant hand is one simple, yet effective cognitive exercise. Signing your name or drawing basic figures asks your brain to think in an entirely new way, thereby rewiring neural pathways. Brushing your teeth, eating, pouring a drink, or using the remote are all things you can try with your non-dominant hand.

Meditation and Mindfulness Exercises

Multiple mindfulness exercises have proven to reduce the length of time it takes to react to external forces. Meditation, for example, has the ability to calm the mind while strengthening the brain’s responses. The relationship between meditation and reaction time was explored in a study on 45 young, healthy volunteers. The participants practiced guided meditation for a course of 12 weeks.

The results showed that the meditation had a positive impact on auditory and visual reaction time. In addition to improving reaction time, meditation also increased alertness. Another study on yoga breathwork showed that simple breath awareness in women can improve reaction time and increase one’s ability to pay attention.

Similarly, yoga asanas (physical poses) have been shown to reduce delays in reaction time while improving mobility and mental functioning. Findings from one study showed that yoga had a positive impact on mobility, reaction time and the overall well-being of diabetes patients. Specifically, leg lift variations such as waterfall pose (lying down with the legs lifted in the air), improved body systems associated with reaction time.

Nutrition and Brain Health

It’s clear that proper brain functioning is critical for fast reaction times. Eating a diet that nourishes the brain and spinal cord can help maintain your motor skills and reflexes. Antioxidants, for example, contain polyphenols that protect the brain from the negative, age-related impacts of stress, which can contribute to cognitive decline.

Foods like blueberries, raspberries, blackcurrants, and pomegranates are a source of this nutrition. Vitamin K, found in broccoli, is another essential nutrient for brain health because it’s directly related to proper brain functioning. Caffeine and reaction time also have a positive relationship. In a study on people who practice tae kwon do, caffeine increased reaction time during combat.

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Athletic Performance, Video Games, and Reaction Time

While some aging-related changes are inevitable, staying physically fit and playing sports can help you maintain quick brain functioning over time. If you’re an athlete, reaction speed is directly tied to high athletic performance. Whether it’s catching the ball, sprinting to the finish line, or kicking the goal, quickness is essential for winning the game.

Think about it: a soccer goalie only has about 0.3 seconds to react during penalty kicks. Quick reaction is essential not only for winning the game, but for being able to play at all.

How to Improve Reaction Time with Sports

Wondering how to improve reaction time? Exercises such as ladder drills, agility drills, and specialized plyometrics can aid in decreasing reaction time. Elite athletes are also turning to digital reaction drills to help the brain process more information in less time. Kawhi Leonard of the Toronto Raptors used strobe glasses to help the brain process visual stimuli more quickly and efficiently. Similar to ball drills, these goggles have strobe lights inside, which forces the brain to work through more complicated stimuli than usual.

“Once the lights are off, the brain will be able to process information much faster as there is no more interference. This allows for faster movement and swifter reaction time,” says Dr. Alan Reichow, who helped develop the glasses.

To improve your reaction time for increased athletic performance, a tennis ball is an invaluable tool. A six-sided ball called a reaction ball or bouncy ball can also work. Simply throw the ball against a surface so that it can bounce back at you. This makes your mind think more quickly because you have to catch the ball before it goes elsewhere.

Repeating the same motion over and over is another way to improve your brain’s ability to process information. It helps turn a sports move, such as catching a tennis ball, into an involuntary reflex that the brain doesn’t have to think about before making.

How to Improve Reaction Time With Video Games

While many gamers get slack for staring at their screens all day, most people don’t know just how much their brain is at work. In fact, numerous studies over the past fifteen years have demonstrated that people who play action video games have higher cognitive abilities than people who don’t. This is because action video games, like Counter-Strike, Fortnite, and For Honor, all require a very fast reaction time in order to play. They also require skills associated with reaction time, such as spatial attention, multitasking, and adapting to predetermined rules.

Another study on action games and the Simon Effect showed similar results. The Simon Effect, a conflict in the attention system, is when reaction time slows down as sensory stimulants are moved farther away. The Simon Effect is present in sports where a ball kicked from father away may be harder for a goalie to stop. This study showed that action video games can lessen the negative impact of the stimulus being far away. In other words, playing action games can improve reaction time, regardless of where the stimulus is.

The Importance of Reaction Time for Health and Longevity

A fast reaction time is essential for safe mobility, healthy aging, and peak athletic and gaming performance. Although reaction time naturally slows over time, there are many ways to train the brain to react more quickly. By decreasing the amount of time it takes to react, you can prevent injury and harm, and become more resilient against potential dangers.

Mindfulness exercises like yoga, breathwork, and meditation all play a role in making the mind stronger. Sports like tennis and soccer can also improve reaction time, especially when played repetitively. Whether you’re catching a soccer ball as a goalie or playing your way through a video game, focusing on your reaction time can undoubtedly improve your long-term quality of life.

Reading time: 4 min

What is a gym to you?

For some, this place may be a sanctuary for the fitness devoted:

A pseudo-religious experience where your barbell lift MUST be executed with perfect form. Your rest MUST precisely be 30-second intervals. You MUST run on the treadmill for a minimum of one hour. And don’t you dare try to strike up a conversation with someone plugged into their Beats by Dr. Dre Headphones… lest you receive the death glare.

For others, it’s more of an anthropological adventure. Think about it – when else can you enter a public space where people give each other unspoken, socially accepted permission to be in ridiculous body positions. I can’t think of too many.

Maybe you think that going to the gym is the only way to become truly healthy and improve biometrics like Heart Rate Variability and Oxygen Saturation. But that is far from the truth! You don’t have to sacrifice fun for fit. As a matter of fact…You can have both:

You can train like a ninja!

Yes, you heard me right. Calisthenics is ninja training.

What is Calisthenics?

Calisthenics is bodyweight training. Any movement that ONLY utilizes your bodyweight can technically be considered calisthenics.

According to the Centers for Disease for Disease Control and Prevention (CDC), only 21.7% of adults 18 years of age or older met the Physical Activity Guidelines for both aerobic and muscle-strengthening activity. Most fitness activities tend to lean toward aerobic or anaerobic exercise. Calisthenics, on the other hand, are a balanced combination of both.

So why should you do calisthenics? Here are a few reasons why:

Become stronger & leaner

It’s fun!

No gym membership costs

No fancy equipment required

Choose WHEN + WHERE to exercise

If you’re like most fitness beginners, you haven’t worked out in ages. And if you’re the type of person who hates learning complex things, you probably avoid the gym like the plague. The beauty of calisthenics is that it’s straight-forward. But don’t let the ‘easy-to-understand’ movements fool you. Calisthenics will kick your butt.

So how should a beginner start calisthenics training?

With the help of Madbarz, we’ve put together the ultimate beginner calisthenics workout plan you can start immediately:

1. MONDAY: No Equipment Day

Madbarz
No Equipment Workout

4 Rounds:

Max Plank (Hold plank for 30 seconds if you’re a complete beginner)

8 Squats

8 Lunges (each leg)

8 Push Ups

8 Laying Down Leg Raises

Max Mountain Climbers (Do 20 each leg if you’re just starting)

8 Pike Push Ups

This routine is the BEST WAY to start calisthenics because it doesn’t require a single equipment. You can do these in your living room, bedroom, office, in the park – wherever! These foundational exercises will help build up your strength and endurance to perform advanced movements in the future. Think of these as your calisthenic building blocks.

2. TUESDAY: Basic Beginner Day

basic beginner
Basic Beginner Workout

4 Rounds:

7 Close Hands Chin Ups

5 Pull Ups

6 Dips

15 Push Ups

5 Leg Raises

9 Jump Squats

15 Australian Pull Ups

This workout introduces you to calisthenic exercises that require some sort of bar to hang from. Pull up bars are cheap & you can easily get one online or pick one up at a sporting goods store. Most of them will fit your door-frame without causing damage. If you’re feeling outdoorsy, find a park near you that has bars or a playground!

3. WEDNESDAY: Rest Day!

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4. THURSDAY: On-The-Go Day

on the go
On-The-Go Workout

4 Rounds:

20 Wide Push Ups

20 Mountain Climbers

60 Seconds of Wall Sit

15 Clap Push Ups

30 Seconds of Superman Hold

30 Squats

60 Seconds of Plank

5. FRIDAY: Fat Removal Day

fat removal
Fat Removal Workout

4 Rounds:

100 Meter Run

5 Dips

45 Seconds of Jumping Jacks

8 Push Ups

30 Seconds of Alternating High Knees

30 Seconds of Mountain Climbers

15 Seconds of Plank

6. SATURDAY: Beginner HIIT DAY

We’re throwing in a beginner’s high-intensity interval training (HIIT) workout because it’ll really boost your cardio & calisthenic stamina. HIIT sessions are also proven to be incredibly effective when it comes to fat loss.

4 Rounds:

15-second sprint (Run as fast as you can!)

45-second walk (Don’t stop in place. Keep walking)

1 Round:

30-second sprint (Run as fast as you can!)

1:30 seconds walk + recovery

4 Rounds:

15-second sprint (Run as fast as you can!)

45-second walk (Don’t stop in place. Keep walking)

1 Round:

30-second sprint (Run as fast as you can!)

1:30 seconds walk + recovery

7. SUNDAY: Rest Day!

Don’t forget to wear your Biostrap and share your calisthenics progress with the Biostrap community! We want to see you transform yourself into the strongest & healthiest version of you.

Reading time: 5 min

My experience as an athlete

As a health coach and fitness trainer and being 53, I place a huge importance on the optimization of my health. I also love to challenge what I call conventional stupidity approach to health, fitness and life. I do things a bit differently than most Triathletes and Marathoners and Personal Trainers. I fundamentally believe we need to rest more, reduce chronic stress, and connect more with what is going on in our bodies.

I use a wide range of subjective measures in relation to my health and fitness. Subjective measures such as how I feel, my energy levels, my bowel movements, my mood, my ability to think and make decisions, and of course how I feel when I am in the gym, the pool, the track or on the bike. Some people place a lot of importance on Objective metrics and numbers and tend to negate the Subjective measures.

I think it is very important to have a good balance between both.

I recently found this to be important when I started looking at biometrics. I was looking at my RHR, O2 Saturation, Respiration and HRV all from a nocturnal measurement lens. I found there was a trend for my HRV to be quite low and I mean low 32, 41, 35, and it did not vary much regardless of if I had had a 5 hr training day or a rest day. It also did not vary based on my RHR, or how I felt. I was very confused. I was worried, I was starting to think something was wrong. There was a huge disconnect between the subjective rating I would give myself for my state and the objective numbers provided by the HRV tool I was using.

So I tried several HRV devices/applications and tools and they all seemed to show the same result. I was desperate for a deeper understanding of what was going on.

My experience with Biostrap

So why is this so important? Well I am a serious AG athlete. Last year I raced in the 70.3 Ironman World Championships and I train about 13 hrs a week and I am serious about my sport. This was important to me. I also feel that recovery is one of the key pillars of health and fitness.

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The last thing I want to do is cause further stress to my body that would impact my ability to recover, ie doing a solid training session when not fully recovered.

I started looking at a system for biometrics that to me appeared to be more focussed on HRV than simple fitness tracking, it also provided the ability to do a 2 minute biometric scan. I decided to give this a trial. It is called Biostrap.

I had been hearing a lot about the fact that nocturnal HRV reading for elite athletes could be not effective due to a phenomenon called “parasympathetic saturation

My understanding is that this has been reported in high level ultra-marathoners, triathletes and endurance athletes that are more susceptible to it in the supine position simply because you’re in a more rested or relaxed state where our heart is not being challenged to overcome gravity, to pump blood upwards and so forth. When you already have a very low RHR lying down makes it even worse.

Andrew Flatt PhD, CSCS

Andrew is a highly qualified practitioner in this field and writes fantastic content around biometrics. Flatt explains in more detail:

“Parasympathetic saturation, the results of would be having decreased heart rate variability despite having a very low resting heart rate, which is counterintuitive because typically, the lower your resting heart rate, the higher your heart rate variability is. There tends to be an inverse relationship there. But what’s happening kind of physiologically is that the acetylcholine receptors on the heart that respond to vagal stimulation, the vagus nerve is going to release acetylcholine which will bind to the muscarinic cholinergic receptors on the heart, and that tends to slow heart rate down”

So after reading all of this one morning before training I decided to conduct a Sitting biometric scan.

“Kiviniemi et al. (2007) provides a very thorough explanation of why HRV might be better measured in a standing position as opposed to seated or supine. Essentially, HRV is susceptible to saturation of the parasympathetic nervous system in subjects with low heart rates”

Yes, this is me at 36-41 RHR.  I got excited maybe I found the reason why my Nocturnal HRV was so low. He further explains:

“Mourout et al (2004) saw decreased HRV in overtrained athletes compared to not overtrained athletes in the supine position. Similar results were found when HRV was measured after 60 degree tilt. The non-OT group always had higher HRV in the standing position and saw greater reactivity to the postural change. Therefore, pick a position and stick to it 100% of the time for your values to be meaningful. Switching positions from day to day will provide skewed data.”

Endurance athletes and athletes with low resting heart rates (yes that’s me) are probably better off measuring HRV in a standing position. We understand that when an elite athlete has a very low RHR then they are likely to be in a state of parasympathetic saturation. Andrew Flatt Explains this as follows:

“This is when vagal HRV markers (e.g., lnRMSSD) are low despite a low resting heart rate. This has to do with excess acetylcholine within the myocardium that maintains inhibitory actions on the SA node, and thus limits the typical arrhythmia observed from respiration. See below”

“There are several potential explanations for the decrease in HRV with increasing parasympathetic effect. If with increasing blood pressure there is higher-frequency vagal discharge and inspiratory suppression is maintained,18 23 then there must be persistent parasympathetic effect during inspiration despite the suppression of vagal nerve discharge. In in vitro preparations, the dose-response curve to acetylcholine has a rapidly rising portion and at higher concentrations is flat,24 25 displaying a simple saturation relationship. High-intensity vagal nerve discharges during expiration may release enough acetylcholine to result in saturation of the parasympathetic effect during expiration. If acetylcholine concentrations during expiration are high enough, the expected decline in acetylcholine concentrations in the region of the sinus node during inspiration may not be enough to significantly diminish the parasympathetic effect. Alternatively, it is possible that with increasing blood pressure, there is loss of phasic respiratory changes in vagal nerve discharges,26 resulting in a loss of phasic effect and a decrease in HRV. It is unclear which mechanism is operative in humans.”

 

Goldberger, J. J., Challapalli, S., Tung, R., Parker, M. A., & Kadish, A. H. (2001). Relationship of heart rate variability to parasympathetic effect. Circulation, 103(15), 1977-1983. http://circ.ahajournals.org/content/103/15/1977.full.html

So if you are using an HRV device, and you have a low RHR  maybe you should do a self check and consider are your Objective numbers from your HRV app lining up with the Subjective measures and, if not, consider using a device that allows you to do a sitting or standing biometric scan.

Did we miss anything?

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