Fuentes del Toro, SergioWei, YuyangOlmeda Santamaría, EsterRen, LeiGuowu, WeiDíaz López, Vicente2021-05-282021-05-282019-01Fuentes del Toro, S., Wei, Y., Olmeda, E., Ren, L., Guowu, W., & Díaz, V. (2019). Validation of a Low-Cost Electromyography (EMG) System via a Commercial and Accurate EMG Device: Pilot Study. Sensors, 19(23), 5214.1424-8220https://hdl.handle.net/10016/32799Electromyography (Emg) Devices Are Well-Suited For Measuring The Behaviour Of Muscles During An Exercise Or A Task, And Are Widely Used In Many Different Research Areas. Their Disadvantage Is That Commercial Systems Are Expensive. We Designed A Low-Cost Emg System With Enough Accuracy And Reliability To Be Used In A Wide Range Of Possible Ways. The Present Article Focuses On The Validation Of The Low-Cost System We Designed, Which Is Compared With A Commercially Available, Accurate Device. The Evaluation Was Done By Means Of A Set Of Experiments, In Which Volunteers Performed Isometric And Dynamic Exercises While Emg Signals From The Rectus Femoris Muscle Were Registered By Both The Proposed Low-Cost System And A Commercial System Simultaneously. Analysis And Assessment Of Three Indicators To Estimate The Similarity Between Both Signals Were Developed. These Indicated A Very Good Result, With Spearman&#39 S Correlation Averaging Above 0.60, The Energy Ratio Close To The 80% And The Linear Correlation Coefficient Approximating 100%. The Agreement Between Both Systems (Custom And Commercial) Is Excellent, Although There Are Also Some Limitations, Such As The Delay Of The Signal (&Lt 1 S) And Noise Due To The Hardware And Assembly In The Proposed System.16eng© 2019 by the authorsAtribución 3.0 EspañaElectromyographyLow-Cost sensorsValidationresearch articleIngeniería Mecánicahttps://doi.org/10.3390/s19235214open access123, 521416Sensors19AR/0000024413