Abstract
Introduction: This study evaluates the complexity of force and surface electromyography (sEMG) during knee extension and flexion at low-level isometric contractions in individuals with different degrees of diabetic peripheral neuropathy (DPN). Methods: Ten control and 38 diabetic participants performed isometric contractions at 10%, 20%, and 30% of maximal voluntary contraction. Knee force and multichannel sEMG from vastus lateralis (VL) and biceps femoris were acquired. The SD of force and sample entropy (SaEn) of both force and sEMG were computed. Results: Participants with moderate DPN demonstrated high force-SD and low force-SaEn. Severely affected participants showed low SaEn in VL at all force levels. Discussion: DPN affects the complexity of the neuromuscular system at the knee for the extension task during low-level isometric contractions, with participants in the later stages of the disease (moderate and severe) demonstrating most of the changes. Muscle Nerve 57: 112–121, 2018.
Original language | English |
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Journal | Muscle & Nerve |
Volume | 57 |
Issue number | 1 |
Pages (from-to) | 112-121 |
Number of pages | 10 |
ISSN | 0148-639X |
DOIs | |
Publication status | Published - 2018 |
Keywords
- Journal Article
- complexity
- surface electromyography
- high-density EMG
- motor variability
- sample entropy
- diabetes mellitus
- force
- Muscle, Skeletal/innervation
- Humans
- Middle Aged
- Male
- Quadriceps Muscle/innervation
- Knee Joint/innervation
- Knee/innervation
- Adult
- Female
- Isometric Contraction
- Aged
- Diabetic Neuropathies/physiopathology
- Electromyography