On the efficacy of coherence-based assessment of functional coupling between pools of motor unitsKutoš, Leon (Avtor) Kalc, Miloš (Avtor) Kramberger, Matej (Avtor) Urh, Filip (Avtor) Holobar, Aleš (Avtor) high-density surface electromyographymotor unitcoherenceactivity indexbiceps brachiigastrocnemius lateralisgastrocnemius medialiscumulative spike trainWe studied the impact of the extension of the convolutive data model of high-density electromyograms (hdEMG) on the accuracy of coherence estimation between the motor unit (MU) activity indices (AI) calculated from different heads of biceps brachii (BB) (in simulated conditions) and gastrocnemius lateralis (GL) and medialis (GM) muscle in 5 young, healthy subjects. AI was calculated for each muscle head (simulated conditions) or muscle (experimental conditions). Coherence was calculated on 1 s long epochs of AI and compared to coherence values calculated from amplitude envelops (AE) of hdEMG and Cumulative Spike Trains (CST) calculated from individual MUs as identified by decomposition of hdEMG. Coherence values in AI (0.98±0.02 in synthetic and 0.49±0.20 in experimental conditions) were significantly higher than in the AE (0.89±0.07 in synthetic and 0.23 ± 0.15 in experimental conditions) and CST (0.83±0.11 in synthetic and 0.20 ± 0.10 in experimental conditions). The optimal extension factors were relatively high (>80), especially when compared to those for hdEMG decomposition (typically around 15). The reasons for this are not yet fully known and need further investigation.20242026-02-23 14:25:13Znanstveno delo97205UDK: 004.8OceCobissID: 209062403COBISS_ID: 210657539sl