The Study Of Muscle Fatigue On Wrist And Lower Back In Gym Activities Using Electromyography (EMG)

Lin, Wei Lin (2018) The Study Of Muscle Fatigue On Wrist And Lower Back In Gym Activities Using Electromyography (EMG). Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Surface Electromyography (sEMG) is a measure of the electrical potential caused by muscle contraction through the human skin. It also allows the study of dynamic muscle activity, which can apply to bio-mechanical motion analysis, muscle fatigue research, sport or exercise performance and application in work medicine and ergonomics. Nowadays, weight training is one of the most popular exercise in the gym. Weight training can be divided into three categories, which are free weight, body weight and machine weight. However, wrist pain and lower back pain are the common problem for the weight-related exercises. What types of weight training will cause more muscle fatigue on the wrist and lower back muscles? Does the BMI category and gender also affect muscle fatigue during weight lifting exercises? The objective of this study is to determine, analyze and compare the muscle fatigue on the wrist and lower back in the push-up, barbell bench press and Smith machine bench press exercises at the gym. The EMG signals were collected from the wrist (extensor carpi ulnaris muscles, ECU) and lower back (multifidus muscles). There are 9 resistance-trained males and 9 resistance-trained females are volunteer for this study. Every participant was required to perform the push-up, barbell bench press, and Smith machine bench press exercises orderly at the UTeM gym. Participants must are in the ready posture before the EMG signals began to record using DELSYS® Trigno & EMGworks equipment. Ten repetitions (10 RM) occurred for each exercise at the same rate. A minimum of 3 minutes of rest occurred between exercises for each participant. Next, the collected EMG signal will be analyzed using DELSYS® EMGworks software. The root mean square (RMS) is the time domain that used in feature extraction. The extracted feature will be displayed in the bar chart form at the end of the study. Furthermore, the comparisons among three different types of weightlifting exercise, genders and subject BMI category for both extensor carpi ulnaris (ECU) and multifidus muscles also will be discussed in this study. As overall results, the underweight and normal weight subjects have the highest risk of fatigue on ECU and multifidus muscles in the free-weight bench press exercise; the lowest risk of fatigue on ECU and multifidus muscles in the bodyweight push-up exercise. While, the over weight subjects have the highest risk of fatigue on ECU and multifidus muscles in the body-weight push-up exercise; the lowest risk of fatigue on ECU and multifidus muscles in the Machined-weight bench press exercise.

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