Effect of standing postural deviations on trunk and hip muscle activity

Area of Science:

• Biomechanics
• Kinesiology
• Musculoskeletal health

Background:

• Low back pain is a prevalent condition often linked to altered muscle function.
• Postural deviations can significantly impact the biomechanics of the lumbo-pelvic region.
• Understanding muscle activity during different postures is essential for targeted interventions.

Purpose of the Study:

• To compare trunk and hip joint muscle activity in healthy adults across three distinct postural conditions: neutral, sway-back, and lordosis.
• To evaluate the effects of postural deviations on muscle activation patterns.
• To provide insights into the relationship between posture and muscle control in the lumbo-pelvic area.

Main Methods:

• Seventeen healthy adult males participated in the study.
• Muscle activity and spinal curves were measured.
• Subjects were instructed to adopt neutral, sway-back, and lordosis postures.

Main Results:

• Sway-back posture led to decreased activity in trunk and hip inner muscles.
• Lordosis posture resulted in increased activity solely in the trunk back muscles.
• Distinct changes in muscle activation were observed across the different postural conditions.

Conclusions:

• Postural deviations demonstrably affect muscle control mechanisms in the lumbo-pelvic region.
• These findings highlight the importance of assessing and correcting postural deviations in managing low back pain.
• Altered muscle activity patterns associated with specific postures warrant further investigation for therapeutic applications.