Changes in Human Muscle Spindle Sensitivity during a Proprioceptive Attention Task

Hospod, Valérie; Aimonetti, Jean Marc; Roll, J. P.; Ribot-Ciscar, Édith

doi:10.1523/jneurosci.0572-07.2007

Cited by 85 publications

(74 citation statements)

References 33 publications

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“…Conversely, in the case in which muscle feedback is given importance, as during the performance of an attention task that relies only on proprioceptive cues, it may be enhanced. More precisely, we recently showed that the fusimotor control of human muscle spindle sensitivity changes when subjects' attention is directed to the recognition of imposed two-dimensional movements in the form of written symbols (Hospod et al 2007). Here again the observed effects seemed to agree with what could be expected for the muscle spindle feedback to be adapted to the ongoing task.…”

supporting

confidence: 58%

“…Later we showed that this ␥-induced activity expressed itself at the level of muscle spindles by selectively changing their sensitivity to movements . Finally, we suggested that the fusimotor drive might be adapted to the ongoing task (Hospod et al 2007). Indeed when the subject is asked to focus attention on an imposed two-dimensional movement (letter or number) to name it, the primary endings tend to become secondary-like, with a depressed dynamic and an enhanced static sensitivity, as compared with a no-attention situation.…”

Section: Discussionmentioning

confidence: 97%

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Fusimotor Drive May Adjust Muscle Spindle Feedback to Task Requirements in Humans

Ribot-Ciscar¹,

Hospod²,

Roll³

et al. 2009

Journal of Neurophysiology

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Ribot-Ciscar E, Hospod V, Roll JP, Aimonetti JM. Fusimotor drive may adjust muscle spindle feedback to task requirements in humans. J Neurophysiol 101: 633-640, 2009. First published November 26, 2008 doi:10.1152/jn.91041.2008. The aim of the present study was to investigate whether the fusimotor control of muscle spindle sensitivity may depend on the movement parameter the task is focused on, either the velocity or the final position reached. The unitary activities of 18 muscle spindle afferents were recorded by microneurography at the common peroneal nerve. We compared in two situations the responses of muscle spindle afferents to ankle movements imposed while the subject was instructed not to pay attention to or to pay attention to the movement, both in the absence of visual cues. In the two situations, three ramp-and-hold movements were imposed in random order. In one situation, the three movements differed by their velocity and in the other by the final position reached. The task consisted in ranking the three movements according to the parameter under consideration (for example, slow, fast, and medium). The results showed that paying attention to movement velocity gave rise to a significant increase in the dynamic and static responses of muscle afferents. In contrast, focusing attention on the final position reached made the muscle spindle feedback better discriminate the different positions and depressed its capacity to discriminate movement velocities. Changes are interpreted as reflecting dynamic and static gamma activation, respectively. The present results support the view that the fusimotor drive depends on the parameter the task is focused on, so that the muscle afferent feedback is adjusted to the task requirements.

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supporting

confidence: 58%

Section: Discussionmentioning

confidence: 97%

Fusimotor Drive May Adjust Muscle Spindle Feedback to Task Requirements in Humans

Ribot-Ciscar¹,

Hospod²,

Roll³

et al. 2009

Journal of Neurophysiology

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“…We found that target-guided contractions produced more 7-9 Hz coherence among MUs than self-guided contractions, which is consistent with the predicted effects of an increase in the magnitude or gain of afferent feedback. Such a change in afferent feedback and/or fusimotor activity might have stemmed from changes in the cognitive aspects of the task (Hospod et al 2007;Ribot et al 1986;Ribot-Ciscar et al 2000, changes in sympathetic drive (Abila et al 1985), or the change in force dynamics associated with error correction (Marsden et al 1970). Our results suggest that the absence/ presence of a target underlies changes in tremor previously associated with the general absence/presence of visual feedback.…”

Section: Discussionmentioning

confidence: 63%

Neural correlates of task-related changes in physiological tremor

Laine

Negro

Farina

2013

Journal of Neurophysiology

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Laine CM, Negro F, Farina D. Neural correlates of task-related changes in physiological tremor. J Neurophysiol 110: 170 -176, 2013. First published April 17, 2013 doi:10.1152/jn.00041.2013.-Appropriate control of muscle contraction requires integration of command signals with sensory feedback. Sensorimotor integration is often studied under conditions in which muscle force is controlled with visual feedback. While it is known that alteration of visual feedback can influence task performance, the underlying changes in neural drive to the muscles are not well understood. In this study, we characterize the frequency content of force fluctuations and neural drive when production of muscle force is target guided versus self guided. In the self-guided condition, subjects performed isometric contractions of the first dorsal interosseous (FDI) muscle while slowly and randomly varying their force level. Subjects received visual feedback of their own force in order to keep contractions between 6% and 10% of maximum voluntary contraction (MVC). In the targetguided condition, subjects used a display of their previously generated force as a target to track over time. During target tracking, force tremor increased significantly in the 3-5 and 7-9 Hz ranges, compared with self-guided contractions. The underlying changes in neural drive were assessed by coherence analysis of FDI motor unit activity. During target-guided force production, pairs of simultaneously recorded motor units showed less coherent activity in the 3-5 Hz frequency range but greater coherence in the 7-9 Hz range than in the self-guided contractions. These results show that the frequency content of common synaptic input to motoneurons is altered when force production is visually guided. We propose that a change in stretchreflex gain could provide a potential mechanism for the observed changes in force tremor and motor unit coherence.

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“…Thus, muscle spindle sensitivity may be affected peripherally (due to thixotropy) and via central nervous system control. 22 Clinically, proprioceptive loss has received considerable attention, particularly in relation to lower-quarter injury, and has been studied most extensively in individuals with anterior cruciate ligament rupture 2,30 and knee osteoarthritis. 4,20,33 Proprioceptive deficits in TDPM have been linked to functional deficiencies, including giving way, 5,31 which has been attributed to knee proprioceptive receptor damage, a sequela of joint injury.…”

Section: T T Resultsmentioning

confidence: 99%

“…Fundamental to this training effect is the increased attention to the task, which is believed to affect muscle spindle sensitivity. 22 Fitzgerald et al 13 developed a training program to promote joint stability in populations with knee pathologies, in which subjects were required to maintain stability following unexpected perturbations. Their findings demonstrated better functional outcomes in a group of subjects with an anterior cruciate ligament-deficient knee following a stint of perturbation training; however, proprioceptive acuity measures were not reported.…”

mentioning

confidence: 99%

Enhanced Proprioceptive Acuity at the Knee in the Competitive Athlete

Courtney¹,

Rine²,

Jenk³

et al. 2013

Journal of Orthopaedic & Sports Physical Therapy

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Study Design Controlled laboratory study: cross-sectional. Objective To determine if proprioception, measured by the threshold to detection of passive motion (TDPM), differed in individuals who regularly participate in moderate-intensity exercise for fitness as compared to individuals involved in high-intensity skilled exercise. Background Previous research has been equivocal as to whether exercise training is associated with superior proprioceptive acuity, in particular, exercise that includes dynamic postural challenges such as cutting and pivoting. Methods Two groups of 25 healthy individuals (18–32 years old) were recruited. One group consisted of individuals who performed moderate-activity level exercises for 5 to 10 hours per week. Participants in the other group performed high-activity level exercises, including high-speed cutting and pivoting activities, at least 10 hours per week. Proprioception was determined using TDPM, in which the knee was slowly extended or flexed at an angular velocity of 0.5°/s or less from a starting position of 40° of knee flexion. Results Individuals participating in competitive, high-intensity skilled exercise demonstrated better acuity (average of both limbs) of TDPM (mean ± SD, 0.81° ± 0.38°; P<.001) than those participating in moderate-intensity exercise for fitness (1.53° ± 0.58°). A low but statistically significant association (r = −0.38, P = .006) was found between weekly duration of exercise and proprioceptive threshold as measured by TDPM. Conclusion These results suggest that perceptual thresholds of passive movement may be enhanced, depending on activity level and associated postural challenge, and that higher level and increased amount of exercise may promote enhanced neurosensory processing in these individuals. Consequently, high-intensity skilled training may deserve further emphasis in orthopaedic rehabilitation. J Orthop Sports Phys Ther 2013;43(6):422–426. Epub 18 March 2013. doi:10.2519/jospt.2013.4403

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Changes in Human Muscle Spindle Sensitivity during a Proprioceptive Attention Task

Cited by 85 publications

References 33 publications

Fusimotor Drive May Adjust Muscle Spindle Feedback to Task Requirements in Humans

Fusimotor Drive May Adjust Muscle Spindle Feedback to Task Requirements in Humans

Neural correlates of task-related changes in physiological tremor

Enhanced Proprioceptive Acuity at the Knee in the Competitive Athlete

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