Directional postural responses induced by vibrotactile stimulations applied to the torso

Lee, Beom Chan; Martin, Bernard J.; Sienko, Kathleen H.

doi:10.1007/s00221-012-3233-2

Cited by 50 publications

(53 citation statements)

References 55 publications

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“…Vibrotactile stimulations were generated by six linear actuators (C2, Engineering Acoustics), herein referred to as tactors. Consistent with our previous study (Lee et al, 2012b), the tactors were placed on the skin over the areas corresponding to the left and right internal oblique (Ϯ30°), external oblique (Ϯ90°), and erector spinae (Ϯ160°) muscles at approximately the level of the L4/L5 vertebrae (note that numeric values correspond to azimuth angles relative to the sagittal plane…”

Section: Methodsmentioning

confidence: 96%

“…The latency was calculated using a 10-sample moving average (i.e., 0.1 s interval) and a threshold (͉0.3͉ degree threshold) for each trial (Lee et al, 2012c). This latency was similar (not statistically different, p Ͼ 0.05) between the covibration conditions producing postural effects (i.e., B IO and B ES) regardless of stance.…”

Section: Displacements and Joint Anglesmentioning

confidence: 99%

“…Postural modifications in response to such stimuli are frequently characterized by either center of pressure (COP) or body kinematic data; the use of only one dataset excludes the possibility of a more comprehensive examination of the postural reorganization strategy used by the CNS. Furthermore, the upright standing posture may also be modified by involuntary responses to muscle vibration applied locally to the neck (Ivanenko et al, 1999;Kavounoudias et al, 1999), knee (Edin, 2001;Collins et al, 2005), ankle (Goodwin et al, 1972;Kavounoudias et al, 2001), or whole-body segments (Martin et al, 1980). For example, dorsal neck muscle vibration induces an anterior leaning of the body, as indicated by the position of the COP (Kavounoudias et al, 1999) and kinematic measurements (Ivanenko et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…This effect is interpreted as an automatic corrective response to the CNS assumed posterior leaning of the body based on the evidence that vibration simulates a lengthening of the stimulated muscles (Goodwin et al, 1972). We recently showed that cutaneous vibration applied to the torso skin at the L4/L5 vertebrae level induces corrective directional postural shifts similar to those induced by muscle vibration (i.e., a single vibration applied to the anterior torso skin over the right internal oblique induces torso inclinations in the direction of the applied vibration azimuth) (Lee et al, 2012b). However, with one exception (Thompson et al, 2007), none of these studies simultaneously analyzed the kinematics and kinetics of postural changes to determine the relationship between postural reorganization and COP variations when sensory information is modified by vibration.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, this study tested two hypotheses as follows: (1) if changes in torso posture induced by torso vibrotactile stimulations (Lee et al, 2012b) are accompanied by a multisegmental reorganization of posture, then the COP location should be controlled to maintain balance; and (2) covibration (vibration stimuli applied simultaneously over two skin areas) applied to torso areas has a summation effect on postural responses in the absence of instructions.…”

Section: Introductionmentioning

confidence: 99%

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Postural Reorganization Induced by Torso Cutaneous Covibration

Lee¹,

Martin²,

Ho³

et al. 2013

J. Neurosci.

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Cutaneous information from joints has been attributed proprioceptive properties similar to those of muscle spindles. This study aimed to assess whether vibration-induced changes in torso cutaneous information contribute to whole-body postural reorganization in humans. Ten healthy young adults stood in normal and Romberg stances with six vibrating actuators positioned on the torso in contact with the skin over the left and right external oblique, internal oblique, and erector spinae muscle locations at the L4/L5 vertebrae level. Vibrations around the torso were randomly applied at two locations simultaneously (covibration) or at all locations simultaneously. Kinematic analysis of the body segments indicated that covibration applied to the skin over the internal oblique muscles induced shifts of both the head and torso in the anterior direction (torso flexion) while the hips shifted in the posterior direction (ankle plantar flexion). Conversely, covibration applied to the skin over the erector spinae muscle locations produced opposite effects. However, covibration applied to the skin over the left internal oblique and left erector spinae, the right internal oblique and right erector spinae, or at all locations simultaneously did not induce any significant postural changes. In addition, the center of pressure position as measured by the force plate was unaffected by all covibration conditions tested. These results were independent of stance and suggest an integrated and coordinated reorganization of posture in response to vibration-induced changes in cutaneous information. In addition, combinations of vibrotactile stimuli over multiple locations exhibit directional summation properties in contrast to the individual responses we observed in our previous work.

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Section: Methodsmentioning

confidence: 96%

Section: Displacements and Joint Anglesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Postural Reorganization Induced by Torso Cutaneous Covibration

Lee¹,

Martin²,

Ho³

et al. 2013

J. Neurosci.

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A cutaneous positioning system

2015

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Our previous work revealed that torso cutaneous information contributes to the internal representation of the torso and plays a role in postural control. Hence, the aims of this study were to assess whether posture could be manipulated by patterns of vibrotactile stimulation and to determine whether resulting modified postures were associated with specific and consistent spatial attitudes. Ten healthy young adults stood in normal and Romberg stances with six vibrating actuators positioned on the torso in contact with the skin over the anatomical locations corresponding to left and right external oblique, internal oblique and erector spinae muscles at the L4/L5 vertebrae level. A 250-Hz tactile vibration was applied for 5 s either at a single location or consecutively at each location in clockwise or counterclockwise sequences. Kinematic analysis of the body segments indicated that postural responses observed in response to single and sequential stimulation patterns were similar, while the center of pressure remained unaltered in any situations. Moreover, torso inclinations followed rectilinear-like path segments chartered by stimuli loci during sequential stimulations. Comparison of torso attitudes with previous results obtained with co-vibration patterns of the same duration showed that torso inclination amplitudes are equivalent for single (one location) and co-vibration (pairs of locations) patterns inducing the same directional effect. Hence, torso cutaneous information exhibits kinesthetic properties, appears to provide a map of upper body spatial configuration, and could assume the role of an internal positioning system for the upper body.

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Low back skin sensitivity has minimal impact on active lumbar spine proprioception and stability in healthy adults

Beaudette

Larson

et al. 2016

Exp Brain Res

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The purpose of the current work was to (1) determine whether low back cutaneous sensitivity could be reduced through the use of a topical lidocaine-prilocaine anesthetic (EMLA(®)) to mirror reductions reported in chronic lower back pain (CLBP) patients, as well as to (2) identify whether reductions in cutaneous sensitivity resulted in decreased lumbar spine proprioception, neuromuscular control and dynamic stability. Twenty-eight healthy participants were divided equally into matched EMLA and PLACEBO treatment groups. Groups completed cutaneous minimum monofilament and two-point discrimination (TPD) threshold tests, as well as tests of sagittal and axial lumbar spine active repositioning error, seated balance and repeated lifting dynamic stability. These tests were administered both before and after the application of an EMLA or PLACEBO treatment. Results show that low back minimum monofilament and TPD thresholds were significantly increased within the EMLA group. Skin sensitivity remained unchanged in the PLACEBO group. In the EMLA group, decreases in low back cutaneous sensitivity had minimal effect on low back proprioception (active sagittal and axial repositioning) and dynamic stability (seated balance and repeated lifting). These findings demonstrate that treating the skin of the low back with an EMLA anesthetic can effectively decrease the cutaneous sensitivity of low back region. Further, these decreases in peripheral cutaneous sensitivity are similar in magnitude to those reported in CLBP patients. Within this healthy population, decreased cutaneous sensitivity of the low back region has minimal influence on active lumbar spine proprioception, neuromuscular control and dynamic stability.

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Directional postural responses induced by vibrotactile stimulations applied to the torso

Cited by 50 publications

References 55 publications

Postural Reorganization Induced by Torso Cutaneous Covibration

Postural Reorganization Induced by Torso Cutaneous Covibration

A cutaneous positioning system

Low back skin sensitivity has minimal impact on active lumbar spine proprioception and stability in healthy adults

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