Electromyographic Analysis of the Lumbar Extensor Muscles during Dynamic Exercise on a Home Exercise Device

Abstract

Resistance exercise with devices offering mechanisms to isolate the lumbar spine is effective to improve muscle strength and clinical outcomes. However, previously assessed devices with these mechanisms are not conducive for home exercise programs. The purpose of this study was to assess the surface electromyographic (EMG) activity of the lumbar extensor muscles during dynamic exercise on a home back extension exercise device. Ten adults (5 F, 5 M) performed dynamic lumbar extension exercise on a home device at three loads: 1.00 × body weight (BW), 1.25 × BW and 1.50 × BW. Surface EMG activity from the L3/4 paraspinal region was collected. The effect of exercise load, phase of movement, and position in the range of motion on lumbar extensor EMG activity (normalized to % maximum voluntary isometric contraction) was assessed. Lumbar extensor EMG activity significantly increased from 1.00 BW to 1.50 BW loads (p = 0.0006), eccentric to concentric phases (p < 0.0001), and flexion to extension positions (p < 0.0001). Exercise using a home back extension exercise device progressively activates the lumbar extensor muscles. This device can be used for home-based resistance exercise programs in community-dwelling adults without contraindications.

The Application of Surface Electromyography Technology in Evaluating Paraspinal Muscle Function

“…The versatility of sEMG allows for the assessment of paraspinal muscle activity during various tasks, such as static postures, dynamic movements, and specific exercises, facilitating a comprehensive understanding of their role in daily activities and pathological conditions. In recent years, the application of sEMG has gained significant traction, shedding light on various musculoskeletal conditions, optimizing sports performance, and guiding rehabilitation strategies [ 18 , 29 , 30 , 31 , 32 , 33 , 34 ]. We conducted a search on PubMed for relevant literature regarding the application of surface electromyography (sEMG) in assessing paraspinal muscles.…”

Exercise Evaluation and Prescription—Second Edition

“…Mayer et al [ 40 ] assessed the surface electromyographic activity of the lumbar extensor muscles during full-range-of-motion, dynamic exercise on a home back extension exercise device at three exercise loads. They concluded that dynamic exercise on a home back extension exercise device is safe and provides a mechanism to progressively activate the lumbar extensor muscles.…”