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The effect of behavioural state on general movements in healthy full-term newborns. A polymyographic study
M Hadders-Algra1, Y Nakae, L A Van Eykern
1Department of Developmental Neurology, University Hospital Groningen, Netherlands.
Insights
Newborn general movements (GMs) vary significantly with behavioral state. Non-nutritive sucking during active sleep alters GM characteristics, impacting muscle activity and movement amplitude.
Area of Science:
- Neonatal physiology
- Developmental neuroscience
- Motor control
Background:
- General movements (GMs) are key indicators of neurological development in infants.
- Understanding how behavioral states influence GM organization is crucial for early detection of developmental abnormalities.
Purpose of the Study:
- To investigate the impact of different behavioral states on the organization and characteristics of general movements in healthy newborns.
- To evaluate the effect of non-nutritive sucking on general movements during active sleep (State 4).
Main Methods:
- Six-hour polygraphic recordings were performed on eight healthy, full-term newborns.
- Recordings included EMG of eight arm muscles and simultaneous video analysis of GMs.
- Non-nutritive sucking was introduced during State 4 to assess its effects.
Main Results:
- Behavioral state significantly altered GM composition, with State 4 exhibiting the most fluent and typical GMs.
- State 2 GMs were fragmented and showed longer burst durations and lower tonic activity compared to State 4.
- State 5 GMs were abrupt, vigorous, and often had superimposed tremors, with shorter intervals and higher EMG amplitudes than State 4.
- Non-nutritive sucking during State 4 reduced movement amplitude and increased EMG burst duration and tonic activity in specific arm muscles.
Conclusions:
- Behavioral state is a critical determinant of general movement organization in newborns.
- Non-nutritive sucking during active sleep modifies motor output and movement characteristics.
- These findings provide a baseline for understanding typical GM development and potential disruptions.
Abstract:
In a group a eight healthy full-term newborns 6-h polygraphic recordings, which included EMG recording of eight arm muscles, were made to investigate the effect of behavioural state on general movement (GM) organization. Simultaneous video recordings supplied information about the form of the GMs. Additionally the effect of non-nutritive sucking during State 4 was evaluated. Behavioural state had a distinct effect on the makeup of GMs. GMs during State 4 displayed best the fluency and elegance which are characteristic of normal GMs. State-1-GMs were rare, had a short duration and sometimes had an abrupt onset. During State 2 GMs had a fragmented appearance. EMG differences between GMs in State 2 and State 4 were demonstrated in burst duration (longer during State 2) and tonic background activity in the upper arm muscles (lower during State 2). Occasionally State-2-GMs had an abrupt onset. These abrupt GMs were less often preceded by rapid eye movements and heart rate changes than State-2-GMs with a gradual onset. GMs during State 5 were abrupt and vigorous and often had a high frequency tremor superimposed. The EMGs of State-5-GMs revealed a shorter interval between the EMG bursts and a higher EMG burst amplitude in the upper arm muscles than present during State-4-GMs. Non-nutritive sucking during State 4 induced a reduction of movement amplitude, a increase of EMG burst duration and an increase of tonic background activity in the biceps brachii and the extensor carpi muscles.