Publication date: Jun 26, 2025
This study examined differences in the spatial distribution of lumbar erector spinae (LES) muscle activity during a submaximal isometric trunk extension contraction between older and younger adults. Thirteen older adults (OLDER) and thirteen young adults (YOUNG) participated. High-density surface electromyography signals were recorded from the LES muscle during an isometric trunk extension task at 30% of maximal voluntary isometric force until failure. The spatial distribution of muscle activity was assessed via the x and y coordinates of the centroid of the root mean square map. Muscle fibre conduction velocity (MFCV) was calculated as a physiological index of local muscle fatigue. Force steadiness was quantified using the coefficient of variation (CoV) of force. MFCV values significantly decreased during the fatiguing task (p
| Concepts | Keywords |
|---|---|
| Adults | Ageing |
| Electromyography | Erector spinae |
| Fatiguing | High-density EMG |
| Isometric | Low back |
| Muscle | Muscle fatigue |
Semantics
| Type | Source | Name |
|---|---|---|
| disease | MESH | muscle fatigue |