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Sex differences in the association of postural control with indirect measures of body representations. Sci Rep 2022; 12:4556. [PMID: 35296686 PMCID: PMC8927351 DOI: 10.1038/s41598-022-07738-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 02/01/2022] [Indexed: 12/21/2022] Open
Abstract
Besides anthropometric variables, high-order body representations have been hypothesised to influence postural control. However, this has not been directly tested before. Moreover, some studies indicate that sex moderates the relationship of anthropometry and postural control. Therefore, as a proof of concept we investigated the association of body representations with postural control as well as the influence of participants’ sex/gender. Body image measures were assessed with a figural drawing task. Body schema was tested by a covert and an overt task. Body sway was measured during normal bipedal quiet standing with eyes closed (with/without neck extended). Statistical analysis consisted of hierarchical multiple linear regressions with the following regression steps: (1) sensory condition, (2) sex/gender, (3) age, (4) anthropometry, (5) body schema, (6) body image, (7) sex/gender-interactions. Across 36 subjects (19 females), body schema was significantly associated with body sway variability and open-loop control, in addition to commonly known influencing factors, such as sensory condition, gender, age and anthropometry. While in females, also body image dissatisfaction substantially was associated with postural control, this was not the case in males. Sex differences and possible causes why high-order body representations may influence concurrent sensorimotor control of body sway are discussed.
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Baillet H, Leroy D, Vérin E, Delpouve C, Boulanger J, Benguigui N, Komar J, Thouvarecq R. Effects of practice on a mechanical horse with an online feedback on performing a sitting postural coordination. PLoS One 2020; 15:e0236205. [PMID: 33095774 PMCID: PMC7584198 DOI: 10.1371/journal.pone.0236205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 10/07/2020] [Indexed: 11/24/2022] Open
Abstract
The present research aims at quantifying the impact of practicing a new coordination pattern with an online visual feedback on the postural coordination performed on a mechanical horse. Forty-four voluntary participants were recruited in this study. They were randomly assigned to four practice groups based on i) with or without feedback (i.e., group 1, control, did not receive the feedback; group 2, 3 and 4 received an online feedback during practice) and ii) the specific trunk/horse coordination to target during practice (group 1, target coordination = 180° (without feedback); group 2, target coordination = 0°; group 3, target coordination = 90°; group 4, target coordination = 180°). All participants performed pre-, practice, post- and retention sessions. The pre-, post- and retention sessions consisted of four trials, with one trial corresponding to one specific target coordination to maintain between their own oscillations and the horse oscillations (spontaneous, 0°, 90°, and 180°). The practice phase was composed of three different sessions during which participants received an online feedback about the coordination between their own oscillations and the horse oscillations. Results showed a significant change with practice in the trunk/horse coordination patterns which persisted even after one month (retention-test). However, all the groups did not show the same nature of change, evidenced by a high postural variability during post-test for 0° and 90° target coordination groups, in opposition to the 180° and spontaneous groups who showed a decrease in coordination variability for the 180° group. The coordination in anti-phase was characterized as spontaneously adopted by participants on the mechanical horse, explaining the ease of performing this coordination (compared to the 0° and 90° target coordination). The effect of online visual feedback appeared not only on the coordination pattern itself, but most importantly on its variability during practice, including concerning initially stable coordination patterns.
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Affiliation(s)
| | - David Leroy
- Normandie Univ, UNIROUEN, CETAPS, Rouen, France
| | - Eric Vérin
- Normandie Univ, UNIROUEN, Rouen, France
- Rouen University Hospital, Rouen, France
| | - Claire Delpouve
- CRMPR Les Herbiers Rehabilitation Center, Bois-Guillaume, France
| | | | | | - John Komar
- National Institute of Education Nanyang Technological University, Singapore, Singapore
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Harrison SJ, Kinsella-Shaw JM, Dotov D. Effects of footedness and stance asymmetry confirm an inter-leg metastable coordination dynamics of standing posture. J Mot Behav 2020; 53:135-156. [PMID: 32208833 DOI: 10.1080/00222895.2020.1740151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
We investigated the patterns of coordination between the left and right legs that support the task of maintaining an upright standing posture. We used cross-wavelet analyses to assess coordination between the centers of pressure under the left and right feet. We recruited participants with a lateralized functional preference for their right leg, and we manipulated whether these participants stood with symmetric/asymmetric stances and whether their eyes were open or closed. Our hypotheses were derived from the Haken-Kelso-Bunz (HKB) model of interlimb coordination dynamics. Consistent with HKB model predictions, we observed (1) coordination taking the form of metastable, transient epochs of stable phase relations, (2) preferences for in-phase and anti-phase coordination patterns, and (3) changes in pattern stability and phase leads associated with both stance asymmetry and right-side lateral preference. The form and stability of observed coordination patterns were mediated by the availability of visual information. Our findings confirm the existence of a metastable coordination dynamic associated with the task of maintaining upright stance. We discuss the implications of these findings in the context of evaluating the utility of the HKB model for understanding the functional organization of the posture system.
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Affiliation(s)
- Steven J Harrison
- Doctor of Physical Therapy Program, Department of Kinesiology, University of Connecticut, Mansfield, Connecticut, USA.,Center for the Ecological Study of Perception and Action, Department of Psychological Sciences, University of Connecticut, Mansfield, Connecticut, USA
| | - Jeffrey M Kinsella-Shaw
- Doctor of Physical Therapy Program, Department of Kinesiology, University of Connecticut, Mansfield, Connecticut, USA.,Center for the Ecological Study of Perception and Action, Department of Psychological Sciences, University of Connecticut, Mansfield, Connecticut, USA
| | - Dobromir Dotov
- LIVELab, Psychology, Neuroscience and Behavior, McMaster University, Hamilton, Ontario, Canada.,RHPCS, McMaster University, Hamilton, Ontario, Canada
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Baillet H, Leroy D, Vérin E, Delpouve C, Benguigui N, Komar J, Thouvarecq R. Effect of Mechanical Horse Practice as New Postural Training in Patients With Neurological Disorders: A Pilot Study. Front Psychol 2019; 10:1035. [PMID: 31133944 PMCID: PMC6517495 DOI: 10.3389/fpsyg.2019.01035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 04/23/2019] [Indexed: 11/16/2022] Open
Abstract
Objective: From a dynamic system approach, this study evaluated the impact of a new training protocol using a mechanical horse on the postural coordination of brain-damaged patients. Methods: Eighteen volunteer brain-damaged patients (i.e., post-stroke or traumatic brain injury) were recruited and randomly divided into an experimental group (horse group; n = 10, conventional therapy associated with horse-riding exercise on the mechanical horse for 30 min, twice a week, for 12 weeks) and a control group (n = 8; conventional therapy without intervention on the mechanical horse). Postural coordination was evaluated during pre- and post-tests through discrete relative phase (DRP) computation: ϕHead−Horse, ϕTrunk−Horse. Results: A significant effect of used training has been showed, F(1, 15) = 16.6 (p < 0.05) for all patients, concerning the trunk/horse coordination. Conclusion: This pilot study results showed the impact of this new training method on the postural coordination of these patients. After 24 sessions, the coordination of the horse group patients differed from that of the control group, showing their ability to adapt to constraints and develop specific modes of postural coordination (trunk/horse antiphase) to optimize their posture.
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Affiliation(s)
| | - David Leroy
- Normandie Univ, UNIROUEN, CETAPS, Rouen, France
| | - Eric Vérin
- Normandie Univ, UNIROUEN, GRHV EA 3830, Rouen, France.,Rouen University Hospital, Rouen, France
| | - Claire Delpouve
- CRMPR Les Herbiers Rehabilitation Center, Bois-Guillaume, France
| | | | - John Komar
- National Institute of Education, Nanyang Technological University, Singapore, Singapore
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Standing or swaying to the beat: Discrete auditory rhythms entrain stance and promote postural coordination stability. Gait Posture 2018; 59:28-34. [PMID: 28985578 DOI: 10.1016/j.gaitpost.2017.09.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 09/18/2017] [Accepted: 09/21/2017] [Indexed: 02/02/2023]
Abstract
Humans seem to take social and behavioral advantages of entraining themselves with discrete auditory rhythms (e.g., dancing, communicating). We investigated the benefits of such an entrainment on posture during standing (spontaneous entrainment) and during a whole-body swaying task (intentional synchronization). We first evaluated how body sway was entrained by different auditory metronome frequencies (0.25, 0.5, and 1.0Hz). We then assessed the stabilizing role of auditory rhythms on postural control, characterized in a dynamical systems perspective by informational anchoring of the head (local stabilization) and fewer transitions from in-phase to anti-phase ankle-hip coordination (global stabilization). Our results revealed in both situations an entrainment of postural movements by external rhythms. This entrainment tended to be more effective when the metronome frequency (0.25Hz) was close to the dominant sway frequency. Particularly, we found during intentional synchronization that head movements were less variable when paced by a slower beat (informational anchoring), and that phase transitions between the two stable patterns in postural dynamics were delayed. Our findings demonstrate that human bipedal posture can be actively or spontaneously modulated by an external discrete auditory rhythm, which might be exploited for the purpose of learning and rehabilitation.
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Wade MG, Kazeck M. Developmental coordination disorder and its cause: The road less travelled. Hum Mov Sci 2016; 57:489-500. [PMID: 27876401 DOI: 10.1016/j.humov.2016.08.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 08/05/2016] [Accepted: 08/12/2016] [Indexed: 10/20/2022]
Abstract
We critically review the research literature that seeks to focus on the possible cause of children diagnosed with developmental coordination disorder (DCD). In so doing we contrast the traditional information processing (IP) approach as a model to explain the causal factors that account for the motor deficits present in children with DCD, with a dynamical systems (DS) account which argues that coordination deficits in children with DCD is less to do with problems of poor internal models (a cornerstone of IP theory) and more with a degrading of perception-action coupling. We review and comment on the extant empirical data and conclusions of both approaches. We conclude that the data for an IP explanation is weak and a reconsideration of DCD is in order with respect to the underlying cause of this issue.
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Affiliation(s)
- Michael G Wade
- School of Kinesiology, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Makinzee Kazeck
- School of Kinesiology, University of Minnesota, Minneapolis, MN 55455, USA
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Krukowska J, Bugajski M, Sienkiewicz M, Czernicki J. The influence of NDT-Bobath and PNF methods on the field support and total path length measure foot pressure (COP) in patients after stroke. Neurol Neurochir Pol 2016; 50:449-454. [PMID: 27585746 DOI: 10.1016/j.pjnns.2016.08.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 08/10/2016] [Indexed: 11/17/2022]
Abstract
In stroke patients, the NDT - (Bobath - Neurodevelopmental Treatment) and PNF (Proprioceptive Neuromuscular Facilitation) methods are used to achieve the main objective of rehabilitation, which aims at the restoration of maximum patient independence in the shortest possible period of time (especially the balance of the body). The aim of the study is to evaluate the effect of the NDT-Bobath and PNF methods on the field support and total path length measure foot pressure (COP) in patients after stroke. The study included 72 patients aged from 20 to 69 years after ischemic stroke with Hemiparesis. The patients were divided into 4 groups by a simple randomization. The criteria for this division were: the body side (right or left) affected by paresis and the applied rehabilitation methods. All the patients were applied the recommended kinesitherapeutic method (randomized), 35 therapy sessions, every day for a period of six weeks. Before initiation of therapy and after 6 weeks was measured the total area of the support and path length (COP (Center Of Pressure) measure foot pressure) using stabilometer platform - alpha. The results were statistically analyzed. After treatment studied traits decreased in all groups. The greatest improvement was obtained in groups with NDT-Bobath therapy. NDT-Bobath method for improving the balance of the body is a more effective method of treatment in comparison with of the PNF method. In stroke patients, the effectiveness of NDT-Bobath method does not depend on hand paresis.
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Affiliation(s)
- Jolanta Krukowska
- Physiotherapy Laboratory, Department of Physical Medicine, Medical University of Lodz, Lodz, Poland; Faculty of Pedagogy and Health Promotion, Some College of Informatics and Skills of Lodz, Lodz, Poland.
| | - Marcin Bugajski
- Department of Rehabilitation, Medical University of Lodz, Lodz, Poland.
| | - Monika Sienkiewicz
- Department of Allergology and Respiratory Rehabilitation, Medical University of Lodz, Lodz, Poland.
| | - Jan Czernicki
- Physiotherapy Laboratory, Department of Physical Medicine, Medical University of Lodz, Lodz, Poland.
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Bonnet V, Venture G. Fast Determination of the Planar Body Segment Inertial Parameters Using Affordable Sensors. IEEE Trans Neural Syst Rehabil Eng 2015; 23:628-35. [DOI: 10.1109/tnsre.2015.2405087] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Varlet M, Schmidt RC, Richardson MJ. Influence of Internal and External Noise on Spontaneous Visuomotor Synchronization. J Mot Behav 2015; 48:122-31. [PMID: 26046969 DOI: 10.1080/00222895.2015.1050548] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Historically, movement noise or variability is considered to be an undesirable property of biological motor systems. In particular, noise is typically assumed to degrade the emergence and stability of rhythmic motor synchronization. Recently, however, it has been suggested that small levels of noise might actually improve the functioning of motor systems and facilitate their adaptation to environmental events. Here, the authors investigated whether noise can facilitate spontaneous rhythmic visuomotor synchronization. They examined the influence of internal noise in the rhythmic limb movements of participants and external noise in the movement of an oscillating visual stimulus on the occurrence of spontaneous synchronization. By indexing the natural frequency variability of participants and manipulating the frequency variability of the visual stimulus, the authors demonstrated that both internal and external noise degrade synchronization when the participants' and stimulus movement frequencies are similar, but can actually facilitate synchronization when the frequencies are different. Furthermore, the two kinds of noise interact with each other. Internal noise facilitates synchronization only when external noise is minimal and vice versa. Too much internal and external noise together degrades synchronization. These findings open new perspectives for better understanding the role of noise in human rhythmic coordination.
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Affiliation(s)
- Manuel Varlet
- a The MARCS Institute, University of Western Sydney , Australia.,b Perceptual-Motor Dynamics Laboratory, CAP Center for Cognition, Action, and Perception, University of Cincinnati , Ohio.,c Movement to Health Laboratory, EuroMov, Montpellier-1 University , France
| | - R C Schmidt
- d Department of Psychology , College of the Holy Cross , Worcester , Massachusetts
| | - Michael J Richardson
- b Perceptual-Motor Dynamics Laboratory, CAP Center for Cognition, Action, and Perception, University of Cincinnati , Ohio
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Varlet M, Marin L, Capdevielle D, Del-Monte J, Schmidt RC, Salesse RN, Boulenger JP, Bardy BG, Raffard S. Difficulty leading interpersonal coordination: towards an embodied signature of social anxiety disorder. Front Behav Neurosci 2014; 8:29. [PMID: 24567707 PMCID: PMC3915144 DOI: 10.3389/fnbeh.2014.00029] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Accepted: 01/20/2014] [Indexed: 12/03/2022] Open
Abstract
Defined by a persistent fear of embarrassment or negative evaluation while engaged in social interaction or public performance, social anxiety disorder (SAD) is one of the most common psychiatric syndromes. Previous research has made a considerable effort to better understand and assess this mental disorder. However, little attention has been paid to social motor behavior of patients with SAD despite its crucial importance in daily social interactions. Previous research has shown that the coordination of arm, head or postural movements of interacting people can reflect their mental states or feelings such as social connectedness and social motives, suggesting that interpersonal movement coordination may be impaired in patients suffering from SAD. The current study was specifically aimed at determining whether SAD affects the dynamics of social motor coordination. We compared the unintentional and intentional rhythmic coordination of a SAD group (19 patients paired with control participants) with the rhythmic coordination of a control group (19 control pairs) in an interpersonal pendulum coordination task. The results demonstrated that unintentional social motor coordination was preserved with SAD while intentional coordination was impaired. More specifically, intentional coordination became impaired when patients with SAD had to lead the coordination as indicated by poorer (i.e., more variable) coordination. These differences between intentional and unintentional coordination as well as between follower and leader roles reveal an impaired coordination dynamics that is specific to SAD, and thus, opens promising research directions to better understand, assess and treat this mental disorder.
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Affiliation(s)
- Manuel Varlet
- Movement to Health Laboratory, EuroMov, Montpellier 1 University Montpellier, France ; The MARCS Institute, University of Western Sydney Sydney, NSW, Australia
| | - Ludovic Marin
- Movement to Health Laboratory, EuroMov, Montpellier 1 University Montpellier, France
| | - Delphine Capdevielle
- University Department of Adult Psychiatry, Hôpital de la Colombière, CHU Montpellier, Montpellier 1 University Montpellier, France ; INSERM U-888 Montpellier, France
| | - Jonathan Del-Monte
- Movement to Health Laboratory, EuroMov, Montpellier 1 University Montpellier, France ; University Department of Adult Psychiatry, Hôpital de la Colombière, CHU Montpellier, Montpellier 1 University Montpellier, France ; Epsylon, Laboratory Dynamic of Human Abilities & Health Behaviors, Department of Sport Sciences, Psychology and Medicine, University of Montpellier & St-Etienne France
| | - R C Schmidt
- Department of Psychology, College of the Holy Cross Worcester, MA, USA
| | - Robin N Salesse
- Movement to Health Laboratory, EuroMov, Montpellier 1 University Montpellier, France
| | - Jean-Philippe Boulenger
- University Department of Adult Psychiatry, Hôpital de la Colombière, CHU Montpellier, Montpellier 1 University Montpellier, France ; INSERM U-888 Montpellier, France
| | - Benoît G Bardy
- Movement to Health Laboratory, EuroMov, Montpellier 1 University Montpellier, France ; Institut Universitaire de France Paris, France
| | - Stéphane Raffard
- University Department of Adult Psychiatry, Hôpital de la Colombière, CHU Montpellier, Montpellier 1 University Montpellier, France ; Epsylon, Laboratory Dynamic of Human Abilities & Health Behaviors, Department of Sport Sciences, Psychology and Medicine, University of Montpellier & St-Etienne France
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Lee SW, Cho KH, Lee WH. Effect of a local vibration stimulus training programme on postural sway and gait in chronic stroke patients: a randomized controlled trial. Clin Rehabil 2013; 27:921-31. [DOI: 10.1177/0269215513485100] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective: To investigate the effect of a local vibration stimulus training programme on postural sway and gait in stroke patients. Design: A randomized controlled trial with two groups: a local vibration stimulus training programme group and a sham group. Setting: Inpatient rehabilitation centre. Subjects: Thirty-one chronic stroke patients. Interventions: Both groups underwent a standard rehabilitation programme. The local vibration stimulus training programme group ( n = 16) participated in the local vibration stimulus training programme for 30 minutes a day, five times a week, for six weeks. The sham group ( n = 15) participated in a sham local vibration stimulus training programme for 30 minutes a day, five times a week, for six weeks. Main measures: A forceplate was used to measure postural sway under two conditions: standing with eyes open and eyes closed. Gait ability was measured using the GAITRite system. Results: In postural sway, greater improvements in the postural sway distance with eyes-open (–11.91 vs. 0.80) and eyes-closed (–20.67 vs. –0.34) conditions and postural sway velocity with eyes-open (–0.40 vs. 0.03) and eyes-closed (–0.69 vs. –0.01) conditions were observed in the local vibration stimulus training programme group, compared with the sham group ( P < 0.05). In gait ability, greater improvement in gait speed (15.06 vs. 2.85), cadence (8.46 vs. 1.55), step length (7.90 vs. 3.64), and single limb support time (0.12 vs. 0.01) were observed in the local vibration stimulus training programme group, compared with the sham group ( P < 0.05). Conclusions: These findings suggest that local vibration stimulus training programme is an effective method for improvement of the postural sway and gait ability of chronic stroke patients.
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Affiliation(s)
- Se-Won Lee
- Department of Physical Therapy, Sahmyook University, Republic of Korea
| | - Ki-Hun Cho
- Department of Physical Therapy, Sahmyook University, Republic of Korea
| | - Wan-Hee Lee
- Department of Physical Therapy, Sahmyook University, Republic of Korea
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Stoffregen TA, Chen FC, Varlet M, Alcantara C, Bardy BG. Getting Your Sea Legs. PLoS One 2013; 8:e66949. [PMID: 23840560 PMCID: PMC3686767 DOI: 10.1371/journal.pone.0066949] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Accepted: 05/10/2013] [Indexed: 11/27/2022] Open
Abstract
Sea travel mandates changes in the control of the body. The process by which we adapt bodily control to life at sea is known as getting one's sea legs. We conducted the first experimental study of bodily control as maritime novices adapted to motion of a ship at sea. We evaluated postural activity (stance width, stance angle, and the kinematics of body sway) before and during a sea voyage. In addition, we evaluated the role of the visible horizon in the control of body sway. Finally, we related data on postural activity to two subjective experiences that are associated with sea travel; seasickness, and mal de debarquement. Our results revealed rapid changes in postural activity among novices at sea. Before the beginning of the voyage, the temporal dynamics of body sway differed among participants as a function of their (subsequent) severity of seasickness. Body sway measured at sea differed among participants as a function of their (subsequent) experience of mal de debarquement. We discuss implications of these results for general theories of the perception and control of bodily orientation, for the etiology of motion sickness, and for general phenomena of perceptual-motor adaptation and learning.
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Affiliation(s)
- Thomas A. Stoffregen
- Affordance Perception-Action Laboratory, University of Minnesota, Minneapolis, Minnesota, United States of America
- * E-mail:
| | - Fu-Chen Chen
- Department of Recreation Sport & Health Promotion, National Pingtung University of Science and Technology, Pingung, Taiwan
| | - Manuel Varlet
- Movement to Health Laboratory, EuroMov, University of Montpellier-1, Montpellier, France
| | - Cristina Alcantara
- Escola de Educação Física e Esporte, Universidade de São Paulo, São Paulo, Brazil
| | - Benoît G. Bardy
- Movement to Health Laboratory, EuroMov, University of Montpellier-1, Montpellier, France
- Institut Universitaire de France, Paris, France
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Carneiro JAO, Santos-Pontelli TEG, Colafêmina JF, Carneiro AAO, Ferriolli E. A pilot study on the evaluation of postural strategies in young and elderly subjects using a tridimensional electromagnetic system. Braz J Otorhinolaryngol 2013; 79:219-25. [PMID: 23670329 PMCID: PMC9443874 DOI: 10.5935/1808-8694.20130038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2012] [Accepted: 12/29/2012] [Indexed: 11/20/2022] Open
Abstract
Abstract One resorts to various postural strategies while attempting to maintain balance. Objective To assess the postural strategies adopted by young and elderly subjects in varying sensory conditions by using a system of tridimensional electromagnetic sensors positioned on the projection of the first thoracic vertebra and on the sacral region. Postural oscillation values for young and elderly subjects were also reported. Method This observational cross-sectional study enrolled 25 young and 16 elderly individuals. A Polhemus™ device equipped with two sensors was used to assess postural oscillation parameters (maximum displacement, mean velocity, and trajectory). Data acquisition was carried out with subjects standing while undergoing a 90-second test in four sensory conditions: eyes opened, eyes closed, on a stable surface, and on an unstable surface. Results Sensors 1 and 2 presented significant cross-correlations in all sensory conditions for both groups (r > 0.99; p < 0.001). No statistically significant differences were seen when the cross-correlations for both groups were compared. Conclusion This study presented an important tool to analyze postural oscillation and assess the postural strategies of young and elderly subjects in different sensory conditions. Young and elderly individuals presented strong correlations between sensors (ankle strategy), but no statistically significant differences were seen between groups.
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Rougier PR, Boudrahem S. How additional visual feedback of the movements between center of pressure and vertically projected center of gravity can be used by hemiparetic patients. Top Stroke Rehabil 2012; 19:1-12. [PMID: 22306623 DOI: 10.1310/tsr1901-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE In healthy adults, the beneficial effect of providing additional visual feedback (VFB) with a delay of either the center of pressure (CP) or the difference between CP movements and center of gravity (CP-CGv) movements was previously demonstrated and explained by their capacity to decrease their CP-CGv movements. The present study seeks to demonstrate whether similar trends could be observed in hemiparetic patients. METHODS Posturographic measurements were recorded in 56 hemiparetic patients in 3 VFB conditions: (1) CP in real time (VFBCP0), (2) CP with a 600-ms delay (VFBCP600), and (3) CP-CGv with a 600-ms delay (VFBCP-CG600). A condition without VFB (eyes open [EO]) was also included. The individual capacity to lower CP-CGv movements as compared to the reference VFBCP0 condition was assessed using dependency coefficients (ie, average surface covered by the CP-CGv displacements in an experimental condition relative to the VFBCP0 condition) in the VFBCP600, VFBCP-CG600, and EO conditions. RESULTS Reduced CP-CGv movements were only obtained for half of the patients for the conditions with delay or without VFB. Significant linear correlations revealed that the most successful patients are characterized by reduced CP-CGv movements in these conditions and in the EO condition. In contrast, a poor correlation was found with the patients' clinical scores. CONCLUSION Based on the behavioral profile of a patient able to use these VFB techniques effectively, this study emphasizes the complementary nature of the various conditions proposed by the VFB technique and provides insights for establishing rehabilitation protocols based on this VFB technique.
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Affiliation(s)
- Patrice R Rougier
- Laboratoire de Physiologie de l'Exercice, Université de Savoie, Le Bourget du Lac, France
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