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Phu S, Sturnieks DL, Song PYH, Lord SR, Okubo Y. Treadmill induced belt-accelerations may not accurately evoke the muscle responses to obstacle trips in older people. J Electromyogr Kinesiol 2024; 75:102857. [PMID: 38330509 DOI: 10.1016/j.jelekin.2024.102857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 12/19/2023] [Accepted: 01/12/2024] [Indexed: 02/10/2024] Open
Abstract
BACKGROUND Treadmill belt-accelerations are a commonly utilised surrogate for tripping, but their physiological validity is unknown. This study examined if a treadmill belt-acceleration induces lower limb muscle activation responses similar to a trip on a walkway. METHODS 38 older people (65+ years) experienced one treadmill belt-acceleration and one walkway obstacle trip in random order. Muscle responses were assessed bilaterally using surface electromyography on the rectus femoris (RF), tibialis anterior (TA), semitendinosus (ST) and gastrocnemius medial head (GM). Unperturbed muscle activity, post-perturbation onset latency, peak magnitude, time to peak and co-contraction index (CCI) were examined. RESULTS Muscle activity in the right ST was greater during unperturbed walking on the treadmill compared to walkway (P=0.011). Compared to a treadmill belt-acceleration, a walkway trip elicited faster onset latencies in all muscles; greater peak magnitudes in the left RF, TA, GM and right GM; faster time to peaks in the left TA and right GM; and lower knee and ankle muscle CCI (P<0.05). CONCLUSIONS Walkway trips and treadmill belt-accelerations elicit distinct muscle activation patterns. While walkway trips induced faster and larger muscle responses, treadmill belt-accelerations involved greater co-contraction. Therefore, treadmill belt-accelerations may not accurately simulate the muscle responses to trips.
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Affiliation(s)
- Steven Phu
- Falls, Balance and Injury Research Centre, Neuroscience Research Australia, Randwick, NSW, Australia; School of Population Health - Faculty of Medicine and Health, The University of New South Wales, Sydney, NSW, Australia; Department of Medicine, Western Health, The University of Melbourne, St Albans, VIC, Australia
| | - Daina L Sturnieks
- Falls, Balance and Injury Research Centre, Neuroscience Research Australia, Randwick, NSW, Australia; School of Biomedical Sciences - Faculty of Medicine and Health, The University of New South Wales, Sydney, NSW, Australia
| | - Patrick Y H Song
- Falls, Balance and Injury Research Centre, Neuroscience Research Australia, Randwick, NSW, Australia; School of Population Health - Faculty of Medicine and Health, The University of New South Wales, Sydney, NSW, Australia
| | - Stephen R Lord
- Falls, Balance and Injury Research Centre, Neuroscience Research Australia, Randwick, NSW, Australia; School of Population Health - Faculty of Medicine and Health, The University of New South Wales, Sydney, NSW, Australia
| | - Yoshiro Okubo
- Falls, Balance and Injury Research Centre, Neuroscience Research Australia, Randwick, NSW, Australia; School of Population Health - Faculty of Medicine and Health, The University of New South Wales, Sydney, NSW, Australia.
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Shadegani R, Khanmohammadi R, Olyaei G. Comparison of effects of Mulligan taping and Kinesio taping on ankle neuromuscular control in response to a sudden inversion perturbation in individuals with chronic ankle instability. Phys Ther Sport 2023; 63:58-66. [PMID: 37506655 DOI: 10.1016/j.ptsp.2023.07.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 07/24/2023] [Accepted: 07/24/2023] [Indexed: 07/30/2023]
Abstract
OBJECTIVES This study was aimed to compare the effects of Mulligan taping (MT) with Kinesio taping (KT) and the un-taped ankle on neuromuscular control during a sudden inversion perturbation in individuals with chronic ankle instability (CAI). DESIGN Randomized, single blind cross-over. SETTING Biomechanics lab. PARTICIPANTS 16 individuals with chronic ankle instability. MAIN OUTCOME MEASURES The outcome measures were the onset time and magnitude of short (SLR) and medium latency response (MLR) for peroneus brevis (PB), peroneus longus (PL), tibialis anterior (TA), and soleus (SOL) muscles and the TA/P and SOL/TA antagonist co-activation. RESULTS In the groups of KT and MT, the onset time was significantly decreased at post-taping compared to pre-taping, such that for the onset time of PB MLR, the groups of KT and MT had an earlier onset time than the un-taped group. For the magnitude of TA SLR and PB MLR, groups exhibited different behaviors. In the KT group, the magnitude was significantly increased post-taping, however, in the MT group, it was decreased. Regarding the TA/P and SOL/TA co-activation, the groups of KT and MT showed significant changes post-taping. CONCLUSION This study suggests that KT and MT significantly affect neuromuscular control in response to a sudden perturbation in individuals with CAI, although the behavior of KT and MT appears to be somewhat different from each other.
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Affiliation(s)
- Roghaye Shadegani
- Physical Therapy Department, Tehran University of Medical Sciences, Tehran, Iran
| | - Roya Khanmohammadi
- Physical Therapy Department, Tehran University of Medical Sciences, Tehran, Iran.
| | - Gholamreza Olyaei
- Physical Therapy Department, Tehran University of Medical Sciences, Tehran, Iran
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Pascucci F, Cesari P, Bertucco M, Latash ML. Postural adjustments to self-triggered perturbations under conditions of changes in body orientation. Exp Brain Res 2023:10.1007/s00221-023-06671-0. [PMID: 37479771 PMCID: PMC10386932 DOI: 10.1007/s00221-023-06671-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 07/10/2023] [Indexed: 07/23/2023]
Abstract
We studied anticipatory and compensatory postural adjustments (APAs and CPAs) associated with self-triggered postural perturbations in conditions with changes in the initial body orientation. In particular, we were testing hypotheses on adjustments in the reciprocal and coactivation commands, role of proximal vs. distal muscles, and correlations between changes in indices of APAs and CPAs. Healthy young participants stood on a board with full support or reduced support area and held a standard load in the extended arms. They released the load in a self-paced manned with a standard small-amplitude arm movement. Electromyograms of 12 muscles were recorded and used to compute reciprocal and coactivation indices between three muscle pairs on both sides of the body. The subject's body was oriented toward one of three targets: straight ahead, 60° to the left, and 60° to the right. Body orientation has stronger effects on proximal muscle pairs compared to distal muscles. It led to more consistent changes in the reciprocal command compared to the coactivation command. Indices of APAs and CPAs showed positive correlations across conditions. We conclude that the earlier suggested hierarchical relations between the reciprocal and coactivation command could be task-specific. Predominance of negative or positive correlations between APA and CPA indices could also be task-specific.
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Affiliation(s)
- Francesco Pascucci
- Department of Engineering for Innovation Medicine, University of Verona, Verona, Italy
| | - Paola Cesari
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Felice Casorati 43, 37131, Verona, Italy.
| | - Matteo Bertucco
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Felice Casorati 43, 37131, Verona, Italy
| | - Mark L Latash
- Department of Kinesiology, The Pennsylvania State University, University Park, PA, 16802, USA
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Ida H, Mohapatra S, Aruin AS. Perceptual distortion in virtual reality and its impact on dynamic postural control. Gait Posture 2022; 92:123-8. [PMID: 34844150 DOI: 10.1016/j.gaitpost.2021.11.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 08/29/2021] [Accepted: 11/11/2021] [Indexed: 02/02/2023]
Abstract
BACKGROUND Voluntary movement such as lifting a foot in preparation to stepping acts as a self-initiated perturbation that disturbs postural equilibrium. To maintain and restore equilibrium, humans utilize early, anticipatory, and compensatory postural adjustments. Despite technological progress in accessible virtual reality (VR) devices, little is known on the usage of VR in control and maintenance of balance while standing. RESEARCH QUESTION How does VR modulate early, anticipatory, and compensatory postural adjustments during a dynamic task of leg lifting while avoiding an obstacle? METHODS First, the postural adjustments in a single-leg obstacle avoidance were compared between real and VR settings, where a statistical reanalysis was performed with data subsets that minimize the difference of foot elevation speed. Second, the effect of simple foot elevation was examined to identify the fundamental nature of leg lifting motion as a self-initiated perturbation. Lastly, perceptual distortion in VR was assessed by evaluating how the spatial scale of the virtual scene used in the single-leg obstacle avoidance experiment was recognized by participants. RESULTS The VR setting reduced the activities of lower leg muscles on the supporting side not only in the compensatory phase but also in the preparatory early and anticipatory phases. On the other hand, simple foot elevation resulted in a significant increase of muscle activities with lifting height only found in the compensatory phase. Furthermore, it is suggested that the VR induced perceptual distortion in estimating the sizes of the virtual objects. SIGNIFICANCE The findings provide more definitive evidence that VR presentation modulates the components of postural adjustments for maintaining upright stance while being perturbed. One of the potential psychophysical factors is perceptual distortion in VR, and this provides critical information for further development of VR based training system.
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Lyu H, Fan Y, Hua A, Cao X, Gao Y, Wang J. Effects of unilateral and bilateral lower extremity fatiguing exercises on postural control during quiet stance and self-initiated perturbation. Hum Mov Sci 2021; 81:102911. [PMID: 34906841 DOI: 10.1016/j.humov.2021.102911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 10/29/2021] [Accepted: 12/03/2021] [Indexed: 11/23/2022]
Abstract
Postural control can be more difficult during muscle fatigue. Anticipatory postural adjustments (APAs) and compensatory postural adjustments (CPAs) are the two main postural strategies controlled by the central nervous system. Unchanged or early anticipatory onset together with altered activation magnitude during the APAs phase is observed in the trunk and thigh muscles following unilateral and bilateral fatiguing exercises. Thus far, no studies have compared the effect of such exercises on APAs and CPAs. This study compared the effects of these exercises performed at the same relative workload on center of pressure (COP)-based postural stability measures during quiet stance and electromyography (EMG)-based APAs and CPAs during self-initiated perturbation. Fifteen young male subjects completed the two separated fatiguing sessions; 50% of maximal voluntary contraction force obtained from the unilateral (dominant) and bilateral legs with five sets of 20 times lower limb exercise was respectively applied as unilateral and bilateral fatiguing protocols. Spatio-temporal COP parameters (sway velocity, total displacement, and envelope area) were used to evaluate postural stability, and spectral analysis was performed to estimate the distributions in COP power spectrum. EMG activities of transversus abdominis/internal oblique (TrA/IO) and lumbar multifidus (LMF) were recorded and analyzed during the APAs and CPAs phases. Increased sway velocity and total displacements occurred following both unilateral and bilateral fatiguing exercises; however, the envelope area was not affected. Further, early anticipatory onset of TrA/IO was found after bilateral than after unilateral fatiguing exercise. Co-activation index of the TrA/IO-LMF muscle pair during the CPAs phase increased following both fatiguing sessions. The results partly confirmed previously reported fatigue effects induced by unilateral and bilateral exercises on postural stability. It was observed that APAs onsets were altered differently following a unilateral or bilateral fatiguing exercise, whereas the alterations of CPAs were independent of fatigue conditions. Repetitive unilateral or bilateral fatiguing exercises in patients or athletes may differently alter the anticipatory component of postural control.
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Lyu H, Fan Y, Hao Z, Wang J. Effect of local and general fatiguing exercises on disturbed and static postural control. J Electromyogr Kinesiol 2020; 56:102487. [PMID: 33221599 DOI: 10.1016/j.jelekin.2020.102487] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 10/16/2020] [Accepted: 10/30/2020] [Indexed: 11/24/2022] Open
Abstract
This study compared the effect of local and general fatiguing exercise on disturbed and static postural control performances. Surface electromyography and center of pressure signals were respectively recorded during self-initiated perturbation test and static postural stability test from 7 young male subjects. Local fatiguing exercise was performed using intermittent isometric knee extensions at the level of 40% of maximal voluntary torques. General fatiguing exercise was implemented with rowing ergometer at a speed of 200 ± 5 m/min. Results of disturbed postural tests showed no significant change of anticipatory postural adjustment (APAs) organizations in individual muscles following both fatiguing exercises, but observed larger APAs coactivations in trunk and dorsal muscle pairs following local than general fatiguing exercise, and larger compensatory postural adjustments (CPAs) coactivation in dorsal muscle pair after both fatiguing exercises. In addition, the results of static postural tests indicated efficient static postural stability accompanying the down-weighting of visual input and the up-weighting of vestibular/somatosensory component following both fatiguing exercises. These findings evidenced a general compensation in the central nervous system in response to the neuromuscular deficiencies induced by local fatiguing exercise and put forward the function of sensory recalibration in maintaining postural stability under fatigue conditions.
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Affiliation(s)
- Hui Lyu
- Department of Sports Science, College of Education, Zhejiang University, Hangzhou 310058, China
| | - Yong Fan
- Sports Department, Hangzhou Normal University Qianjiang College, Hangzhou 310036, China
| | - Zengming Hao
- Department of Sports Science, College of Education, Zhejiang University, Hangzhou 310058, China
| | - Jian Wang
- Department of Sports Science, College of Education, Zhejiang University, Hangzhou 310058, China; Centre for Psychological Sciences, Zhejiang University, Hangzhou 310028, China.
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Kaewmanee T, Liang H, Aruin AS. Effect of predictability of the magnitude of a perturbation on anticipatory and compensatory postural adjustments. Exp Brain Res 2020; 238:2207-2219. [PMID: 32696073 DOI: 10.1007/s00221-020-05883-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 07/13/2020] [Indexed: 12/30/2022]
Abstract
Balance maintenance in response to a perturbation could be affected by the predictability of the magnitude of the body disturbance. We investigated anticipatory (APAs) and compensatory (CPAs) postural adjustments in response to perturbations of predictable and unpredictable magnitudes. Twenty young adults received series of perturbations of small or large magnitudes the order of which was varied. Electromyographic activity of six leg and trunk muscles and displacements of the center-of-pressure (COP) were recorded. The muscle onset time, integrals of muscle activity, and COP displacements in the anterior-posterior direction were analyzed during the APA and CPA phases. The results indicated that when the participants were exposed to the repeated perturbation magnitude, it became predictable and they generated APAs more precisely according to the magnitudes of the perturbation. Moreover, when the magnitude of perturbation changed unpredictably, the participants overestimated or underestimated the magnitudes of the perturbation, as they generated APAs based on their prior experience of dealing with the perturbation. The optimal adjustment of APAs occurred after five trials of repeated perturbations. The findings imply that the process of APAs and CPAs generation depends on the accuracy of the predictability of perturbation magnitudes.
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Affiliation(s)
- Tippawan Kaewmanee
- PhD Program in Rehabilitation Sciences, College of Applied Health Sciences, University of Illinois at Chicago, Chicago, USA
| | - Huaqing Liang
- Department of Physical Therapy (MC 898), University of Illinois at Chicago, 1919 W. Taylor St, Chicago, IL, 60612, USA
| | - Alexander S Aruin
- Department of Physical Therapy (MC 898), University of Illinois at Chicago, 1919 W. Taylor St, Chicago, IL, 60612, USA.
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Zhang Z, Gao Y, Wang J. Effects of vision and cognitive load on anticipatory and compensatory postural control. Hum Mov Sci 2019; 64:398-408. [PMID: 30876761 DOI: 10.1016/j.humov.2019.02.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 02/01/2019] [Accepted: 02/19/2019] [Indexed: 11/30/2022]
Abstract
This study assessed the effects of vision and cognitive load on anticipatory postural adjustments (APAs) and compensatory postural adjustments (CPAs) in response to an externally triggered postural perturbation. A ball-hitting test was repeated under different visual conditions (eyes open, EO; eyes closed, EC) and cognitive loads (no load, 3-subtraction task, time-limited 3-subtraction task). Data were collected separately for I) surface electromyography from the right side of the biceps brachii (BIC) and erector spinae (ES) to detect the latency and response intensity (RI); and II) displacement of the centre of pressure (ΔCOP) to detect the standard deviation (ΔCOPSD) and maximum value (ΔCOPmax) in the anterior-posterior direction. Compared with the results under the EC condition, the ES latency was shorter and the RI of the BIC was lower under the EO condition. Accordingly, the ΔCOPSD and ΔCOPmax were increased in the APAs phase and decreased in the CPAs phase. Cognitive load had no effect on APAs and CPAs or on ΔCOP in the APAs phase. However, ΔCOPmax was decreased in the CPAs phase during the EC condition. In conclusion, vision played an important role in APAs and CPAs for muscle activation and ΔCOP. Cognitive load had no effect on neuromuscular APAs or CPAs except when the postural perturbation occurred when visually unexpected.
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Affiliation(s)
- Zhi Zhang
- Department of Investigation, Zhejiang Police College, China
| | - Ying Gao
- Education College, Zhejiang University, China
| | - Jian Wang
- Education College, Zhejiang University, China; Center for Psychological Sciences at Zhejiang University, Zhejiang University, China.
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Pavão SL, Pessarelli Visicato L, da Costa CSN, de Campos AC, Rocha NACF. Effect of the severity of manual impairment and hand dominance on anticipatory and compensatory postural adjustments during manual reaching in children with cerebral palsy. Res Dev Disabil 2018; 83:47-56. [PMID: 30138846 DOI: 10.1016/j.ridd.2018.08.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 06/19/2018] [Accepted: 08/03/2018] [Indexed: 06/08/2023]
Abstract
AIM To investigate the role of the severity of manual impairment and of hand dominance on postural sway during anticipatory [APA] and compensatory [CPA] postural adjustments in a seated manual reaching task performed by children with cerebral palsy (CP) and typical children (TC). METHODS We tested 26 TC (mean age 9.5 ± 2.1 years) and 29 children with CP (age 9.6 ± 3 years) classified based on manual impairment levels as mild (Manual Ability Classification System [MACS] I; n = 18) or moderate-to-severe (MACS II-III, n = 11). Participants were instructed to reach towards a target using their dominant vs. non-dominant arm while sitting on a force-plate. Center of pressure (CoP) sway was analyzed during APA and CPA. RESULTS For all groups, using the non-dominant arm determined greater amplitude and velocity of CoP sway in CPA. Children with moderate-to-severe manual impairment showed greater sway during APA and CPA compared to mild impairment and TC groups. CONCLUSION More severe manual impairment resulted in higher sway during the anticipatory and compensatory phases of the reaching task. Using the non-dominant arm resulted in greater compensatory adjustments during reaching.
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Affiliation(s)
- Silvia Leticia Pavão
- Department of Physiotherapy, Neuropediatrics Section, Federal University of São Carlos, Rod. Washington Luis, km 235, 13565-905, São Carlos, SP, Brazil.
| | - Livia Pessarelli Visicato
- Department of Physiotherapy, Neuropediatrics Section, Federal University of São Carlos, Rod. Washington Luis, km 235, 13565-905, São Carlos, SP, Brazil
| | - Carolina Souza Neves da Costa
- Department of Physiotherapy, Neuropediatrics Section, Federal University of São Carlos, Rod. Washington Luis, km 235, 13565-905, São Carlos, SP, Brazil
| | - Ana Carolina de Campos
- Department of Physiotherapy, Neuropediatrics Section, Federal University of São Carlos, Rod. Washington Luis, km 235, 13565-905, São Carlos, SP, Brazil
| | - Nelci Adriana C F Rocha
- Department of Physiotherapy, Neuropediatrics Section, Federal University of São Carlos, Rod. Washington Luis, km 235, 13565-905, São Carlos, SP, Brazil
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Xie L, Wang J. Anticipatory and compensatory postural adjustments in response to loading perturbation of unknown magnitude. Exp Brain Res 2019; 237:173-80. [PMID: 30368551 DOI: 10.1007/s00221-018-5397-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 10/05/2018] [Indexed: 01/02/2023]
Abstract
In response to sudden postural perturbations, the posture control system uses anticipatory and compensatory postural adjustments (APAs and CPAs) to maintain balance and equilibrium. APAs strengthen as the perturbation magnitude increases, while CPAs remain constant because APAs make the necessary adjustments. However, the magnitude of a postural perturbation cannot always be fully known. This research focused on postural adjustments in response to perturbations with unknown magnitude. Participants caught falling sandbags of three weights on a tray held in their hands. Participants were told about the weight used for the upcoming trial in the KNOWN condition and not told in the UNKNOWN condition. Surface electromyography (sEMG) of the lumbar muscles and displacement of the center of pressure (COP) were recorded synchronously. The results showed that APAs and CPAs were stronger in the UNKNOWN condition than in the KNOWN condition. Meanwhile, in the UNKNOWN condition, the activity of the lumbar muscles and displacements of the COP showed no difference between weight levels. The lumbar erector spinae (LES) and lumbar multifidus (LMF) activated earlier in the UNKNOWN condition than for the heaviest weight in the KNOWN condition. The outcome of this study indicates that APAs and CPAs of lumbar muscles and displacements of the COP are affected by the knowledge of postural perturbations. The central nervous system (CNS) coped with load perturbations of unknown magnitude with redundancy response strategy, based on the maximum assumption of perturbation magnitude.
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Knox MF, Chipchase LS, Schabrun SM, Romero RJ, Marshall PWM. Anticipatory and compensatory postural adjustments in people with low back pain: a systematic review and meta-analysis. Spine J 2018; 18:1934-1949. [PMID: 29906616 DOI: 10.1016/j.spinee.2018.06.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 06/06/2018] [Accepted: 06/06/2018] [Indexed: 02/06/2023]
Abstract
BACKGROUND CONTEXT Despite altered anticipatory (APAs) and compensatory postural adjustments (CPAs) being hypothesized to contribute to the onset and persistence of low back pain (LBP), results from studies comparing people with and without LBP are conflicting. PURPOSE This systematic review aimed to determine whether APAs or CPAs are altered in the presence of acute and chronic LBP. STUDY DESIGN A systematic review of studies was carried out. PATIENT SAMPLE No patient sample was required. OUTCOME MEASURES Between group standardized mean differences and 95% confidence intervals for APAs ad CPAs METHODS: A comprehensive search was conducted for articles comparing people with LBP (acute or chronic) to healthy controls for the onset or amplitude of muscle activity, center of pressure (COP), or kinematic responses to expected or unexpected perturbations. Two independent reviewers extracted data and assessed the methodological quality of relevant studies. Differences between people with and without LBP were calculated as standardized mean differences, and included in a meta-analysis if outcomes were homogeneous. Otherwise, a narrative synthesis was conducted. RESULTS Twenty-seven studies were included, of which the majority examined muscle onsets in response to expected and unexpected perturbations. Only two studies compared people with and without acute LBP, and results for these studies were conflicting. The results show delayed muscle onsets in response to expected and unexpected perturbations for people with chronic LBP when compared with healthy controls. No conclusive evidence for differences between people with and without chronic LBP for COP or kinematic responses. CONCLUSIONS There is currently no convincing evidence of differences between people with and without acute LBP for APAs or CPAs. Conversely, delayed muscle onsets in people with chronic LBP suggest APAs and CPAs are altered in this population. However, the functional relevance of these delayed muscle onsets (eg, COP and kinematics) is unknown.
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Affiliation(s)
- Michael F Knox
- School of Science and Health, Western Sydney University, Campbelltown, New South Wales, Australia.
| | - Lucy S Chipchase
- Faculty of Health, University of Canberra, Bruce, Australian Capital Territory, Australia
| | - Siobhan M Schabrun
- School of Science and Health, Western Sydney University, Campbelltown, New South Wales, Australia
| | - Rick J Romero
- School of Science and Health, Western Sydney University, Campbelltown, New South Wales, Australia
| | - Paul W M Marshall
- School of Science and Health, Western Sydney University, Campbelltown, New South Wales, Australia
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Sousa ASP, Silva M, Gonzalez S, Santos R. Bilateral compensatory postural adjustments to a unilateral perturbation in subjects with chronic ankle instability. Clin Biomech (Bristol, Avon) 2018; 57:99-106. [PMID: 29966961 DOI: 10.1016/j.clinbiomech.2018.06.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 05/03/2018] [Accepted: 06/23/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND To evaluate the magnitude of bilateral compensatory postural adjustments in response to a unilateral sudden inversion perturbation in subjects with chronic ankle instability. METHODS 24 athletes with chronic ankle instability (14 with functional ankle instability, 10 with mechanical ankle instability) and twenty controls participated in this study. The bilateral electromyography of ankle muscles was collected during a unilateral sudden ankle inversion to assess the magnitude of subcortical and voluntary compensatory postural adjustments in both the perturbed and the contralateral limb (support limb). FINDINGS In the support position, compared to the control group, the group with functional ankle instability presented decreased compensatory postural adjustments of the tibialis anterior in both the injured and the uninjured limbs in the support position and of the soleus in the uninjured limb. In the side of the perturbation, participants with functional ankle instability presented decreased soleus compensatory postural adjustments in the uninjured limb when compared to the control group. Increased values of soleus and peroneal brevis compensatory postural adjustments were observed in the group with mechanical instability when compared to the control group and to the group with functional ankle instability. INTERPRETATION Subjects with functional ankle instability present bilateral impairment of compensatory postural adjustments of the tibialis anterior in a support position and of the soleus of the uninjured limb regardless of the position. Subjects with mechanical instability present bilateral increase of these adjustments in the peroneal brevis regardless of the position and in the soleus muscle in the side of the perturbation.
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Affiliation(s)
- Andreia S P Sousa
- Área Científica de Fisioterapia, Escola Superior de Saúde do Porto, Instituto Politécnico do Porto, Centro de Investigação em Reabilitação - Centro de Estudos de Movimento e Atividade Humana, Rua Dr. António Bernardino de Almeida, 400, 4200-072 Porto, Portugal.
| | - Márcia Silva
- Escola Superior de Saúde do Porto, Instituto Politécnico do Porto, Centro de Investigação em Reabilitação - Centro de Estudos de Movimento e Atividade Humana, Rua Dr. António Bernardino de Almeida, 400, 4200-072 Porto, Portugal
| | - Samuel Gonzalez
- Escola Superior de Saúde do Porto, Instituto Politécnico do Porto, Centro de Investigação em Reabilitação - Centro de Estudos de Movimento e Atividade Humana, Rua Dr. António Bernardino de Almeida, 400, 4200-072 Porto, Portugal
| | - Rubim Santos
- Área Científica de Física, Escola Superior de Saúde do Porto, Instituto Politécnico do Porto, Centro de Investigação em Reabilitação - Centro de Estudos de Movimento e Atividade Humana, Rua Dr. António Bernardino de Almeida, 400, 4200-072 Porto, Portugal.
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Gago MF, Yelshyna D, Bicho E, Silva HD, Rocha L, Lurdes Rodrigues M, Sousa N. Compensatory Postural Adjustments in an Oculus Virtual Reality Environment and the Risk of Falling in Alzheimer's Disease. Dement Geriatr Cogn Dis Extra 2016; 6:252-67. [PMID: 27489559 PMCID: PMC4959436 DOI: 10.1159/000447124] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background/Aims Alzheimer's disease (AD) patients have an impaired ability to quickly reweight central sensory dependence in response to unexpected body perturbations. Herein, we aim to study provoked compensatory postural adjustments (CPAs) in a conflicting sensory paradigm with unpredictable visual displacements using virtual reality goggles. Methods We used kinematic time-frequency analyses of two frequency bands: a low-frequency band (LB; 0.3-1.5 Hz; mechanical strategy) and a high-frequency band (HB; 1.5-3.5 Hz; cognitive strategy). We enrolled 19 healthy subjects (controls) and 21 AD patients, divided according to their previous history of falls. Results The AD faller group presented higher-power LB CPAs, reflecting their worse inherent postural stability. The AD patients had a time lag in their HB CPA reaction. Conclusion The slower reaction by CPA in AD may be a reflection of different cognitive resources including body schema self-perception, visual motion, depth perception, or a different state of fear and/or anxiety.
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Affiliation(s)
- Miguel F Gago
- Neurology Department, Hospital da Senhora da Oliveira, EPE, Guimarães, Braga/Guimarães, Portugal; Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal; ICVS-3Bs PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Darya Yelshyna
- Centro ALGORITMI, Department of Industrial Electronics, School of Engineering, University of Minho, Braga, Portugal
| | - Estela Bicho
- Centro ALGORITMI, Department of Industrial Electronics, School of Engineering, University of Minho, Braga, Portugal
| | - Hélder David Silva
- Centro ALGORITMI, Department of Industrial Electronics, School of Engineering, University of Minho, Braga, Portugal
| | - Luís Rocha
- Centro ALGORITMI, Department of Industrial Electronics, School of Engineering, University of Minho, Braga, Portugal
| | - Maria Lurdes Rodrigues
- Neurology Department, Hospital da Senhora da Oliveira, EPE, Guimarães, Braga/Guimarães, Portugal
| | - Nuno Sousa
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal; ICVS-3Bs PT Government Associate Laboratory, Braga/Guimarães, Portugal
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