Abstract
BackgroundThe abdominal drawing-in maneuver (ADIM) is used to prevent abnormal movements of the lumbar spine and pelvis during therapeutic exercises. This study compared the effects of ADIM on the muscle onset time of the hamstring, gluteus maximus, and erector spinae muscles during prone hip extension exercise in subjects with or without hyperlordotic lumbar angle. Forty healthy adults (18 male, 22 female) were recruited for this study.MethodsThe lumbar lordotic angles and pelvic tilt angles of the subjects were measured using the Avaliação postural analysis software. The subjects were divided into two groups: the lumbar hyperlordotic angle (LHLA) and lumbar normal lordotic angle (LNLA) groups. The muscle contraction onset time of the hamstring, gluteus maximus, and erector spinae were assessed using surface electromyography.ResultsDuring ADIM application, the muscle contraction onset time of the gluteus maximus was significantly increased in the LHLA group compared with the LNLA group.ConclusionsADIM application during prone hip extension was more effective for gluteus maximus onset time in the LHLA group. Therefore, ADIM during prone hip extension may be useful for gluteus maximus training in individuals with lumbar hyperlordosis.
Highlights
The abdominal drawing-in maneuver (ADIM) is used to prevent abnormal movements of the lumbar spine and pelvis during therapeutic exercises
An intra-group comparison of the HAM muscle onset time in the lumbar hyperlordotic angle (LHLA) group showed that the muscle onset time was 2.24 ± 0.24 ms without ADIM application and 2.18 ± 0.19 ms with ADIM application, but this change was not significant (P >0.05; Figure 3)
This study aimed to investigate the changes in the muscle onset time of the HAM, gluteus maximus (GM), and lumbar elector spinae (LES) after ADIM application during hip extension in 40 subjects (20 in the LHLA group and 20 in lumbar normal lordotic angle (LNLA) group), and to verify the effects of ADIM on lordosis to determine its clinical usefulness
Summary
The abdominal drawing-in maneuver (ADIM) is used to prevent abnormal movements of the lumbar spine and pelvis during therapeutic exercises. This study compared the effects of ADIM on the muscle onset time of the hamstring, gluteus maximus, and erector spinae muscles during prone hip extension exercise in subjects with or without hyperlordotic lumbar angle. The onset times of muscle contraction can be altered by an abnormal lumbar lordotic angle and excessive pelvic anterior tilting, which in turn delays the response time of the abdominal muscles and GM in daily activity [10]. Nygren Pierce and Lee [11] reported that a delay in GM muscle activity was caused by pelvic instability and changes in surrounding muscle lengths during hip extension In this way, the altered onset times of trunk and hip extension could decrease the stability of the lumbar spine and pelvis during walking, degrade the mechanical efficiency of the pelvic and lumbar motion, and cause low back pain [12]
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