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Peter J Mcnair - One of the best experts on this subject based on the ideXlab platform.

  • biomechanical properties of the plantar Flexor Muscle tendon complex 6 months post rupture of the achilles tendon
    Journal of Orthopaedic Research, 2013
    Co-Authors: Peter J Mcnair, Antoine Nordez, Margie Olds, Simon W Young, Christophe Cornu
    Abstract:

    We compared the effects of a non-weight bearing protocol (NWB) and a weight bearing (WB) protocol on energy stored, stiffness, and shock absorption in the plantar Flexor Muscle–tendon unit of patients managed non-operatively following an Achilles tendon rupture. Thirty-eight subjects were randomized to a WB cast fitted with a Bohler iron or a traditional non-weight-bearing cast. At a 6-month follow-up, a biomechanical assessment utilizing an isokinetic dynamometer allowed measurement of peak passive torque, energy stored, shock absorption, and stiffness. The WB group had greater peak passive torque (∼20%). Irrespective of group, peak passive torque in unaffected legs was greater (∼26%) than affected legs. Across the groups, energy stored in the NWB group was 74% of the WB group. The energy stored in affected legs was 80% of that in unaffected legs. Shock absorption was not significantly different across legs or groups. Irrespective of group, affected legs had significantly less stiffness (20–40%). While the augmentation of plaster with a Bohler iron to allow increased weight bearing had positive effects, deficits in affected compared to unaffected legs irrespective of group were notable, and should be addressed prior to participation in vigorous physical activities. © 2013 Orthopaedic Research Society Published by Wiley Periodicals, Inc. J Orthop Res 31:1469–1474, 2013

  • effect of eccentric training on the plantar Flexor Muscle tendon tissue properties
    Medicine and Science in Sports and Exercise, 2008
    Co-Authors: Nele Mahieu, Peter J Mcnair, Ann Cools, Caroline Dhaen, Katrien Vandermeulen, Erik Witvrouw
    Abstract:

    Purpose: It has been shown that eccentric training can be effective in the rehabilitation of patients with Achilles tendonopathy. The mechanism behind these results is not clear. However, there is evidence that tendons are able to respond to repeated forces by altering their structure and composition, and, thus, their mechanical properties change. In this regard, the objective of the present study was to investigate whether eccentric training affects the mechanical properties of the plantar Flexor's Muscle-tendon tissue properties. Methods: Seventy-four healthy subjects were randomized into two groups: an eccentric training group and a control group. The eccentric training group performed a 6-wk eccentric training program for the calf Muscles. Before and after this period, all subjects were evaluated for dorsiflexion range of motion using universal goniometry, passive resistive torque of the plantar Flexors, and stiffness of the Achilles tendon. Passive resistive torque was measured during ankle dorsiflexion on an isokinetic dynamometer. Stiffness of the Achilles tendon was assessed using a dynamometer, in combination with ultrasonography. Results: The results of the study reveal that the dorsiflexion range of motion was significantly increased only in the eccentric training group. The eccentric heel drop program also resulted in a significant decrease of the passive resistive torque of the plantar Flexors (from 16.423 ± 0.827 to 12.651 ± 0.617 N·m). The stiffness of the Achilles tendon did not change significantly as a result of training. Conclusion: These findings provide evidence that an eccentric training program results in changes to some of the mechanical properties of the plantar Flexor Muscles. These changes were thought to be associated with modifications to structure rather than to stretch tolerance.

  • biomechanical behavior of the plantar Flexor Muscle tendon unit after an achilles tendon rupture
    American Journal of Sports Medicine, 2001
    Co-Authors: Eadric Bressel, Peter J Mcnair
    Abstract:

    The purpose of this study was to examine the biomechanical behavior of the plantar Flexor Muscle-tendon unit in subjects who had ruptured their Achilles tendon. Twenty-six men and 14 women volunteered for the study. Eighteen subjects had been treated operatively and 22, nonoperatively. All subjects had ruptured their Achilles tendon more than 1 year before the study, and 28 of the 40 ruptures occurred 5 years or less before the day of testing. A KinCom dynamometer was used to measure ankle joint angle, passive torque, and maximal isometric plantar Flexor torque. During a 2-minute passive calf stretch, stiffness and torque relaxation were calculated. Isometric torque and peak passive torque were 17% and 10% greater for the uninvolved versus the involved limb, whereas stiffness and torque relaxation were not different between limbs. The time since injury did not influence the results, nor did the mode of initial treatment, that is, whether the subjects were treated operatively or nonoperatively. These findi...

Gwendolen Jull - One of the best experts on this subject based on the ideXlab platform.

  • Muscle specificity in tests of cervical Flexor Muscle performance
    Journal of Electromyography and Kinesiology, 2007
    Co-Authors: Shaun Oleary, Gwendolen Jull, Deborah Falla, Bill Vicenzino
    Abstract:

    The deep cervical Flexor (DCF) Muscles are considered to be of substantial clinical importance in the management of neck pain. While conventional cervical flexion (CF) dynamometry methods have been used frequently to assess the capacity of the cervical Flexor Muscles, it has been suggested that cranio-cervical flexion (CCF) methods may provide a more specific test of DCF Muscle performance. This study compared the activation of the deep and superficial cervical Flexor Muscles between tests of isometric cranio-cervical flexion (CCF) and conventional cervical flexion (CF) dynamometry. Normalised root-mean-square values were recorded for the deep cervical Flexor (DCF), sternocleidomastoid (SCM), anterior scalene (AS), and sternohyoid (SH) Muscles during isometric CCF and CF tests at maximal voluntary contraction (MVC), 50% MVC, and 20% MVC in ten healthy volunteers. The results demonstrated significantly greater electromyography (EMG) amplitude for the SCM (P <.001-002) and AS (P <.001-.001) Muscles in the CF test conditions (MVC, 20%MVC, and 50%MVC) compared to CCF test conditions. Moreover, the SH Muscle demonstrated significantly greater EMG amplitude during CF compared to CCF but only in the 50% MVC and 20% MVC conditions (P =.007 and .02 respectively). These results demonstrate that dynamometry tests of CF result in greater activity of the superficial cervical Flexor Muscles compared to tests of CCF. As a result, CCF dynamometry may provide a more specific method to assess and retrain DCF Muscle performance, compared to conventional CF in which superficial Muscle activity may mask impaired performance of the DCF Muscles. (C) 2005 Elsevier Ltd. All rights reserved.

  • specificity in retraining craniocervical Flexor Muscle performance
    Journal of Orthopaedic & Sports Physical Therapy, 2007
    Co-Authors: Shaun Oleary, Gwendolen Jull, Bill Vicenzino
    Abstract:

    Study Design A multivariate repeated-measures independent-group study design. Objectives To compare the effect of a craniocervical flexion exercise (CCFEx) program to that of a conventional cervical flexion exercise (CFEx) program in training isometric craniocervical Flexor Muscle performance. Background The craniocervical Flexor Muscles are important Muscles of the cervical spine, as they have been shown to be impaired in persons with chronic neck pain. While both CCFEx and CFEx protocols have been advocated to train craniocervical Flexor Muscle performance, at present there is no consensus as to the most effective method. Methods and Measures Fifty females with chronic mild neck pain and disability status were randomly allocated into a 6-week program of either CCFEx (n = 27) or CFEx (n = 23). Isometric dynamometry measurements of craniocervical Flexor Muscle performance (maximal voluntary contraction, endurance at 50% of maximal voluntary contraction) were recorded before and following the exercise prog...

  • an endurance strength training regime is effective in reducing myoelectric manifestations of cervical Flexor Muscle fatigue in females with chronic neck pain
    Clinical Neurophysiology, 2006
    Co-Authors: Deborah Falla, Gwendolen Jull, Paul W Hodges, Bill Vicenzino
    Abstract:

    Objective: The purpose of this study was to investigate whether an endurance-strength training program is effective in reducing myoelectric manifestations of sternocleidomastoid (SCM) and anterior scalene (AS) Muscle fatigue which have been found to be greater in people with chronic neck pain. Methods: Fifty-eight female patients with chronic non-severe neck pain were randomized into one of two 6-week exercise intervention groups: an endurance-strength training regime for the cervical Flexor Muscles or a referent exercise intervention involving low load retraining of the cranio-cervical Flexor Muscles. The primary outcomes were a change in maximum voluntary contraction (MVC) force and change of the initial value and rate of change of the mean frequency, average rectified value and conduction velocity detected from the SCM and AS Muscles during sub-maximal isometric cervical flexion contractions at 50, 25 and 10% MVC. Results: At the 7th week follow-up assessment, the endurance-strength training group revealed a significant increase in MVC force and a reduction in the estimates of the initial value and rate of change of the mean frequency for both the SCM and AS Muscles (P < 0.05). Both exercise groups reported a reduced average intensity of neck pain and reduced neck disability index score (P < 0.05). Conclusions: An endurance-strength exercise regime for the cervical Flexor Muscles is effective in reducing myoelectric manifestations of superficial cervical Flexor Muscle fatigue as well as increasing cervical flexion strength in a group of patients with chronic non-severe neck pain. Significance: Provision of load to challenge the neck Flexor Muscles is required to reduce the fatigability of the SCM and AS Muscles in people with neck pain. Improvements in cervical Muscle strength and reduced fatigability may be responsible for the reported efficacy with this type of exercise program. (c) 2006 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All fights reserved.

  • Muscle specificity in tests of cervical Flexor Muscle performance
    Journal of Electromyography and Kinesiology, 2006
    Co-Authors: Shaun O'leary, Gwendolen Jull, Deborah Falla, Bill Vicenzino
    Abstract:

    The deep cervical Flexor (DCF) Muscles are considered to be of substantial clinical importance in the management of neck pain. While conventional cervical flexion (CF) dynamometry methods have been used frequently to assess the capacity of the cervical Flexor Muscles, it has been suggested that cranio-cervical flexion (CCF) methods may provide a more specific test of DCF Muscle performance. This study compared the activation of the deep and superficial cervical Flexor Muscles between tests of isometric cranio-cervical flexion (CCF) and conventional cervical flexion (CF) dynamometry. Normalised root-mean-square values were recorded for the deep cervical Flexor (DCF), sternocleidomastoid (SCM), anterior scalene (AS), and sternohyoid (SH) Muscles during isometric CCF and CF tests at maximal voluntary contraction (MVC), 50% MVC, and 20% MVC in ten healthy volunteers. The results demonstrated significantly greater electromyography (EMG) amplitude for the SCM (P

  • neck Flexor Muscle fatigue is side specific in patients with unilateral neck pain
    European Journal of Pain, 2004
    Co-Authors: Deborah Falla, Gwendolen Jull, Alberto Rainoldi, Roberto Merletti
    Abstract:

    Despite the evidence of greater fatigability of the cervical Flexor Muscles in neck pain patients, the effect of unilaterality of neck pain on Muscle fatigue has not been investigated. This study compared myoelectric manifestations of sternocleidomastoid (SCM) and anterior scalene (AS) Muscle fatigue between the painful and non-painful sides in patients with chronic unilateral neck pain. Myoelectric signals were recorded from the sternal head of SCM and the AS Muscles bilaterally during sub-maximal isometric cervical flexion contractions at 25% and 50% of the maximum voluntary contraction (MVC). The time course of the mean power frequency, average rectified value and conduction velocity of the electromyographic signals were calculated to quantify myoelectric manifestations of Muscle fatigue. Results revealed greater estimates of the initial value and slope of the mean frequency for both the SCM and AS Muscles on the side of the patient's neck pain at 25% and 50% of MVC. These results indicate greater myoelectric manifestations of Muscle fatigue of the superficial cervical Flexor Muscles ipsilateral to the side of pain. This suggests a specificity of the effect of pain on Muscle function and hence the need for specificity of therapeutic exercise in the management of neck pain patients. (C) 2003 European Federation of Chapters of the International Association for the Study of Pain. Published by Elsevier Ltd. All rights reserved.

Erik Witvrouw - One of the best experts on this subject based on the ideXlab platform.

  • effect of proprioceptive neuromuscular facilitation stretching on the plantar Flexor Muscle tendon tissue properties
    Scandinavian Journal of Medicine & Science in Sports, 2009
    Co-Authors: Nele Mahieu, Ann Cools, B De Wilde, M Boon, Erik Witvrouw
    Abstract:

    Proprioceptive neuromuscular facilitation (PNF) stretching programs have been shown to be the most effective stretching technique to increase the range of motion (ROM). The objective of this study was to examine the mechanism of effect of PNF stretching on changes in the ROM. Sixty-two healthy subjects were randomized into two groups: a PNF stretching group and a control group. The PNF group performed a 6-week stretching program for the calf Muscles. Before and after this period, all subjects were evaluated for dorsiflexion ROM, passive resistive torque (PRT) of the plantar Flexors and stiffness of the Achilles tendon. The results of the study revealed that the dorsiflexion ROM was significantly increased in the PNF group (ΔROMext: 5.97±0.671°; ΔROMflex: 5.697±0.788°). The PRT of the plantar Flexors and the stiffness of the Achilles tendon did not change significantly after 6 weeks of PNF stretching. These findings provide evidence that PNF stretching results in an increased ankle dorsiflexion. However, this increase in ROM could not be explained by a decrease of the PRT or by a change in stiffness of the Achilles tendon, and therefore can be explained by an increase in stretch tolerance.

  • effect of eccentric training on the plantar Flexor Muscle tendon tissue properties
    Medicine and Science in Sports and Exercise, 2008
    Co-Authors: Nele Mahieu, Peter J Mcnair, Ann Cools, Caroline Dhaen, Katrien Vandermeulen, Erik Witvrouw
    Abstract:

    Purpose: It has been shown that eccentric training can be effective in the rehabilitation of patients with Achilles tendonopathy. The mechanism behind these results is not clear. However, there is evidence that tendons are able to respond to repeated forces by altering their structure and composition, and, thus, their mechanical properties change. In this regard, the objective of the present study was to investigate whether eccentric training affects the mechanical properties of the plantar Flexor's Muscle-tendon tissue properties. Methods: Seventy-four healthy subjects were randomized into two groups: an eccentric training group and a control group. The eccentric training group performed a 6-wk eccentric training program for the calf Muscles. Before and after this period, all subjects were evaluated for dorsiflexion range of motion using universal goniometry, passive resistive torque of the plantar Flexors, and stiffness of the Achilles tendon. Passive resistive torque was measured during ankle dorsiflexion on an isokinetic dynamometer. Stiffness of the Achilles tendon was assessed using a dynamometer, in combination with ultrasonography. Results: The results of the study reveal that the dorsiflexion range of motion was significantly increased only in the eccentric training group. The eccentric heel drop program also resulted in a significant decrease of the passive resistive torque of the plantar Flexors (from 16.423 ± 0.827 to 12.651 ± 0.617 N·m). The stiffness of the Achilles tendon did not change significantly as a result of training. Conclusion: These findings provide evidence that an eccentric training program results in changes to some of the mechanical properties of the plantar Flexor Muscles. These changes were thought to be associated with modifications to structure rather than to stretch tolerance.

Deborah Falla - One of the best experts on this subject based on the ideXlab platform.

  • Muscle specificity in tests of cervical Flexor Muscle performance
    Journal of Electromyography and Kinesiology, 2007
    Co-Authors: Shaun Oleary, Gwendolen Jull, Deborah Falla, Bill Vicenzino
    Abstract:

    The deep cervical Flexor (DCF) Muscles are considered to be of substantial clinical importance in the management of neck pain. While conventional cervical flexion (CF) dynamometry methods have been used frequently to assess the capacity of the cervical Flexor Muscles, it has been suggested that cranio-cervical flexion (CCF) methods may provide a more specific test of DCF Muscle performance. This study compared the activation of the deep and superficial cervical Flexor Muscles between tests of isometric cranio-cervical flexion (CCF) and conventional cervical flexion (CF) dynamometry. Normalised root-mean-square values were recorded for the deep cervical Flexor (DCF), sternocleidomastoid (SCM), anterior scalene (AS), and sternohyoid (SH) Muscles during isometric CCF and CF tests at maximal voluntary contraction (MVC), 50% MVC, and 20% MVC in ten healthy volunteers. The results demonstrated significantly greater electromyography (EMG) amplitude for the SCM (P <.001-002) and AS (P <.001-.001) Muscles in the CF test conditions (MVC, 20%MVC, and 50%MVC) compared to CCF test conditions. Moreover, the SH Muscle demonstrated significantly greater EMG amplitude during CF compared to CCF but only in the 50% MVC and 20% MVC conditions (P =.007 and .02 respectively). These results demonstrate that dynamometry tests of CF result in greater activity of the superficial cervical Flexor Muscles compared to tests of CCF. As a result, CCF dynamometry may provide a more specific method to assess and retrain DCF Muscle performance, compared to conventional CF in which superficial Muscle activity may mask impaired performance of the DCF Muscles. (C) 2005 Elsevier Ltd. All rights reserved.

  • an endurance strength training regime is effective in reducing myoelectric manifestations of cervical Flexor Muscle fatigue in females with chronic neck pain
    Clinical Neurophysiology, 2006
    Co-Authors: Deborah Falla, Gwendolen Jull, Paul W Hodges, Bill Vicenzino
    Abstract:

    Objective: The purpose of this study was to investigate whether an endurance-strength training program is effective in reducing myoelectric manifestations of sternocleidomastoid (SCM) and anterior scalene (AS) Muscle fatigue which have been found to be greater in people with chronic neck pain. Methods: Fifty-eight female patients with chronic non-severe neck pain were randomized into one of two 6-week exercise intervention groups: an endurance-strength training regime for the cervical Flexor Muscles or a referent exercise intervention involving low load retraining of the cranio-cervical Flexor Muscles. The primary outcomes were a change in maximum voluntary contraction (MVC) force and change of the initial value and rate of change of the mean frequency, average rectified value and conduction velocity detected from the SCM and AS Muscles during sub-maximal isometric cervical flexion contractions at 50, 25 and 10% MVC. Results: At the 7th week follow-up assessment, the endurance-strength training group revealed a significant increase in MVC force and a reduction in the estimates of the initial value and rate of change of the mean frequency for both the SCM and AS Muscles (P < 0.05). Both exercise groups reported a reduced average intensity of neck pain and reduced neck disability index score (P < 0.05). Conclusions: An endurance-strength exercise regime for the cervical Flexor Muscles is effective in reducing myoelectric manifestations of superficial cervical Flexor Muscle fatigue as well as increasing cervical flexion strength in a group of patients with chronic non-severe neck pain. Significance: Provision of load to challenge the neck Flexor Muscles is required to reduce the fatigability of the SCM and AS Muscles in people with neck pain. Improvements in cervical Muscle strength and reduced fatigability may be responsible for the reported efficacy with this type of exercise program. (c) 2006 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All fights reserved.

  • Muscle specificity in tests of cervical Flexor Muscle performance
    Journal of Electromyography and Kinesiology, 2006
    Co-Authors: Shaun O'leary, Gwendolen Jull, Deborah Falla, Bill Vicenzino
    Abstract:

    The deep cervical Flexor (DCF) Muscles are considered to be of substantial clinical importance in the management of neck pain. While conventional cervical flexion (CF) dynamometry methods have been used frequently to assess the capacity of the cervical Flexor Muscles, it has been suggested that cranio-cervical flexion (CCF) methods may provide a more specific test of DCF Muscle performance. This study compared the activation of the deep and superficial cervical Flexor Muscles between tests of isometric cranio-cervical flexion (CCF) and conventional cervical flexion (CF) dynamometry. Normalised root-mean-square values were recorded for the deep cervical Flexor (DCF), sternocleidomastoid (SCM), anterior scalene (AS), and sternohyoid (SH) Muscles during isometric CCF and CF tests at maximal voluntary contraction (MVC), 50% MVC, and 20% MVC in ten healthy volunteers. The results demonstrated significantly greater electromyography (EMG) amplitude for the SCM (P

  • neck Flexor Muscle fatigue is side specific in patients with unilateral neck pain
    European Journal of Pain, 2004
    Co-Authors: Deborah Falla, Gwendolen Jull, Alberto Rainoldi, Roberto Merletti
    Abstract:

    Despite the evidence of greater fatigability of the cervical Flexor Muscles in neck pain patients, the effect of unilaterality of neck pain on Muscle fatigue has not been investigated. This study compared myoelectric manifestations of sternocleidomastoid (SCM) and anterior scalene (AS) Muscle fatigue between the painful and non-painful sides in patients with chronic unilateral neck pain. Myoelectric signals were recorded from the sternal head of SCM and the AS Muscles bilaterally during sub-maximal isometric cervical flexion contractions at 25% and 50% of the maximum voluntary contraction (MVC). The time course of the mean power frequency, average rectified value and conduction velocity of the electromyographic signals were calculated to quantify myoelectric manifestations of Muscle fatigue. Results revealed greater estimates of the initial value and slope of the mean frequency for both the SCM and AS Muscles on the side of the patient's neck pain at 25% and 50% of MVC. These results indicate greater myoelectric manifestations of Muscle fatigue of the superficial cervical Flexor Muscles ipsilateral to the side of pain. This suggests a specificity of the effect of pain on Muscle function and hence the need for specificity of therapeutic exercise in the management of neck pain patients. (C) 2003 European Federation of Chapters of the International Association for the Study of Pain. Published by Elsevier Ltd. All rights reserved.

Nicolas Vuillerme - One of the best experts on this subject based on the ideXlab platform.

  • Do somatosensory conditions from the foot and ankle affect postural responses to plantar-Flexor Muscles fatigue during bipedal quiet stance?
    Gait & Posture, 2012
    Co-Authors: Petra Hlavackova, Nicolas Vuillerme
    Abstract:

    Abstract The present study investigated the effects of somatosensory conditions at the foot and ankle on postural responses to plantar-Flexor Muscle fatigue during bipedal quiet stance. Twenty-two young healthy adults were asked to stand upright as still as possible with their eyes closed in three somatosensory conditions (normal, altered and improved) both prior to and after exercises inducing plantar-Flexor Muscle fatigue. In the normal condition, the postural task was executed on a firm support surface constituted by the force platform. In the altered condition, a 2-cm thick foam support surface was placed under the subjects’ feet. In the improved condition, increased cutaneous feedback at the foot and ankle was provided by strips of athletic tape applied across both their ankle joints. Muscle fatigue was induced in the plantar-Flexor Muscles of both legs through the execution of a repeated standing heel raise exercise. Centre of foot pressure displacements were recorded using a force platform. Results showed that plantar-Flexor Muscle fatigue yielded increased centre of foot pressure displacements under normal foot and ankle sensory conditions. Furthermore, this effect was exacerbated under altered foot and ankle sensory conditions and mitigated under improved foot and ankle sensory conditions. Altogether, the present findings suggested an increased reliance on somatosensory information from the foot and ankle for controlling upright posture in the presence of plantar-Flexor Muscle fatigue.

  • effects of plantar Flexor Muscle fatigue on the magnitude and regularity of center of pressure fluctuations
    Experimental Brain Research, 2011
    Co-Authors: Melvyn Roerdink, Petra Hlavackova, Nicolas Vuillerme
    Abstract:

    Control of bipedal posture is highly automatized but requires attentional investment, the amount of which varies between participants and with postural constraints, such as plantar-Flexor Muscle fatigue. Elevated attentional demands for standing with fatigued plantar Flexors have been demonstrated using a stimulus–response reaction-time paradigm. Recently, a direct relation between the regularity of center-of-pressure (COP) fluctuations and the amount of attention invested in posture was proposed, according to which more regular COP fluctuations are expected with Muscle fatigue than without. To study this prediction, we registered anterior–posterior COP fluctuations for bipedal stance with eyes closed prior to and after a plantar-Flexor Muscle fatiguing exercise protocol in 16 healthy young adults. We quantified the magnitude of COP fluctuations with conventional posturography and its regularity with sample entropy. The magnitude of COP fluctuations increased significantly with fatigued plantar Flexors. In addition, more regular COP fluctuations were observed with fatigued plantar Flexors, as evidenced by significantly lower sample entropy values. These findings corroborated our hypotheses. Moreover, COP regularity assisted in qualifying the change in sway magnitude with fatigue. Whereas increased sway is customary taken to reflect impaired postural control, we interpret it as a functional, but attention-demanding adaptation to the alteration of important posture-specific information.

  • differential postural effects of plantar Flexor Muscle fatigue under normal altered and improved vestibular and neck somatosensory conditions
    Experimental Brain Research, 2008
    Co-Authors: Nicolas Pinsault, Nicolas Vuillerme
    Abstract:

    The aim of the present study was to assess the effects of plantar–Flexor Muscle fatigue on postural control during quiet standing under normal, altered and improved vestibular and neck somatosensory conditions. To address this objective, young male university students were asked to stand upright as still as possible with their eyes closed in two conditions of No Fatigue and Fatigue of the plantar–Flexor Muscles. In Experiment 1 (n = 15), the postural task was executed in two postures: Neutral head and Head tilted-backward postures, recognized to degrade vestibular and neck somatosensory information. In Experiment 2 (n = 15), the postural task was executed in two conditions of No tactile and Tactile stimulation of the neck provided by the application of strips of adhesive bandage to the skin over and around the neck. Centre of foot pressure displacements were recorded using a force platform. Results showed that (1) the Fatigue condition yielded increased CoP displacements relative to the No Fatigue condition (Experiment 1 and Experiment 2), (2) this destabilizing effect was more accentuated in the Head tilted-backward posture than Neutral head posture (Experiment 1) and (3) this destabilizing effect was less accentuated in the condition of Tactile stimulation than that of No tactile stimulation of the neck (Experiment 2). In the context of the multisensory control of balance, these results suggest an increased reliance on vestibular and neck somatosensory information for controlling posture during quiet standing in condition of altered ankle neuromuscular function.