Influence of Changing Hip Position on Electromyographic Activities of Selected Trunk Muscles During Bridging Exercises in Healthy Subjects: A Cross-Sectional Study

• Published in: Journal of manipulative and physiological therapeutics Vol. 47; no. 1-4; pp. 12 - 21
• Main Authors: El Melhat, Ahmed M., El Khatib, Ayman, Youssef, Ahmed S.A., Zebdawi, Moustafa R., Abdelhamid, Samar M., Hamada, Hamada Ahmed, Abbas, Rami L.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.01.2024
• Subjects: Abdominal Muscles - physiology; Adult; Bridging Exercise; Cross-Sectional Studies; Electromyography; EMG; Exercise - physiology; Exercise Therapy; Female; Healthy Volunteers; Hip - physiology; Hip position; Humans; Male; Muscle, Skeletal - physiology; Physical Medicine and Rehabilitation; Posture - physiology; Torso - physiology; Trunk Muscles; Young Adult; Bridging Exercise; EMG; Exercise Therapy; Trunk Muscles; Hip position
• ISSN: 0161-4754; 1532-6586; 1532-6586
• DOI: 10.1016/j.jmpt.2024.08.010

The purpose of this study was to investigate how rectus abdominis, external oblique (EO), internal oblique (IO), erector spinae, multifidus (MF), and gluteus maximus (GMax) muscle activities change with different hip positions during back and side bridging exercises. Thirty-six healthy individuals participated in this cross-sectional study and performed 6 exercises including back bridging (BB) in neutral hip position, BB with internal rotation, BB with external rotation (BB + ER), side bridging with hips in neutral (SB), side bridging with hips in flexion (SB + HF), and side bridging with hips in extension (SB + HE). Muscle activity was observed using surface electromyography, normalized using maximum voluntary isometric contraction. Repeated-measures 1-way analysis of variance compared muscle readings for each position. Back bridging with internal rotation showed significant differences in EO (P = .01) and IO (P < .001) compared with other BB positions. Multifidus and GMax differed significantly in BB + ER (P = .04). Side bridging exhibited significant differences in EO (P = .02; P < .001) and IO (P < .001) compared with the other 2 SB positions, with peak in SB + HF. Erector spinae, MF, and GMax also differed significantly (P < .001, P = .02, P < .001, respectively) with peak in SB + HE. The findings revealed that EO and IO muscles were most active during BB with internal rotation, whereas the MF and GMax muscles were most active during BB + ER. In terms of SB, the EO and IO muscles were most active with either SB + HF or SB + HE, whereas the erector spinae, MF, and GMax muscles were most active with SB + HE.