Limits...
Activation of Neck and Low-Back Muscles Is Reduced with the Use of a Neck Balance System Together with a Lumbar Support in Urban Drivers.

Menotti F, Labanca L, Laudani L, Giombini A, Pigozzi F, Macaluso A - PLoS ONE (2015)

Bottom Line: RMS of the low back muscles was lower with than without devices during both acceleration and deceleration of the vehicle (1.40±0.93% vs 29 2.32±1.90% and 1.88±1.45% vs 2.91±2.33%, respectively), while RMS of neck extensor muscles was reduced only during acceleration (5.18±1.96% vs 5.91±2.16%).There were no differences between the two conditions in RMS of neck flexor muscles, the pitch of the head and the VAS score.The use of these two ergonomic devices is therefore effective in reducing the activation of low-back and neck muscles during driving with no changes in the level of perceived comfort, which is likely due to rebalancing weight on the neck and giving a neutral position to lumbar segments.

View Article: PubMed Central - PubMed

Affiliation: Department of Movement, Human and Health Sciences, University of Rome Foro Italico, Rome, Italy.

ABSTRACT
Driving is associated with high activation of low-back and neck muscles due to the sitting position and perturbations imposed by the vehicle. The aim of this study was to investigate the use of a neck balance system together with a lumbar support on the activation of low-back and neck muscles during driving. Twelve healthy male subjects (age 32±6.71 years) were asked to drive in two conditions: 1) with devices; 2) without devices. During vehicle accelerations and decelerations root mean square (RMS) of surface electromyography (sEMG) was recorded from the erector spinae, semispinalis capitis and sternocleidomastoid muscles and expressed as a percentage of maximal voluntary contraction (MVC). The pitch of the head was obtained by means of an inertial sensor placed on the subjects' head. A visual analog scale (VAS) was used to assess the level of perceived comfort. RMS of the low back muscles was lower with than without devices during both acceleration and deceleration of the vehicle (1.40±0.93% vs 29 2.32±1.90% and 1.88±1.45% vs 2.91±2.33%, respectively), while RMS of neck extensor muscles was reduced only during acceleration (5.18±1.96% vs 5.91±2.16%). There were no differences between the two conditions in RMS of neck flexor muscles, the pitch of the head and the VAS score. The use of these two ergonomic devices is therefore effective in reducing the activation of low-back and neck muscles during driving with no changes in the level of perceived comfort, which is likely due to rebalancing weight on the neck and giving a neutral position to lumbar segments.

No MeSH data available.


Related in: MedlinePlus

Ergonomic devices: (A) Lumbar Support; (B) Neck Balance System (Natura Benessere Salute Srl, Varese, Italy).
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4608778&req=5

pone.0141031.g002: Ergonomic devices: (A) Lumbar Support; (B) Neck Balance System (Natura Benessere Salute Srl, Varese, Italy).

Mentions: The Lumbar Support consists of a polyurethane cushion placed between the vehicle seat and the low back of the subject at L3 level. The positioning of the support was adjusted according to the subjects’ height by regulating two belts, the first fastened to the headrest of the vehicle seat and the second around the back of the seat (Fig 2, panel A). The Neck Balance System is composed by a baseball type cap which contains two weights (0.2 kg each) applied at the occipital level. These two weights are inserted in two appropriate posterior pockets of the device (Fig 2, panel B). An example of the subject’s positioning during the driving trials is shown in Fig 3. Before starting each driving trial, all drivers adjusted their own seats based on personal comfort.


Activation of Neck and Low-Back Muscles Is Reduced with the Use of a Neck Balance System Together with a Lumbar Support in Urban Drivers.

Menotti F, Labanca L, Laudani L, Giombini A, Pigozzi F, Macaluso A - PLoS ONE (2015)

Ergonomic devices: (A) Lumbar Support; (B) Neck Balance System (Natura Benessere Salute Srl, Varese, Italy).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4608778&req=5

pone.0141031.g002: Ergonomic devices: (A) Lumbar Support; (B) Neck Balance System (Natura Benessere Salute Srl, Varese, Italy).
Mentions: The Lumbar Support consists of a polyurethane cushion placed between the vehicle seat and the low back of the subject at L3 level. The positioning of the support was adjusted according to the subjects’ height by regulating two belts, the first fastened to the headrest of the vehicle seat and the second around the back of the seat (Fig 2, panel A). The Neck Balance System is composed by a baseball type cap which contains two weights (0.2 kg each) applied at the occipital level. These two weights are inserted in two appropriate posterior pockets of the device (Fig 2, panel B). An example of the subject’s positioning during the driving trials is shown in Fig 3. Before starting each driving trial, all drivers adjusted their own seats based on personal comfort.

Bottom Line: RMS of the low back muscles was lower with than without devices during both acceleration and deceleration of the vehicle (1.40±0.93% vs 29 2.32±1.90% and 1.88±1.45% vs 2.91±2.33%, respectively), while RMS of neck extensor muscles was reduced only during acceleration (5.18±1.96% vs 5.91±2.16%).There were no differences between the two conditions in RMS of neck flexor muscles, the pitch of the head and the VAS score.The use of these two ergonomic devices is therefore effective in reducing the activation of low-back and neck muscles during driving with no changes in the level of perceived comfort, which is likely due to rebalancing weight on the neck and giving a neutral position to lumbar segments.

View Article: PubMed Central - PubMed

Affiliation: Department of Movement, Human and Health Sciences, University of Rome Foro Italico, Rome, Italy.

ABSTRACT
Driving is associated with high activation of low-back and neck muscles due to the sitting position and perturbations imposed by the vehicle. The aim of this study was to investigate the use of a neck balance system together with a lumbar support on the activation of low-back and neck muscles during driving. Twelve healthy male subjects (age 32±6.71 years) were asked to drive in two conditions: 1) with devices; 2) without devices. During vehicle accelerations and decelerations root mean square (RMS) of surface electromyography (sEMG) was recorded from the erector spinae, semispinalis capitis and sternocleidomastoid muscles and expressed as a percentage of maximal voluntary contraction (MVC). The pitch of the head was obtained by means of an inertial sensor placed on the subjects' head. A visual analog scale (VAS) was used to assess the level of perceived comfort. RMS of the low back muscles was lower with than without devices during both acceleration and deceleration of the vehicle (1.40±0.93% vs 29 2.32±1.90% and 1.88±1.45% vs 2.91±2.33%, respectively), while RMS of neck extensor muscles was reduced only during acceleration (5.18±1.96% vs 5.91±2.16%). There were no differences between the two conditions in RMS of neck flexor muscles, the pitch of the head and the VAS score. The use of these two ergonomic devices is therefore effective in reducing the activation of low-back and neck muscles during driving with no changes in the level of perceived comfort, which is likely due to rebalancing weight on the neck and giving a neutral position to lumbar segments.

No MeSH data available.


Related in: MedlinePlus