Force dynamics and synergist muscle activation in stick insects. The effects of using joint torques as mechanical stimuli

Zill SN, Dallmann CJ, Büschges A, Chaudhry S, Schmitz J (2018)
Journal of Neurophysiology 120(4): 1807-1823.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Zill, Sasha N.; Dallmann, Chris J.; Büschges, Ansgar; Chaudhry, Sumaiya; Schmitz, JosefUniBi
Abstract / Bemerkung
Many sensory systems are tuned to specific parameters of behaviors and have effects that are task-specific. We have studied how force feedback contributes to activation of synergist muscles in serially homologous legs of stick insects. Forces were applied using conventional half sine or ramp and hold functions. We also utilized waveforms of joint torques calculated from experiments in freely walking animals. In all legs, forces applied to either the tarsus (foot) or proximal leg segment (trochanter) activated synergist muscles that generate substrate grip and support but coupling of the depressor muscle to tarsal forces was weak in the front legs. Activation of trochanteral receptors using ramp and hold functions generated positive feedback to the depressor muscle in all legs when animals were induced to seek substrate grip. However, discharges of the synergist flexor muscle showed adaptation at moderate force levels. In contrast, application of forces using torque waveforms, which do not have a static hold phase, produced sustained discharges in muscle synergies with little adaptation. Firing frequencies reflected the magnitude of ground reaction forces, were graded to changes in force amplitude and could also be modulated by transient force perturbations added to the waveforms. Comparison of synergist activation by torques and ramp and hold functions revealed a strong influence of force dynamics (dF/dt). These studies support the idea that force receptors can act to synchronously tune muscle synergies to the range of force magnitudes and dynamics that occur in each leg according to their specific use in behaviorMany sensory systems are tuned to specific parameters of behaviors and have effects that are task-specific. We have studied how force feedback contributes to activation of synergist muscles in serially homologous legs of stick insects. Forces were applied using conventional half sine or ramp and hold functions. We also utilized waveforms of joint torques calculated from experiments in freely walking animals. In all legs, forces applied to either the tarsus (foot) or proximal leg segment (trochanter) activated synergist muscles that generate substrate grip and support but coupling of the depressor muscle to tarsal forces was weak in the front legs. Activation of trochanteral receptors using ramp and hold functions generated positive feedback to the depressor muscle in all legs when animals were induced to seek substrate grip. However, discharges of the synergist flexor muscle showed adaptation at moderate force levels. In contrast, application of forces using torque waveforms, which do not have a static hold phase, produced sustained discharges in muscle synergies with little adaptation. Firing frequencies reflected the magnitude of ground reaction forces, were graded to changes in force amplitude and could also be modulated by transient force perturbations added to the waveforms. Comparison of synergist activation by torques and ramp and hold functions revealed a strong influence of force dynamics (dF/dt). These studies support the idea that force receptors can act to synchronously tune muscle synergies to the range of force magnitudes and dynamics that occur in each leg according to their specific use in behavior
Erscheinungsjahr
2018
Zeitschriftentitel
Journal of Neurophysiology
Band
120
Ausgabe
4
Seite(n)
1807-1823
ISSN
0022-3077
eISSN
1522-1598
Page URI
https://pub.uni-bielefeld.de/record/2931605

Zitieren

Zill SN, Dallmann CJ, Büschges A, Chaudhry S, Schmitz J. Force dynamics and synergist muscle activation in stick insects. The effects of using joint torques as mechanical stimuli. Journal of Neurophysiology. 2018;120(4):1807-1823.
Zill, S. N., Dallmann, C. J., Büschges, A., Chaudhry, S., & Schmitz, J. (2018). Force dynamics and synergist muscle activation in stick insects. The effects of using joint torques as mechanical stimuli. Journal of Neurophysiology, 120(4), 1807-1823. doi:10.1152/jn.00371.2018
Zill, S. N., Dallmann, C. J., Büschges, A., Chaudhry, S., and Schmitz, J. (2018). Force dynamics and synergist muscle activation in stick insects. The effects of using joint torques as mechanical stimuli. Journal of Neurophysiology 120, 1807-1823.
Zill, S.N., et al., 2018. Force dynamics and synergist muscle activation in stick insects. The effects of using joint torques as mechanical stimuli. Journal of Neurophysiology, 120(4), p 1807-1823.
S.N. Zill, et al., “Force dynamics and synergist muscle activation in stick insects. The effects of using joint torques as mechanical stimuli”, Journal of Neurophysiology, vol. 120, 2018, pp. 1807-1823.
Zill, S.N., Dallmann, C.J., Büschges, A., Chaudhry, S., Schmitz, J.: Force dynamics and synergist muscle activation in stick insects. The effects of using joint torques as mechanical stimuli. Journal of Neurophysiology. 120, 1807-1823 (2018).
Zill, Sasha N., Dallmann, Chris J., Büschges, Ansgar, Chaudhry, Sumaiya, and Schmitz, Josef. “Force dynamics and synergist muscle activation in stick insects. The effects of using joint torques as mechanical stimuli”. Journal of Neurophysiology 120.4 (2018): 1807-1823.

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