Comparison of muscle tone development in various preterm infants at birth and term corrected gestational age versus term infants – a single-center cohort study

Priyanga Seemathan, Rajeswari Muthusamy, Siva Kumar. R, Rabindran Chandran

Priyanga Seemathan, Rajeswari Muthusamy, Siva Kumar. R, Rabindran Chandran – Comparison of muscle tone development in various preterm infants at birth and term corrected gestational age versus term infants – a single-center cohort study –  Fizjoterapia Polska 2025; 25(1); 327-334

DOI: https://doi.org/10.56984/8ZG007DYDBW

Abstract
Background. Muscle tone in preterm infants (PTI) is often reduced due to maturation-related hypotonia. As intrauterine and extrauterine environments vary, the maturation of muscle tone at 40 weeks of corrected gestational age (CGA) may also differ. This study aims to compare muscle tone development in extreme PTI, very PTI, and moderate to late PTI at birth and to compare PTI of various gestational ages with full-term infants (FTI) at 40 weeks of CGA.
Methods. This observational study was conducted with 132 infants based on specific criteria after obtaining informed consent. Muscle tone in PTI of various gestational ages was measured using the Amiel-Tison angle (ATA) at birth. They were reassessed for muscle tone at 40 weeks of corrected gestational age. Muscle tone in FTI was also assessed using ATA at birth.
Results. ANOVA and post hoc analysis of the three groups showed a significant difference in muscle tone among extreme PTI, very PTI, and moderate PTI at birth for all angles (p < 0.05). ANOVA of the three PTI groups and FTI showed a significant difference between the groups (p < 0.05), except for the dorsiflexion angle between moderate PTI and FTI at 40 weeks of corrected age.
Conclusions. The significant differences in muscle tone among PTI of various gestational ages at birth and between PTI and FTI at 40 weeks of CGA emphasize the need for addressing tonal deviations appropriately based on gestational age to enhance motor development.
Key words
Amiel-Tison angle, maturation-related hypotonia, muscle tone, preterm infants
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Assessment of general movements and its relation to gestational age in preterm infants

Aneta Skworc


Aneta Skworc – Assessment of general movements and its relation to gestational age in preterm infants. Fizjoterapia Polska 2022; 22(2); 88-95

Abstract
Introduction. The task of contemporary neonatology is not only to save the lives of children born prematurely, but also to provide them with the highest possible quality of life. One of the methods of assessing the quality of general movement patterns is the Prechtl method, which enables early identification of immaturity or damage to the central nervous system. Aim. Dynamic assessment of the type and quality of GMs (General Movements) in preterm infants to determine the indications for early neurodevelopmental support and to determine the relationship between the occurrence of maternal and neonatal perinatal risk factors, and the type and quality of general movements. Material and method. Assessment was conducted in 90 infantsborn between 28 and 36 weeks gestational age. Dominant cases (57 cases) were infants brn between32 and 36 weeks GE. Most cases (48) received low Apgar score at 1 minute (≤ 7), including two born in very severe condition. The study included three GM assessments: I –up to 14 day post-natally, II at term and III between12 and 15 weeks corrected age. The analysis included gestational age, general condition of the newborn in Apgar score. Results. There is a close correlation with the gestational age of a preterm newborn, and the occurrence of damage to the nerve centers and the finding of abnormal global movements.It was confirmed that gestational age is important variables affecting the occurrence of abnormal general movements.
Key words:
general movements, preterm infants, perinatal risk factors, neurodevelopmental physiotherapy
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