Use of the integrated profile for voluntary muscle activity detection using EMG signals with spurious background spikes: A study with incomplete spinal cord injury

2016 ◽  
Vol 24 ◽  
pp. 19-24 ◽  
Author(s):  
Jie Liu ◽  
Qiuping Liu
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Muscle Activity ◽  
Activity Detection ◽  
Incomplete Spinal Cord Injury ◽  
Voluntary Muscle ◽  
Cord Injury

scholarly journals Changes in Locomotor Muscle Activity After Treadmill Training in Subjects With Incomplete Spinal Cord Injury

2009 ◽  
Vol 101 (2) ◽  
pp. 969-979 ◽  
Author(s):  
Monica A. Gorassini ◽  
Jonathan A. Norton ◽  
Jennifer Nevett-Duchcherer ◽  
Francois D. Roy ◽  
Jaynie F. Yang
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Muscle Activity ◽  
Muscle Activation ◽  
Treadmill Training ◽  
Emg Activity ◽  
Incomplete Spinal Cord Injury ◽  
Activation Patterns ◽  
Muscle Activation Patterns ◽  
Cord Injury

Intensive treadmill training after incomplete spinal cord injury can improve functional walking abilities. To determine the changes in muscle activation patterns that are associated with improvements in walking, we measured the electromyography (EMG) of leg muscles in 17 individuals with incomplete spinal cord injury during similar walking conditions both before and after training. Specific differences were observed between subjects that eventually gained functional improvements in overground walking (responders), compared with subjects where treadmill training was ineffective (nonresponders). Although both groups developed a more regular and less clonic EMG pattern on the treadmill, it was only the tibialis anterior and hamstring muscles in the responders that displayed increases in EMG activation. Likewise, only the responders demonstrated decreases in burst duration and cocontraction of proximal (hamstrings and quadriceps) muscle activity. Surprisingly, the proximal muscle activity in the responders, unlike nonresponders, was three- to fourfold greater than that in uninjured control subjects walking at similar speeds and level of body weight support, suggesting that the ability to modify muscle activation patterns after injury may predict the ability of subjects to further compensate in response to motor training. In summary, increases in the amount and decreases in the duration of EMG activity of specific muscles are associated with functional recovery of walking skills after treadmill training in subjects that are able to modify muscle activity patterns following incomplete spinal cord injury.

Innervation and Properties of the Rat FDSBQ Muscle: An Animal Model to Evaluate Voluntary Muscle Strength after Incomplete Spinal Cord Injury

1999 ◽  
Vol 158 (2) ◽  
pp. 279-289 ◽  
Author(s):  
Christine K. Thomas ◽  
Vladimir Esipenko ◽  
Xiao Ming Xu ◽  
Parley W. Madsen ◽  
Tessa Gordon
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Animal Model ◽  
Muscle Strength ◽  
Incomplete Spinal Cord Injury ◽  
Voluntary Muscle ◽  
Cord Injury

scholarly journals Changes in motoneuron excitability during voluntary muscle activity in humans with spinal cord injury

2020 ◽  
Vol 123 (2) ◽  
pp. 454-461 ◽  
Author(s):  
Roberta Vastano ◽  
Monica A. Perez
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Electrical Stimulation ◽  
Muscle Activity ◽  
Voluntary Contraction ◽  
Voluntary Activity ◽  
Voluntary Muscle ◽  
Motoneuron Excitability ◽  
Cord Injury ◽  
F Wave

The excitability of resting motoneurons increases following spinal cord injury (SCI). The extent to which motoneuron excitability changes during voluntary muscle activity in humans with SCI, however, remains poorly understood. To address this question, we measured F waves by using supramaximal electrical stimulation of the ulnar nerve at the wrist and cervicomedullary motor-evoked potentials (CMEPs) by using high-current electrical stimulation over the cervicomedullary junction in the first dorsal interosseous muscle at rest and during 5 and 30% of maximal voluntary contraction into index finger abduction in individuals with chronic cervical incomplete SCI and aged-matched control participants. We found higher persistence (number of F waves present in each set) and amplitude of F waves at rest in SCI compared with control participants. With increasing levels of voluntary contraction, the amplitude, but not the persistence, of F waves increased in both groups but to a lesser extent in SCI compared with control participants. Similarly, the CMEP amplitude increased in both groups but to a lesser extent in SCI compared with controls. These results were also found at matched absolutely levels of electromyographic activity, suggesting that these changes were not related to decreases in voluntary motor output after SCI. F-wave and CMEP amplitudes were positively correlated across conditions in both groups. These results support the hypothesis that the responsiveness of the motoneuron pool during voluntary activity decreases following SCI, which could alter the generation and strength of voluntary muscle contractions. NEW & NOTEWORTHY How the excitability of motoneurons changes during voluntary muscle activity in humans with spinal cord injury (SCI) remains poorly understood. We found that F-wave and cervicomedullary motor-evoked potential amplitude, outcomes reflecting motoneuronal excitability, increased during voluntary activity compared with rest in SCI participants but to a lesser extent that in controls. These results suggest that the responsiveness of motoneurons during voluntary activity decreases following SCI, which might affect functionally relevant plasticity after the injury.

scholarly journals Energy expenditure and muscle activity during lying, sitting, standing, and walking in people with motor-incomplete spinal cord injury

Spinal Cord ◽  
2018 ◽  
Vol 56 (10) ◽  
pp. 1008-1016 ◽  
Author(s):  
Bart Dekker ◽  
Olaf Verschuren ◽  
Astrid C. J. Balemans ◽  
Nadia Baart ◽  
Frank Tubbing ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Energy Expenditure ◽  
Muscle Activity ◽  
Incomplete Spinal Cord Injury ◽  
Cord Injury
Sign in / Sign up

Export Citation Format

Share Document