Adaptation of Postural Reactions in Seated Positions and Influence of Head Posture when Exposed to a Single Sideway Perturbation: Relevance for Driving on Irregular Terrain

Stenlund, TC

doi:10.17352/2455-5487.000031

Cited by 2 publications

(2 citation statements)

References 26 publications

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“…decreased neck muscle activity due to repeated external perturbations have been proven. (Blouin et al 2003;Siegmund et al 2003;Stenlund et al 2016) On the other hand, an experienced driver could as a consequence of exposure to WBV suffer from e.g. LBP that may alter the Table 5.…”

Section: Discussionmentioning

confidence: 99%

Seated postural loads caused by shock-type whole-body vibration when driving over obstacles

Stenlund

Lundström

Lindroos

et al. 2020

International Journal of Forest Engineering

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Operators of mobile machines within forestry work long hours in seated postures while being exposed to whole-body vibration (WBV) that is associated with pain in the lower back and neck. Still, little is known about the contribution from postural loads. In this study postural loads and shock-type WBV exposure on drivers operating a forwarder during terrain-like conditions was measured and quantified using inertial measurement units (IMUs). Five male drivers drove a forwarder repeatedly over standardized steel obstacles using a predefined speed and posture followed by driving over natural obstacles along a terrain course using a self-selected speed and posture. IMUs were affixed along the spine, on the back of the head of the driver and on the seat to detect orientation, velocity, and acceleration. The result shows that the methodology for measuring WBV and postural load with IMUs is feasible. Postural loads, expressed as range of motions (ROMs), when driving over a single standardized obstacle at a speed of 3.3 km/h were up to 21°in the neck segments. Increasing vehicle speed and size of obstacles increased postural loads. The terrain course resulted in higher ROMs in all body segments compared to a standardized obstacle, a difference in sideway seat acceleration but no differences regarding angular velocities of the head. Mechanical shocks at the seat were prevalent but the action limit value was exceeded only for one driver. Postural loads remained small during all conditions indicating that the spine can remain stable during exposure to shock-type WBV of this nature.

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Section: Discussionmentioning

confidence: 99%

Seated postural loads caused by shock-type whole-body vibration when driving over obstacles

Stenlund

Lundström

Lindroos

et al. 2020

International Journal of Forest Engineering

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“…With the head laterally flexed to the left, the EMG amplitude in the muscles on the right increased. The muscle onset latencies also started to adapt with increased muscle onset latencies at later repetitions when the head postures were flexed 15) . These findings suggest the advanced neuromuscular adaptation of cephalic vertebra for irregular external forces.…”

Section: "Cephalic Vertebra"mentioning

confidence: 99%

<i>Cone of Economy with the Chain of Balance</i>-Historical Perspective and Proof of Concept

Hara¹,

Dubousset

2022

Spine Surg Relat Res

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A bipedal erect posture with a horizontal gaze is a distinctly human characteristic. The standing mechanism was described by Jean Felix Dubousset in the early 1970s as the "cone of economy," in which the axial skeleton is aligned in balance with the feet, lower limbs, and pelvis (pelvic vertebra) to the spinal segments, ending with the cranium (cephalic vertebra). All the components act in concert, allowing for adaptive motion in all directions on the horizontal plane. In a normal subject, the body maintains balance within a small "cone" using minimal muscle activity, and in a subject with pathologic lesions of the locomotor system, maintaining a standing posture requires a larger "cone" and greater muscle activity. Evidence from recent studies using the EOS imaging system, force plate measurements, surface electromyography, and fullbody reflective markers with surface electromyography have gradually consolidated the "cone of economy" concept, a fundamental hypothetical theory of human locomotion.

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Adaptation of Postural Reactions in Seated Positions and Influence of Head Posture when Exposed to a Single Sideway Perturbation: Relevance for Driving on Irregular Terrain

Cited by 2 publications

References 26 publications

Seated postural loads caused by shock-type whole-body vibration when driving over obstacles

Seated postural loads caused by shock-type whole-body vibration when driving over obstacles

<i>Cone of Economy with the Chain of Balance</i>-Historical Perspective and Proof of Concept

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