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INTRODUCTION: Preterm children display only slightly lower exercise capacity than term children do during their development, despite their previous cardiopulmonary impairments. This raises doubts about the role of the respiratory muscles' influence on exercise capacity. This study aimed to compare respiratory muscle activity in preterm and term children using an exercise test. METHODS: This cross-sectional study involved comparison of 35 term children and 39 matched preterm children aged 6-9 years, who were born prematurely with a birth weight <1500 g. An adapted treadmill incremental test was utilized and surface electromyography of the sternocleidomastoid (SCM), upper trapezius (UT), and rectus abdominis (RA) muscles was performed. The root mean square was calculated every minute and compared between and within groups. A Monte Carlo simulation was also applied, and the area under the curve was calculated to evaluate the differences between groups. RESULTS: During the entire exercise, the SCM muscle activity was higher in preterm children with a larger area under the curve than in the term children. There was no difference in the RA and UT muscle activity between groups throughout the test. CONCLUSION: The results suggest a greater contribution of the SCM muscle sin preterm children's performance than in term children's performance during high-intensity exercises. TRIAL REGISTRATION: Brazilian Clinical Trial Registry (ReBec) - RBR-89hr2h.

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Objetivo: Avaliar a prevalência de atraso e fatores associados aos escores de desenvolvimento em crianças nascidas prematuras. Métodos: Estudo transversal para avaliar o desenvolvimento por escalas Bayley III, incluindo-se prematuros de muito baixo peso de 18 a 24 meses de idade corrigida, acompanhados no Ambulatório de Prematuros da instituição. Excluíram-se: malformação congênita, síndrome genética, infecção congênita sintomática ao nascimento, surdez e cegueira. As variáveis numéricas foram comparadas por teste t de Student ou Mann-Whitney, e as categóricas, por qui-quadrado ou teste exato de Fisher. Para análise dos fatores associados aos escores de desenvolvimento, utilizou-se a regressão linear, considerando-se significante p < 0,05. Resultados: Das 58 crianças avaliadas, quatro (6,9%) apresentaram alteração cognitiva; quatro (6,9%), motora; 17 (29,3%), de linguagem; 16 (27,6%), socioemocional; e 22 (37,9%), de comportamento adaptativo. A regressão linear múltipla, os fatores classe socioeconômica CDE (-13,27; IC95% -21,23 a -5,31) e dependência de oxigênio com 36 semanas de idade corrigida (-8,75; IC95% -17,10 a -0,39) diminuíram o escore cognitivo. A leucomalácia periventricular diminuiu o escore cognitivo (-15,21; IC95% -27,61 a -2,81), motor (-10,67; IC95% -19,74 a -1,59) e de comportamento adaptativo (-21,52; IC95% -35,60 a -7,44). O sexo feminino se associou ao maior escore motor (10,67; IC95% 2,77-12,97), de linguagem (15,74; IC95% 7,39-24,09) e socioemocional (10,27; IC95% 1,08-19,46). Conclusões: Prematuros de muito baixo peso apresentaram com maior frequência alterações na linguagem, comportamento adaptativo e socioemocional. As variáveis classe socioeconômica CDE, leucomalácia periventricular, displasia broncopulmonar e sexo masculino contribuíram para reduzir os escores de desenvolvimento.

Objective: To evaluate the prevalence of delay and factors associated with neurodevelopmental scores in premature infants. Methods: Cross-sectional study to assess the development by Bayley Scales III, including very low birth weight preterm infants aged 18 to 24 months who were under follow-up at the outpatient clinic for preterm infants. Congenital malformation, genetic syndrome, symptomatic congenital infection at birth, deafness, and blindness were excluded. Numerical variables were compared by Mann-Whitney or Student t test and categorical variables by chi-square or Fisher's exact test. Factors associated with developmental scores were analyzed by linear regression, and statistical significance level was established at p < 0.05. Results: Out of the 58 children included, four (6.9%) presented cognitive delay, four (6.9%) motor, 17 (29.3%) language, 16 (27.6%) social-emotional and 22 (37.0%) adaptive-behavior delay. By multiple linear regression, the variables: social classes CDE (-13.27; 95%CI: -21.23 to -5.31), oxygen dependency at 36 weeks of corrected age (-8.75; 95%CI: -17.10 to -0.39) decreased the cognitive developmental score. Periventricular leukomalacia decreased the cognitive (-15.21; 95%CI: -27.61 to -2.81), motor (-10.67; 95%CI:-19.74 to -1.59) and adaptive behavior scores (-21.52; 95%CI: -35.60 to -7.44). The female sex was associated with higher motor (10.67; 95%CI: 2.77 to 12.97), language (15.74; 95%CI: 7.39 to 24.09) and social-emotional developmental scores (10.27; 95%CI: 1.08 to 19.46). Conclusions: Very low birth weight preterm infants aged from 18 to 24 months of corrected age presented more frequently language, social-emotional and adaptive-behavior delays. The variables: social classes CDE, periventricular leukomalacia, bronchopulmonary dysplasia and male sex reduced the neurodevelopmental scores.