Effects of cutaneous afferent input on fatigue-induced changes in fusimotor activity of decerebrate cats

Ljubisavljević, M.; Vukčević, Ivana; Radovanović, Saša; Milanović, Svetlana; Anastasijević, Radmila

doi:10.1016/s0306-4522(97)00039-0

Cited by 6 publications

(2 citation statements)

References 20 publications

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“…However, an indirect involvement of spindles cannot be excluded since various sensory signals can influence c-motoneurons activity and consequently, alter the spindle input [6]. In addition, it has been shown that the skin just above a contracting muscle, close to the tendon, is a cutaneous area responsible for modulation of monosynaptic reflexes and c-motoneuron activity [14].…”

Section: Discussionmentioning

confidence: 99%

Improvement of posture stability by vibratory stimulation following anterior cruciate ligament reconstruction

Brunetti

Filippi

Lorenzini³

et al. 2006

Knee Surg Sports Traumatol Arthrosc

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Surgical reconstruction of the anterior cruciate ligament (ACL) may reduce, but it does not always eliminate, knee and body instability because of a persisting proprioceptive deficit. In order to enhance body stability, a new protocol of treatment has been proposed consisting of mechanical vibration (100 Hz frequency and < 20 microm amplitude) of the quadriceps muscle in the leg that has undergone ACL reconstruction. In our trials, stimulation was performed when the quadriceps muscle was kept isometrically contracted. Treatment was started one month after surgery. Vibration was applied for short periods over three consecutive days. Nine months after treatment, postural stability was re-evaluated with the subjects standing on one leg with open and with closed eyes. The postural stability of the subjects having undergone vibration treatment, standing on the operated leg was significantly improved one day after treatment when evaluated as mean of speed and elliptic area of the center of pressure. The improvement persisted and increased during the following weeks. Peak torques of the operated leg extensor muscles also increased and reached values close to that of the leg, which had not been operated. Conversely, the balance of the untreated subjects standing on the operated leg did not improve and the restoration of the extensor muscle peak torque was poor. It is concluded that short lasting proprioceptive activation by vibration may lead to a faster and more complete equilibrium recovery probably by permanently changing the network controlling knee posture.

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Section: Discussionmentioning

confidence: 99%

Improvement of posture stability by vibratory stimulation following anterior cruciate ligament reconstruction

Brunetti

Filippi

Lorenzini³

et al. 2006

Knee Surg Sports Traumatol Arthrosc

View full text Add to dashboard Cite

show abstract

“…However, recording in human subjects has shown that if the contraction is sustained at a moderate constant force, a decrease occurs in the ®ring of Ia ®bres (Mace®eld et al 1991). Animal studies have demonstrated a late increase in fusimotor drive as metabolites accumulate in fatigued muscle but it is not clear how this aects spindle ®ring in intact animals or humans Ljubisavljevic et al , 1997. Spindle ®ring will be quite dierent in exercise in which the muscle changes length.…”

Section: Activity In Muscle Afferents and Fatiguementioning

confidence: 99%

Changes in muscle afferents, motoneurons and motor drive during muscle fatigue

Taylor

Butler²,

Gandevia³

2000

European Journal of Applied Physiology

182

108

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Fatigue is a reduction of maximal muscle force or power that occurs with exercise. It is accompanied by changes at multiple levels in the motor pathway and also by changes in the discharge patterns of muscle afferents. Changes in afferent firing can lead to altered perceptions and can also act on the efferent pathway. Changes in the motor pathway include slowing of motor unit firing rates during sustained maximal voluntary contractions (MVCs). Muscle responses to stimulation at different levels of the motor pathway also change. Transcranial magnetic stimulation of the motor cortex and stimulation of descending tracts in the spinal cord in human subjects show an increase in the response of the cortex and a decrease in response of the motoneuron pool during sustained MVCs. In addition, the silent period following magnetic stimulation is prolonged. During relaxation after fatiguing exercise, muscle responses to stimulation of the motor cortex are initially facilitated and are then depressed for many minutes, whereas responses to descending tract stimulation are initially depressed but recover over about 2 min. Although some of the loss of force of fatigue does occur through inadequate drive to the muscle, it is not clear which, if any, of the changes described in the cortex or the motoneurons are responsible for loss of maximal voluntary force and thus contribute to fatigue. Changes may be associated with muscle fatigue without causing it.

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Acute and cumulative effects of focused high-frequency vibrations on the endocrine system and muscle strength

et al. 2010

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The purpose of this study was to evaluate the acute and long-term effects of local high-intensity vibration (HLV, f = 300 Hz) on muscle performance and blood hormone concentrations in healthy young men. Totally 18 subjects (cV group) were studied in two sessions, either without (control) or with HLV treatment. The protocol was the same on both control and test days, except that, in the second session, subjects underwent HLV treatment. Counter-movement jumping (CMJ), maximal isometric voluntary contraction (MVC) test, and hormonal levels were measured before the procedure, immediately thereafter, and 1 h later. To assess the long-term effects of HLV, the cV group was subjected to HLV on the leg muscles for 4 weeks, and a second group (cR group, n = 18) embarked upon a resistance training program. All subjects underwent an MVC test and an isokinetic (100 deg/s) test before training, 4 weeks after training, and 2 months after the end of training. The HLV protocol significantly increased the serum level of growth hormone (GH, P < 0.05) and creatine phosphokinase (CPK, P < 0.05), and decreased the level of cortisol (P < 0.05). None of GH, CPK or testosterone levels were altered in controls. There was a significant improvement in MVC (P < 0.05). After 4 weeks, both the cV and cR groups demonstrated significant improvement in MVC and isokinetic tests (P < 0.05). This increase persisted for at least 2 months. Our results indicate that HLV influences the levels of particular hormones and improves neuromuscular performance. Our results indicate that HLV has a long-term beneficial effect comparable to that of resistance training.

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Effects of cutaneous afferent input on fatigue-induced changes in fusimotor activity of decerebrate cats

Cited by 6 publications

References 20 publications

Improvement of posture stability by vibratory stimulation following anterior cruciate ligament reconstruction

Improvement of posture stability by vibratory stimulation following anterior cruciate ligament reconstruction

Changes in muscle afferents, motoneurons and motor drive during muscle fatigue

Acute and cumulative effects of focused high-frequency vibrations on the endocrine system and muscle strength

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