RecruitingACTRN12610000825055

Influence of intrinsic and extrinsic constraints on head movements during eye-head coordination in fullterm and preterm infants among 1 to 4 months

Influence of age and prematurity (instrinsic constraints) and body orientations (supine, semiflexion and reclined postures - extrinsic constraints) on head movements during eye-head coordination in fullterm from 1 to 4 months of age and preterm healthy infants among 1 to 4 months of corrected age measured by kinematical analysis.

Sponsor

Carolina Daniel de Lima-Alvarez

Enrollment

40 participants

Start Date

Sep 1, 2010

Study Type

Interventional

Conditions

head movements in pre-term infants head movements in fullterm infants

Summary

The current study aim to investigate the influence of different body orientations (extrinsic constraint) on continuous (mean velocity; head range of motion: flexion-extention, inclination and rotation) and categorical (head movement frequency; head trajectory – side-to-midline, midline-to-side and side-to-side; initial head position – right, left and midline) variables of head movements in the period when head control is developing (0-4 months of age considered an intrinsic constraint) in both: fullterm and pre-term infants.

Eligibility

Sex: Both males and femalesMin Age: 0 MonthssMax Age: 6 Monthss

Plain Language Summary

Simplified for easier understanding

This study is observing how healthy newborn and premature babies aged 0 to 6 months move and control their heads in different body positions. Researchers want to understand how the ability to move the head develops in the first few months of life, and how being born early (premature) may affect this development. You may be eligible if: - Your baby is a healthy full-term infant (born at 37–40 weeks) with a birth weight over 2,500 g and good Apgar scores - OR your baby is a healthy premature infant (born at 30–36 weeks) with a birth weight appropriate for their age and good Apgar scores - Your baby has no known neurological or musculoskeletal conditions You may NOT be eligible if: - Your baby has a central nervous system defect (such as hydrocephalus or spina bifida) - Your baby has signs of neurological damage or brain injury - Your baby has a musculoskeletal condition (such as congenital torticollis) - Your baby has a genetic syndrome (such as Down syndrome) - Your baby has a congenital infection, sensory deficit, or heart/lung problems Talk to your doctor about whether this trial might be right for you.

This summary was AI-generated to explain the trial in plain language. It is not medical advice. Always discuss eligibility with your doctor before enrolling in a clinical trial.

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Interventions

All infants (fullterm and pre-term) will be evaluated in three conditions (supine, semiflexion and reclined) in every assessment (1, 2, 3 and 4 months). The infant will be exposed in three condition

All infants (fullterm and pre-term) will be evaluated in three conditions (supine, semiflexion and reclined) in every assessment (1, 2, 3 and 4 months). The infant will be exposed in three conditions: 1) Condition supine, the chair will be positioned parallel to horizontal plane. 2) Condition semiflexion, the chair will be positioned parallel to horizontal plane and an infant pillow (25X20 cm), having a small concavity in the center, maintained the infant’s neck semiflexed to about 15 degrees. The concavity on the pillow did not restricte head movement. 3) Condition reclined, the chair will be positioned 20 degrees from the horizontal and infant’s neck remained semiflexed. The sequence order of conditions exposure will be arranged in three predetermined groups: 1) supine-semiflexion-reclined; 2) reclined-semiflexion-supine; and 3) semiflexion-reclined-supine. In all conditions, the infant will be presented with a black and white happy face card (10X10 cm), which will be placed in front of his/her face at eyes’ height and at a distance of 25-40 cm. The card will be moved slowly (manually, always by the same examiner) in a crosswise direction as soon as the infant had gazed it. When visual contact with the card were lost, it will be presented again, as many times as necessary, within the 2-min period determined for each condition. Visual contact during head movement will be monitored through the reflection of the card image in the infant’s pupil.

Locations(1)

Sao Carlos, Brazil

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ACTRN12610000825055