Modulation of cocontraction control
Out-of-phase practice trials can modulate slow correlated intermuscular oscillations in cocontraction test
We investigated the modulations
of neural strategy that accompany the Improvement of cocontraction control due to practice. Using visual feedback of Biceps and Triceps EMG signals to improve co-contraction. Three groups, 20 subjects each, were tested before and after different intervention practices. |
Signals grand average during cocontraction practice. Target level VL-even (left column), and target level VL-odd (right column) across trials in 20 subjects: Top 2 rows, time series data (top: BB, bottom: TB; time1: 1st half of trials, time2: 2nd half of trials); Rows 3&4, amplitude coherence between BB and TB first (1st-8th trials) and second half (9th-16th trials) for each target level of practice sessions; Similarly, rows 5&6 show phase coherence corresponding to rows 3&4. The x-axis is a measure of time between -4 and 32 s. Note how the phase of reference muscle change each cycle from leading/rising(blue) to lagging/falling(red) at frequencies below 2Hz. BB: Biceps; TB: Triceps; VL: Varying Level.
References
Ahmar NE, Shinohara M. Slow Intermuscular Oscillations are Associated with Cocontraction Steadiness.
Medicine & Science in Sports & Exercise 2017 49(9): 1955–1964, doi: 10.1249/MSS.0000000000001302
Ahmar NE Slow Intermuscular Oscillations and strategies to Tango with a Robot.
Doctoral dissertation 2018, Georgia Institute of Technology
Ahmar NE, Shinohara M. Slow Intermuscular Oscillations are Associated with Cocontraction Steadiness.
Medicine & Science in Sports & Exercise 2017 49(9): 1955–1964, doi: 10.1249/MSS.0000000000001302
Ahmar NE Slow Intermuscular Oscillations and strategies to Tango with a Robot.
Doctoral dissertation 2018, Georgia Institute of Technology