New Study Reveals Smartwatches Overestimate Calories Burned for Users
A recent investigation by researchers at Florida International University (FIU) brings to light the troubling inaccuracies often found in smartwatch calorie-burn estimates. This extensive study analyzed four prominent fitness trackers — the Apple Watch Series 8, Fitbit Sense 2, Samsung Galaxy Watch 5, and Garmin Forerunner 955 — using clinical-grade equipment to evaluate their calorie-burning calculations.
The findings showed that these smartwatches frequently overestimate the actual calories burned during physical exertion. On average, discrepancies ranged from 15% to 25%, with certain devices showing even larger variances. For instance, if a smartwatch reports that a user has burned 500 calories during a workout, the reality might be closer to 350 calories. This degree of overestimation can significantly affect weight management efforts for individuals relying on these devices to guide their diets and exercise regimens.
The study's lead author, Associate Professor Jason Kostrna, emphasized the implications of these errors, noting that they could lead users to believe they are in a calorie deficit when, in fact, they are consuming more than needed. The research involved 58 participants cycling on stationary bikes while wearing these smartwatches, with their actual energy expenditure measured by a COSMED K5 metabolic analyzer, which is widely regarded as a gold standard in clinical analysis.
Among the devices tested, the Apple Watch was found to be the most accurate, while the Garmin and Samsung models were noted to overestimate calories the most. Unfortunately, Fitbit's performance was somewhat erratic, displaying glitched data throughout the study, with some reports indicating implausibly low numbers or even failures to record metrics entirely. This inconsistency has led researchers to filter out many of the invalid readings generated by the Fitbit. Kostrna expressed that the root cause of the inaccuracies—especially for individuals with higher body fat percentages—remains uncertain. He speculates that the algorithms used by these devices to estimate calorie burn could be a contributing factor.
He stated, "When these companies are developing their algorithms, the origins of the test data they use remain unclear. This makes it vital for them to be aware of such research findings to improve their products further."
Notably, Kostrna is conducting continuing research on smartwatch calorie estimates during traditional strength training, which could yield further insights into the devices' performance.
While acknowledging the challenges presented by smartwatches in providing accurate calorie counts, Kostrna encourages users to leverage the devices wisely. He suggests that calorie-burn figures should be viewed more as upper thresholds rather than precise measurements. Users should consider adjusting estimates by rounding down to maintain a conservative approach to calorie tracking. As the study indicated that accuracy declines with higher body fat percentages, it is advisable for those using smartwatches for weight management to factor in a margin of error when making dietary decisions.
Experts caution against a drastic reduction in food intake as a compensatory mechanism for the calorie discrepancies. The body requires adequate nutrition to support recovery and sustain consistent training efforts.
Instead of fixating solely on calories burned in a particular workout, users are encouraged to focus on metrics that wearables typically assess with greater accuracy, such as heart rate or time spent in various heart rate zones. Tracking personal performance trends over time can be a more constructive approach than obsessing over daily calorie totals.
In conclusion, while smartwatches serve as helpful tools for fitness tracking, users must remain mindful of their limitations. Regularly monitoring personal progress and using the data to make informed decisions can enhance overall fitness without becoming overwhelmed by numbers. As Kostrna wisely notes, "If tracking your fitness proves beneficial, enjoy the process. However, if it feels burdensome, consider stepping back and reconnecting with your body's sensations. Utilize data to improve gradually."
The findings showed that these smartwatches frequently overestimate the actual calories burned during physical exertion. On average, discrepancies ranged from 15% to 25%, with certain devices showing even larger variances. For instance, if a smartwatch reports that a user has burned 500 calories during a workout, the reality might be closer to 350 calories. This degree of overestimation can significantly affect weight management efforts for individuals relying on these devices to guide their diets and exercise regimens.
The study's lead author, Associate Professor Jason Kostrna, emphasized the implications of these errors, noting that they could lead users to believe they are in a calorie deficit when, in fact, they are consuming more than needed. The research involved 58 participants cycling on stationary bikes while wearing these smartwatches, with their actual energy expenditure measured by a COSMED K5 metabolic analyzer, which is widely regarded as a gold standard in clinical analysis.
Among the devices tested, the Apple Watch was found to be the most accurate, while the Garmin and Samsung models were noted to overestimate calories the most. Unfortunately, Fitbit's performance was somewhat erratic, displaying glitched data throughout the study, with some reports indicating implausibly low numbers or even failures to record metrics entirely. This inconsistency has led researchers to filter out many of the invalid readings generated by the Fitbit. Kostrna expressed that the root cause of the inaccuracies—especially for individuals with higher body fat percentages—remains uncertain. He speculates that the algorithms used by these devices to estimate calorie burn could be a contributing factor.
He stated, "When these companies are developing their algorithms, the origins of the test data they use remain unclear. This makes it vital for them to be aware of such research findings to improve their products further."
Notably, Kostrna is conducting continuing research on smartwatch calorie estimates during traditional strength training, which could yield further insights into the devices' performance.
While acknowledging the challenges presented by smartwatches in providing accurate calorie counts, Kostrna encourages users to leverage the devices wisely. He suggests that calorie-burn figures should be viewed more as upper thresholds rather than precise measurements. Users should consider adjusting estimates by rounding down to maintain a conservative approach to calorie tracking. As the study indicated that accuracy declines with higher body fat percentages, it is advisable for those using smartwatches for weight management to factor in a margin of error when making dietary decisions.
Experts caution against a drastic reduction in food intake as a compensatory mechanism for the calorie discrepancies. The body requires adequate nutrition to support recovery and sustain consistent training efforts.
Instead of fixating solely on calories burned in a particular workout, users are encouraged to focus on metrics that wearables typically assess with greater accuracy, such as heart rate or time spent in various heart rate zones. Tracking personal performance trends over time can be a more constructive approach than obsessing over daily calorie totals.
In conclusion, while smartwatches serve as helpful tools for fitness tracking, users must remain mindful of their limitations. Regularly monitoring personal progress and using the data to make informed decisions can enhance overall fitness without becoming overwhelmed by numbers. As Kostrna wisely notes, "If tracking your fitness proves beneficial, enjoy the process. However, if it feels burdensome, consider stepping back and reconnecting with your body's sensations. Utilize data to improve gradually."
Topics Health）
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