Muscular Response to Sudden Load: A Tool to Evaluate Fatigue

Wilder, David G.; Aleksiev, A.; Magnusson, Marianne; Pope, Malcolm H.; Spratt, Kevin F.; Goel, Vijay K.

doi:10.1177/026309239801700205

Cited by 80 publications

(124 citation statements)

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“…In the literature, experiments on sudden loading dynamics have delays in muscle response ranging from 127 to 205ms depending on the measurement method (Granata, Slota, & Wilson, 2004;Lavender, Marras, & Miller, 1993;Wilder et al, 1996). Two factors contribute to the slightly longer times observed in this study.…”

Section: Discussionmentioning

confidence: 69%

Whole-body vibration alters proprioception in the trunk

Li¹,

Lamis²,

Wilson³

2008

International Journal of Industrial Ergonomics

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Abstract:Occupational whole body vibration has long been associated with low back injuries.However, the mechanism of these injuries is not well understood. In this paper, the effect of whole body vibration on proprioception and dynamic stability was examined. Subjects exposed to 20 minutes of vertical, seated, whole body vibration were found to have a 1.58 fold increase in position sense errors after vibration relative to controls exposed to 20 minutes of the same seated posture without vibration exposure. To understand the potential effect of a sensory loss on dynamic low back stability a lumped parameter model of the trunk and neuromotor response was created. Using this model, an increase in the threshold of the sensory system was predicted to increase trunk flexion and delay neuromotor response with a sudden, unexpected perturbation. These predictions were demonstrated in a second experiment where subjects exhibited both an 11.9% increase in trunk flexion and an 11.2% increase in time to peak paraspinal muscle response (measured using integrated electromyographic activity) after exposure to 20 minutes of vertical, seated, whole body vibration.

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Section: Discussionmentioning

confidence: 69%

Whole-body vibration alters proprioception in the trunk

Li¹,

Lamis²,

Wilson³

2008

International Journal of Industrial Ergonomics

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“…Other studies employing loading perturbations have also documented alterations in neuromuscular control for subjects with LBP [18,32]. In response to horizontal support surface perturbations, subjects with chronic LBP [15], and episodic LBP [11] have been found to demonstrate a decrease in the magnitude of center of mass displacement and a delayed onset of net center of pressure displacement.…”

Section: Discussionmentioning

confidence: 99%

“…Three general aspects of altered muscle recruitment patterns in people with back pain have been investigated: (1) altered muscle activation patterns, especially coactivation, in a static task such as pulling against a fixed object or slow lifting [1,3,19,20,28], (2) altered muscle reflex latency times in response to a sudden perturbation [26] or dropped weight [18,32], quick release of trunk loading [27], or moving support platform [10], (3) altered muscle activation pattern in anticipation of an unexpected or voluntary perturbation [14,25].…”

Section: Introductionmentioning

confidence: 99%

“…The degree of stability of the trunk with a given external loading, and a known muscle activation pattern can be quantified with the help of models that analyze the potential energy of the trunk [5,7]. Experimentally, buckling instability cannot be induced by a perturbation, but the amount of trunk excursions (stiffness) [4,8,9] and/or the magnitude and timing of muscular response to a perturbation [18,32] can be recorded. Persons with LBP might respond differently to the anticipation of the perturbation, or to the actual perturbation.…”

Section: Introductionmentioning

confidence: 99%

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Trunk muscular activation patterns and responses to transient force perturbation in persons with self-reported low back pain

2005

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Trunk stability requires muscle stiffness associated with appropriate timing and magnitude of activation of muscles. Abnormality of muscle function has been implicated as possible cause or consequence of back pain. This experimental study compared trunk muscle activation and responses to transient force perturbations in persons with and without self-reported history of low back pain. The objective was to determine whether or not history of back pain was associated with (1) altered anticipatory preactivation of trunk muscles or altered likelihood of muscular response to a transient force perturbation and (2) altered muscle activation patterns during a ramped effort. Twenty-one subjects who reported having back pain (LBP group) and twenty-three reporting no recent back pain (NLBP group) were tested while each subject stood in an apparatus with the pelvis immobilized. They performed 'ramped-effort' tests (to a voluntary maximum effort), and force perturbation tests. Resistance was provided by a horizontal cable from the thorax to one of five anchorage points on a wall track to the subject's right at angles of 0°, 45°, 90°, 135°and 180°to the forward direction. In the perturbation tests, subjects first pulled against the cable to generate an effort nominally 15% or 30% of their maximum extension effort. The effort and the EMG activity of five right/left pairs of trunk muscles were recorded, and muscle responses were detected. In the ramped-effort tests the gradient of the EMG-effort relationship provided a measure of each muscle's activation. On average, the LBP group subjects activated their dorsal muscles more than the NLBP group subjects in a maximum effort task when the EMG values were normalized for the maximum EMG, but this finding may have resulted from lesser maximum effort generated by LBP subjects. Greater muscle preactivation was recorded in the LBP group than the NLBP group just prior to the perturbation. The likelihood of muscle responses to perturbations was not significantly different between the two groups. The findings were consistent with the hypothesis that LBP subjects employed muscle activation in a quasistatic task and preactivation prior to a perturbation in an attempt to stiffen and stabilize the trunk. However, interpretation of the findings was complicated by the fact that LBP subjects generated lesser efforts, and it was not known whether this resulted from anatomical differences (e.g., muscle atrophy) or reduced motivation (e.g., pain avoidance).

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confidence: 99%

Neuromotor Transmissibility of Horizontal Seatpan Vibration and a Mathematical Model

Reddy

Channamallu

Wilson

2010

Proceedings of the Third American Conference on Human Vibration, June 1-4, 2010

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IntroductionRecent studies of whole body vibration in seated postures have suggested that the neuromotor system may play a role in the etiology of low back disorders [1][2][3][4] . A number of researchers have modeled whole body vibration transmission to the low back, spine and head 5 . However, no model to our knowledge has examined the transmission of mechanical vibration to muscle shortening/lengthening, the neuromotor system and reflex muscle activation. In addition, only a few studies have examined biodynamic vibration transmission in the fore-aft (anterior-posterior) direction. In this work, transmission of fore-aft vibration to the spine rotation and erector spinae muscle activation was assessed and a model of the motion was created.

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Muscular Response to Sudden Load: A Tool to Evaluate Fatigue

Cited by 80 publications

References 0 publications

Whole-body vibration alters proprioception in the trunk

Whole-body vibration alters proprioception in the trunk

Trunk muscular activation patterns and responses to transient force perturbation in persons with self-reported low back pain

Neuromotor Transmissibility of Horizontal Seatpan Vibration and a Mathematical Model

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