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Open AccessArticle

Muscle-Specific Endurance of the Lower Back Erectors Using Electrical Twitch Mechanomyography

1
Department of Kinesiology, University of Georgia, Athens, GA 30602, USA
2
AU-UGA Medical Partnership, Athens, GA 30606, USA
*
Author to whom correspondence should be addressed.
J. Funct. Morphol. Kinesiol. 2019, 4(1), 12; https://doi.org/10.3390/jfmk4010012
Received: 21 December 2018 / Revised: 22 January 2019 / Accepted: 23 January 2019 / Published: 27 January 2019
(This article belongs to the Section Musculoskeletal Disorders)
Lower back pain is a common symptom potentially associated with skeletal muscle dysfunction. The purpose of this study was to evaluate endurance in the lower back muscles of healthy participants using accelerometer-based mechanomyography. Methods: Young healthy subjects (N = 7) were tested. Surface electrodes and a tri-axial accelerometer were placed over the erector spinae muscle along the T11–L1 Vertebrae. Stimulation was for 3 min each at 2, 4, and 6 Hz, and changes in acceleration were used to calculate an endurance index (EI). Reproducibility of the endurance index measurements was tested on two separate days. Wrist flexor and vastus lateralis muscles were tested for comparison. Near Infrared Spectroscopy (NIRS) was used to measure muscle oxygen levels (O2Hb) (N = 5). EI was 70.3 + 13.4, 32.6 + 8.4, and 19.2 + 6.2% for 2, 4, 6 Hz, respectively. The coefficients of variation were 9.8, 13.9, and 20.3% for 2, 4, 6 Hz, respectively. EI values were lower in the erector spinae muscles compared to the arm and the leg (p < 0.05). O2Hb values were 86.4 + 10.9% at rest and were 77.2 + 15.5, 84.3 + 14.1, and 84.1 + 18.9% for 2, 4, 6 Hz, respectively (p > 0.05, all comparisons). An endurance index can be obtained from the lower back erectors muscles that is reproducible and not influenced by voluntary effort or muscle oxygen levels. View Full-Text
Keywords: muscle fatigue; fatigability; neuromuscular electrical stimulation; humans; near infrared spectroscopy; reproducibility muscle fatigue; fatigability; neuromuscular electrical stimulation; humans; near infrared spectroscopy; reproducibility
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McCully, K.K.; Moraes, C.; Patel, S.V.; Green, M.; Willingham, T.B. Muscle-Specific Endurance of the Lower Back Erectors Using Electrical Twitch Mechanomyography. J. Funct. Morphol. Kinesiol. 2019, 4, 12.

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