Soleus H-reflex modulation in response to change in percentage of leg loading in standing after incomplete spinal cord injury
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Acknowledgements
NIH KO1 HD01348, VA RR & D grant F2182C.
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Cited by (21)
Limb compressive load does not inhibit post activation depression of soleus H-reflex in indiviudals with chronic spinal cord injury
2013, Clinical NeurophysiologyCitation Excerpt :Early mechanical loading interventions via muscle contractions have successfully prevented the loss of bone, loss of muscle mass, and changes in spinal excitability in individuals with SCI (Shields et al., 2006, 2011; Shields and Dudley-Javoroski, 2006; Dudley-Javoroski and Shields, 2008a,b; Adams et al., 2011; Dudley-Javoroski et al., 2012). In healthy humans, limb load is believed to trigger sensory inputs that control body dynamics during both static standing and walking via adaptations to spinal circuitry (Andersen and Sinkjaer, 1999; Petersen et al., 1999; Trimble et al., 2001; Faist et al., 2006; Phadke et al., 2006; Huang et al., 2009; Knikou et al., 2009a,b). In this study we explore the impact of passive segment compressive load on spinal circuitry in people with chronic and complete SCI.
What triggers the continuous muscle activity during upright standing?
2013, Gait and PostureCitation Excerpt :Load receptors including cutaneous mechanoreceptors of the foot sole as well as joint proprioceptive sensors of the joint have been hypothesized to provide key sensory inputs. In addition, the effect of the vertical load on the motor unit excitability has been intensively investigated [5–11], but is not conclusive. It has, however, been established that cutaneous mechanoreceptor inputs induce postural responses [12–14], making a considerable contribution to postural balance [15–18].
Limb segment load inhibits post activation depression of soleus H-reflex in humans
2012, Clinical NeurophysiologyCitation Excerpt :It is known that the excitability of motor neurons is influenced by central set, characterized as the “preparatory set” within the central nervous system before execution of a motor act (Frank, 1986; Meunier and Pierrot-Deseilligny, 1989; Leis et al., 1995). The central set is affected by many factors such as environmental noise (Delwaide and Schepens, 1995; Kolev and Milanov, 1995), the level of arousal and anxiety(Ribot-Ciscar et al., 2000; Rossi-Durand, 2002; Sibley et al., 2007), body position (Hayashi et al., 1992; Mynark and Koceja, 1997; Phadke et al., 2006), and sensory inputs (Iles and Pisini, 1992b; Hoffman and Koceja, 1995; Iles, 1996; Knikou, 2007; Conway and Knikou, 2008). To minimize the influence from supra spinal and vestibular systems on motor neuron excitability, subjects were instructed to relax and sit quietly throughout the entire experiment.
The effects of body weight on the soleus H-reflex modulation during standing
2011, Journal of Electromyography and KinesiologyCitation Excerpt :These situations included asymmetrical standing on two body scales or force plates using feedback (Hwang et al., 2004), different-gravity conditions including microgravity, normal gravity, and hyper-gravity (Miyoshi et al., 2003), different joint loading on a waterproof force platform in the water tank (Nakazawa et al., 2004), or suspension system composed of an overhead I-beam and support harness (Field-Fote et al., 2000; Phadke et al., 2006). Although we chose a suspension system that corresponded to the methods described by Phadke et al. (2006), they could not find statistical significance across BWL conditions nevertheless there was a similar tendency to our results. Limited sample size (n = 5) is a possible explanation for the differences between our study and the Phadke et al.
Comparison of Soleus H-Reflex Modulation After Incomplete Spinal Cord Injury in 2 Walking Environments: Treadmill With Body Weight Support and Overground
2007, Archives of Physical Medicine and Rehabilitation