A more accurate measure of calories burned: Model interprets leg motion as expended energy

Medical Xpress

February 19, 2026

AI-Generated Deep Dive Summary

Smartwatches and fitness trackers often provide an estimate of calories burned after a workout, but these numbers can be surprisingly inaccurate—some estimates suggest error rates ranging from 30% to 80%. These devices rely on factors like heart rate, wrist motion, height, and weight to calculate energy expenditure, rather than directly measuring the actual energy expended during exercise. This reliance on indirect metrics often leads to significant inaccuracies, leaving users with a flawed understanding of their workout efforts. A new model has emerged that offers a more precise way to measure calories burned by interpreting leg motion as a direct indicator of expended energy. Unlike traditional methods that focus on heart rate and wrist movement, this innovative approach uses data from sensors placed on the legs to track muscle activity and movement patterns during exercise. By analyzing these signals, the model can provide a more accurate estimation of calorie burn based on actual physical exertion rather than generalized assumptions. This advancement is particularly valuable for individuals who rely on fitness trackers to monitor their workouts and maintain healthy habits. The improved accuracy not only helps users better understand their exercise efforts but also encourages more consistent engagement in physical activity. For those aiming to track progress, lose weight, or improve overall health, having a reliable measure of calorie expenditure can make a significant difference in achieving their goals. The potential implications of this technology extend beyond individual use, offering insights for researchers and fitness professionals alike. By providing more accurate data on energy expenditure, this model could enhance the development of personalized workout plans, more effective weight management strategies, and better-informed health interventions. As wearable technology continues to evolve, advancements like these promise to empower users with tools that are both reliable and actionable. In conclusion, while current fitness trackers provide useful estimates, they often fall short in accuracy due

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Originally published on Medical Xpress on 2/19/2026