Assessment of muscle fatigue in school-age children under different sitting postures

LUO Ling; HU Huimin; NIU Wenlei; HAO Anna

doi:10.16835/j.cnki.1000-9817.2025115

Volume 46 Issue 4

Apr. 2025

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LUO Ling, HU Huimin, NIU Wenlei, HAO Anna. Assessment of muscle fatigue in school-age children under different sitting postures[J]. CHINESE JOURNAL OF SCHOOL HEALTH, 2025, 46(4): 558-562. doi: 10.16835/j.cnki.1000-9817.2025115

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LUO Ling, HU Huimin, NIU Wenlei, HAO Anna. Assessment of muscle fatigue in school-age children under different sitting postures[J]. CHINESE JOURNAL OF SCHOOL HEALTH, 2025, 46(4): 558-562. doi: 10.16835/j.cnki.1000-9817.2025115

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Assessment of muscle fatigue in school-age children under different sitting postures

doi: 10.16835/j.cnki.1000-9817.2025115

LUO Ling^{1, 2},
HU Huimin^{1, 2
,
,},
NIU Wenlei^{1, 2},
HAO Anna³

1.
Human Efficiency Laboratory, China National Institute of Standardization, Beijing (100191), China

Received Date: 2024-11-04
Rev Recd Date: 2025-02-17

Available Online: 2025-05-08

Publish Date: 2025-04-25

Abstract

Abstract

Objective To investigate the effects of poor sitting postures on muscle fatigue in school-age children, so as to provide evidence for developing healthy sitting guidelines. Methods In May 2024, 30 children aged 6-12 were recruited from Changping District in Beijing. A combination of surface electromyography (sEMG) and psychophysical scales were used to assess muscle fatigue at varying deviation angles under four sitting postures (forward head tilt, lateral head tilt, uneven shoulder height, and forward trunk inclination). One-way ANOVA and LSD post hoc multiple comparisons were employed to analyze the differences in electromyographic (EMG) data among various deviation angles under different sitting postures. Results The mean integrated electromyography (I_EMG) of representative muscles showed statistically significant differences (P < 0.05) across deviation angles in all postures, with muscle fatigue worsening as deviation angles increased. Forward head tilt: significant I_EMG differences were observed in the left/right sternocleidomastoid and left/right splenius capitis (F=13.74, 13.21, 5.43, 6.11, P < 0.05). Lateral head tilt: significant differences were found in the right sternocleidomastoid muscle (SCM), right splenius capitis, and left trapezius (F=5.13, 4.73, 12.13, P < 0.05). Uneven shoulder height: significant differences occurred in the right SCM, bilateral splenius capitis, and left trapezius (F=12.46, 12.56, 32.49, 5.98, P < 0.05).Forward trunk inclination, significant differences were identified in the left/right SCM, left/right splenius capitis, and left/right lumbar muscles (F=4.45, 9.84, 14.49, 26.44, 8.02, 18.34, P < 0.01). Temporal analysis revealed varying fatigue onset times across postures: severe fatigue occurred earlier in lateral head tilt and forward trunk inclination, while excessive forward head tilt, lateral head tilt, and uneven shoulder postures predominantly induced mild to moderate fatigue. Conclusions Under different sitting postures, both the integrated I_EMG of relevant muscles and subjective evaluations in school-aged children increase with greater postural deviattion. Head tilt and trunk-leaning postures require particular intervention, with emphasis on uneven-shoulder alignment and trunk inclination control.
- Sitting position,
- Muscle fatigue,
- Analysis of variance,
- Child

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References(20)

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