Natural Head Position in Standing Subjects

Solow, Beni; Tallgren, Antje

doi:10.3109/00016357109026337

Cited by 387 publications

(219 citation statements)

References 4 publications

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“…The range of ICC values (0.96-0.98) showed high intra-examiner consistency and were in accordance with results of other studies [7]. According to some authors gender could have an effect on cranio-cervical postural measures [18] and for this reason preliminary analysis of the data using an unpaired t test was undertaken to assess the possible effect of gender on the cranio-cervical postural measures. For each participant results of the paired t test were then used to compare mean changes in head and neck postural alignment between the two sets of radiographs taken in the SUP at the end of quiet expiration and then in the ST registration.…”

Section: Statistical Analysessupporting

confidence: 88%

The demands of professional opera singing on cranio-cervical posture

Johnson

Skinner

2009

Eur Spine J

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Difficulty with singing is a rare but important complication following cervical spine surgery but there is little objective information regarding the cervical and head postural changes taking place during singing. The aim of this study was to identify postural changes in the cranio-cervical region associated with the demands of voice production in professional opera singing. The two Roentgen-cephalograms, one of which are taken whilst performing a specified singing task were taken from 18 professional opera students, 12 females (mean age 20.86 ± 3.07 years) and six males (18.66 ± 1.36 years). A paired t test compared mean cranio-cervical postural and pharyngeal/hyoid variables between the two registrations (P = 0.05). The association between the craniocervical postural variables and the pharyngeal/hyoid region in each registration position was examined using Spearman's rank correlation coefficient. In singing, the position of the atlas with respect to the true vertical (P \ 0.001), the axis (P \ 0.001) and the C4 vertebra both with respect to the horizontal (P \ 0.001), and the axis with respect to the cranium (P \ 0.001), were all significantly different to those at rest. Of the cranio-cervical postural variables in the singing registration, the angles measuring positional change of the atlas and C4 relative to the true horizontal were shown be significantly related to an increased pharyngeal airway space at the C3 level (P \ 0.01). An appreciation of the requirement for the cervical spine to undergo postural change during professional opera singing has relevance to the potential impact on voice quality in professional opera singers should they undergo cervical spine surgery.

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Section: Statistical Analysessupporting

confidence: 88%

The demands of professional opera singing on cranio-cervical posture

Johnson

Skinner

2009

Eur Spine J

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“…By defining the reference positions as those obtained during standardised postures, this error will appear as imprecision and not inaccuracy. In a study of the natural head position in standing subjects, Solow and Tallgren [28] found a reproducibility of 1.4° for head flexion/extension, and similar values have been reported in another study [35]. Hence, the contribution of the method per se to the overall exposure variability can, for head flexion/extension, be estimated by the (square root of) the sum of variances caused by …”

Section: Accuracy and Precision Of The Methodssupporting

confidence: 63%

Precision of measurements of physical workload during standardised manual handling. Part II: Inclinometry of head, upper back, neck and upper arms

Hansson

Arvidsson

Ohlsson

et al. 2006

Journal of Electromyography and Kinesiology

113

103

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“…Patients sat wearing a hair band, with centric occlusion, reposed lips, and natural head position. 13 OptoTOP-SE (Breuckmann, Meersburg, Germany; white-light scanner; 30-40 mm accuracy according to the manufacturer, scanning time ,3 seconds) was used by a single operator. The 3D-FSIs were reconstructed using Rapidform 2006 and Rapidform XO scanning software (Inus Technology Inc, Seoul, Korea).…”

Section: Methodsmentioning

confidence: 99%

“…13 Cephalometric tracing and measurements were performed by a single operator using the V-Ceph program (Osstem, Seoul, Korea).…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Lim¹,

Chu²,

Lee³

et al. 2010

The Angle Orthodontist

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Objective: To evaluate whether mandibular setback surgery (MSS) for Class III patients would produce gradients of three-dimensional (3D) soft tissue changes in the vertical and transverse aspects. Materials and Methods: The samples consisted of 26 Class III patients treated with MSS using bilateral sagittal split ramus osteotomy. Lateral cephalograms and 3D facial scan images were taken before and 6 months after MSS, and changes in landmarks and variables were measured using a Rapidform 2006. Paired and independent t-tests were performed for statistical analysis. Results: Landmarks in the upper lip and mouth corner (cheilion, Ch) moved backward and downward (respectively, cupid bow point, 1.0 mm and 0.3 mm, P , .001 and P , .01; alar curvature-Ch midpoint, 0.6 mm and 0.3 mm, both P , .001; Ch, 3.4 mm and 0.8 mm, both P , .001). However, landmarks in stomion (Stm), lower lip, and chin moved backward (Stm, 1.6 mm; labrale inferius [Li], 6.9 mm; LLBP, 6.9 mm; B9, 6.7 mm; Pog9, 6.7 mm; Me9, 6.6 mm; P , .001, respectively). Width and height of upper and lower lip were not altered significantly except for a decrease of lower vermilion height (Stm-Li, 1.7 mm, P , .001). Chin height (B9-Me9) was decreased because of backward and upward movement of Me9 (3.1 mm, P , .001). Although upper lip projection angle and Stm-transverse projection angle became acute (Ch Rt -Ls-Ch Lt , 5.7u; Ch Rt -Stm-Ch Lt , 6.4u, both P , .001) because of the greater backward movement of Ch than Stm, lower lip projection angle and Stm-vertical projection angle became obtuse (Ch Rt -Li-Ch Lt , 10.8u; LsStm-Li, 23.5u, both P , .001) because of the larger backward movement of Li than labrale superius (Ls). Conclusions: Three-dimensional soft tissue changes in Class III patients after MSS exhibited increased gradients from upper lip and lower lip to chin as well as from Stm to Ch. (Angle Orthod. 2010;80:896-903.)

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Natural Head Position in Standing Subjects

Cited by 387 publications

References 4 publications

The demands of professional opera singing on cranio-cervical posture

The demands of professional opera singing on cranio-cervical posture

Precision of measurements of physical workload during standardised manual handling. Part II: Inclinometry of head, upper back, neck and upper arms

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

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