After completing your run, you glance at your smartwatch. Your fitness score has dropped significantly. It indicates you’ve hardly burned any calories. Your recovery score is quite low. It suggests that you should refrain from exercising for the next 72 hours.
The most frustrating part? That entire run felt fantastic.
So, why is your device giving you such contradicting information?
The main reason is that smartwatches and similar fitness trackers can lack precision.
Smartwatches influence perceptions of fitness
For nearly ten years, wearable fitness devices like smartwatches have been among the leading trends in health and fitness. Countless individuals across the globe use them on a daily basis.
These gadgets influence how people perceive health and fitness. They provide information about calories burned, fitness levels, recovery status after workouts, and readiness for additional exercise.
Nonetheless, most of these metrics are not measured directly by your smartwatch. Instead, many standard metrics are based on estimations. In other words, their precision may not be as high as you assume.
1. Calories burned
Tracking calories is one of the most sought-after features in smartwatches. However, the reliability of this feature can be quite poor.
Wearable devices may either underestimate or overestimate energy expenditure (commonly referred to as calories burned) by over 20 percent. These inaccuracies can also differ across various activities. For instance, activities like weight lifting, cycling, and high-intensity interval training could yield even greater discrepancies.
This is important since many individuals depend on these figures to determine their food intake.
For instance, if your smartwatch overreports calories burned, you might believe you need to consume more food than necessary, potentially leading to weight gain. On the flip side, if it underreports calories burned, this could result in insufficient food intake, adversely affecting your exercise performance.
2. Step counts
Step counting serves as a useful tool for gauging general physical activity, but wearables don’t capture this data flawlessly.
Smartwatches tend to underestimate steps by approximately 10 percent under typical exercise conditions. Activities such as pushing a stroller, lifting weights, or walking with restricted arm movement can make step counts less accurate since smartwatches track arm movement to count steps.
For many, this isn't a significant issue, and step counts are still beneficial for monitoring general activity levels. However, they should be viewed as approximations rather than exact figures.
3. Heart rate
Smartwatches assess your heart rate utilizing sensors that detect fluctuations in blood flow through your wrist’s veins.
This approach works well at rest or during low-intensity activities, but the accuracy diminishes as exercise intensity rises.
Factors such as arm movement, perspiration, skin pigmentation, and how snugly the watch is fitted can also affect the heart rate readings. Consequently, accuracy can vary from person to person.
This variability can pose problems for individuals relying on heart rate zones to direct their training, as small inaccuracies can lead to exercising at inappropriate intensity levels.
4. Sleep tracking
Nearly all smartwatches available today provide a “sleep score” and categorize your sleep into phases of light, deep, and REM sleep.
The most reliable method for assessing sleep is polysomnography. This test is conducted in a laboratory and monitors brain function. However, smartwatches gauge sleep patterns through movement and heart rate data.
As a result, they can reasonably determine when you are asleep or awake, but they are less precise in distinguishing between different sleep stages.
Thus, even if your device indicates you had “poor deep sleep,” it may not accurately reflect your true sleep quality.
5. Recovery scores
The majority of smartwatches monitor heart rate variability and combine this with your sleep score to generate a “readiness” or “recovery” score.
Heart rate variability shows how your body reacts to stress, and in laboratories, it is assessed using an electrocardiogram. Yet, smartwatches derive it from wrist sensors, which can often miscalculate the readings.
This means that many recovery indicators depend on two unreliable metrics (sleep quality and heart rate variability), which results in a measurement that might not truly indicate your recovery status.
Consequently, if your device suggests you are not adequately recovered, you might forgo training – even when you feel ready (and are truly prepared).
6. VO₂max
Many devices provide an estimation of your VO₂max, representing your peak fitness level. It signifies the highest amount of oxygen your body can consume during physical activity.
The most accurate way to measure VO₂max requires wearing a mask to evaluate the oxygen inhaled and exhaled, determining your oxygen utilization for energy production.
However, your watch cannot directly assess oxygen consumption. It approximates it based on your heart rate and physical activity.
Smartwatches typically inflate VO₂max estimates for individuals with lower activity levels and undervalue it for those who are more fit.
As a result, the figure displayed on your watch may not accurately reflect your genuine fitness level.
What actions should you take?
While the information collected by your smartwatch can be unreliable, it is not entirely without merit. These gadgets can still assist you in monitoring general trends over time, but daily variations or exact figures should be disregarded.
Moreover, it is crucial to focus on your feelings, performance, and recovery, as this will likely provide greater insights than solely relying on what your smartwatch indicates.
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