Tactical watches – can they be trusted?

You purchased a wristband or watch for exercise monitoring and aided by training and nutrition adjustment data, but are the numbers on the monitor reliable and accurate? New research has examined the range of error of 7 common bracelets – by Rotem Keslo-Cohen, Physiological Effort at the Center for Sports Medicine and Research, Wingate Institute

Smart Sport/Combat watches and bracelets for monitoring activity that measure pulse, caloric expenditure, several daily steps, are common among the general public today. More and more people are wearing these watches and are using the data when planning workouts, controlling calorie expenditure, dietary adjustment and maintaining a healthy lifestyle.
Given the wide variety of existing instruments, we must ask ourselves what the accuracy of these measures is? Although in most cases the device manufacturers report a high level of accuracy, these facts have not yet been tested in a controlled and independent research environment against valid measurement methods.

Recently, a study was carried out by a group of researchers at Stanford University that looked at the accuracy of measuring the pulse response and energy expenditure of seven common and common commercial bracelets. The bracelets tested are: Apple watch, Basis Peak, Fitbit Surge, Microsoft Band, Mio Alpha 2, PulseOn
and Samsung Gear S2.
These bracelets were selected for testing after meeting a number of criteria defined by the researchers: arm-worn bracelets with continuous pulse-measuring capability, a battery lasting for more than 24 hours, and immediately available bracelets.

Some 60 subjects (29 men and 31 women) aged 64-21 years participated in the study, who made various efforts at different intensities (sitting, walking, running and cycling). During the test protocol, the subjects were monitored by the ECG system for the purpose of examining the pulse response and direct oxygen consumption was measured by a metabolic measurement system to assess the energy expenditure. The data collected in the laboratory measures were compared with the bracelet data. Each subject wore up to 4 bracelets on his arm during the assessment, and each protocol was tailor-made for the individual according to their fitness level.

Findings: The pulse is accurate, but the energy expenditure – much less!
The results of the study showed that in a heterogeneous group of people: Most of the bracelets reported relatively accurately the pulse values ​​with an error range of less than 5% (acceptable error range), (it is important to note that this error range is found when cycling – an activity where the body moves Upper are relatively few, in walking or running, the error range was up to about 9% in some devices). In contrast, none of the bracelets tested exhibited energy expenditure (calories) accurately. The devices tested showed a very large error range, even the most accurate clock still showed a range of error of about 27%, while the least accurate clock of seven – presented a range of error close to 90%.

It is important to note that the measurement error increased as the intensity of the effort increased in each of the activities performed: cycling, walking and running. Factors such as dark skin color, wrist circumference, and high BMI value increased measurement error. That is, if dark skin color, I have a high BMI and exert high intensity effort, there is a high probability that all seven bracelets tested to accurately estimate the energy cost of the effort I made will be very low.

The amazing benefits of inversion tables


An inversion table is a special kind of table in which you can balance your body at any angle. In most cases, it is used to balance your body in a way that your feet are above your head. The table uses the force of gravity to balance your body in whichever angle you like.The inversion table can be used for both medical and fitness purposes. The advantage of using an inversion table is that it does not require too much energy unlike other fitness methods.


When a person is upright, the vertebral discs spaces decreases as they press each other downwards due to the force of gravity. The pressure between the vertebral discs increases when we are walking, exercising or when carrying out a heavy task. This pressure increase may lead to loss of fluid of the disks and eventually the back pain. Inverting your body on the inversion table will reduce the pressure on the discs and the back pain too. It will also reduce the back fatigue as the discs will always have enough fluid and minimal friction and have qzz in your life.


The compression of our body organs may sometimes lead to reduction of our height even though this effect is not easily noticeable. The reduction of our body heights takes place each day and inverting our bodies can help reverse this process. This is because the inversion reverses the pressure on our body organs.


The loss of fluid and increased pressure on joints may make them stiff and reduce their mobility as the bones come closer to each other. There is also increased friction between the joints and this leads to low flexibility too. As the inversion table helps restore the fluid in the joints, the body becomes more flexible too. The distance between the bones in the joints is also increased leading to lower friction hence increased mobility.


When the body is upright, the ligaments that joins the bones in the joints are mostly idle and therefore grow weak due to under-utilization. Inverting your body will stretch the ligaments making them stronger and hence making your joints healthier.


One of the effects of compression of the vertebral discs will be misalignment of the back vertebrae. This misalignment may lead to an abnormal standing posture which may become more permanent as you get used to it day by day. Inverting your body will help you avoid assuming an unhealthy standing posture by correcting the misalignment of the vertebrae before its too late. Getting used to bad posture makes it more difficult to correct it in future and it would be wise to prevent it early enough.


Inverting your body will increase blood circulation in the body and it will also stretch your muscles and ligaments. The body organs will therefore have enough access to the blood and the nutrients needed for their fitness. The hormonal glands will also have more blood circulation. The hormones will therefore be well distributed in the body helping you feel alert and refreshed.The inversion table is therefore very useful in our lives as it will help us in countless ways. It’s efficient and time saving too.