Analiza mišične aktivnosti in toplotnega odziva stegenske mišice z uporabo EMG in termografije

Založnik, Davorin (author), Geršak, Gregor (mentor), Stanić, Valentina (comentor)

Diplomsko delo se ukvarja z analizo povezave med elektromiografijo (EMG) in termografijo pri spremljanju mišične aktivnosti in toplotnega odziva stegenske mišice quadriceps femoris med vadbo na napravi za izteg kolena. Glavni namen raziskave je bil ugotoviti, ali obstaja povezava med mišično aktivacijo in segrevanjem kože med vadbo. Eksperiment je bil izveden z uporabo površinskega EMG in termografske kamere. Merjene so bile serije 15 iztegov z različno obremenitvijo (70 %, 50 %, 20 %) v takšnem vrstnem redu in iz enkratnega maksimalnega dviga, ki smo ga uporabili kot referenco za izračun obremenitev). Mišična aktivnost je bila analizirana s pomočjo EMG RMS medtem ko so bile temperaturne spremembe beležene kot povprečje na določenem predelu (ROI = 8800 pikslov) na površini kože stegna s termografsko kamero. V teoretičnem delu je podan pregled zgodovine in razvoja EMG, anatomije mišice quadriceps femoris, funkcionalnosti termokamer in metod analize EMG signalov. Eksperimentalni del podrobno opisuje postopek meritev, postavitev elektrod, uporabo programske opreme (AcqKnowledge in FLIR ResearchIR Max) ter interpretacijo rezultatov. Rezultati so pokazali, da z večanjem obremenitve narašča EMG signal. Termografska analiza je potrdila lokalno segrevanje mišice ob dolgotrajnejši mišični aktivnosti, kar kaže na korelacijo med mišičnim naporom in toplotnim odzivom. Ugotovili smo funkcijsko odvisnost EMG od obremenitve (EMG RMS = 0,352 * obremenitev + 0,1083 mV). Funkcijska odvisnost temperature je bila ( T = -0,7353 * obremenitev + 34,216 ℃).

• Language: Slovenian
• Keywords: EMG, quadriceps femoris, termografska kamera, Biopac, površinske elektrode, anatomija, obremenitev
• Work type: Bachelor thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2025
• PID: 20.500.12556/RUL-170000
• Publication date in RUL: 02.07.2025

Secondary language

• Language: English
• Title: Analysis of Muscle Activity and Thermal Response of the Thigh Muscle Using EMG and Thermography

Abstract

This thesis explores the relationship between electromyography (EMG) and thermography in monitoring muscle activity and the thermal response of the quadriceps femoris muscle during exercise on a knee extension machine. The study's main objective was to determine whether there is a correlation between muscle activation and skin heating during exercise. The experiment was conducted using surface EMG and a thermal camera. Sets of 15 knee extensions with varying loads (70%, 50%, 20%) were measured in that order, based on a one-repetition maximum used as a reference to calculate the loads. Muscle activity was analyzed using EMG RMS, while temperature changes were recorded as an average over a specific region of interest (ROI = 8800 pixels) on the skin surface of the thigh using the thermal camera. The theoretical part provides an overview of the history and development of EMG, the anatomy of the quadriceps femoris muscle, the functionality of thermal cameras, and methods of EMG signal analysis. The experimental section details the measurement procedures, electrode placement, software usage (AcqKnowledge and FLIR ResearchIR Max), and interpretation of the results. The results showed that EMG signal amplitude increased with load. Thermographic analysis confirmed local heating of the muscle during prolonged activity, indicating a correlation between muscular effort and thermal response. A functional dependence of EMG on load was established EMG RMS = 0,352 * load + 0,1083 mV. Functional dependence of temperature was established as T = -0,7353 * load + 34,216 ℃.

• Keywords: EMG, quadriceps femoris, thermographic camera, Biopac, surface electrodes, anatomy, load.