On the contrary, activity of the GM was increased. In the study by Cynn and Oh (2006), activity of the QL was lowered in the side-lying hip abduction while maintaining lumbar stability using biofeedback pressure. Selective activation of the GM using side-lying hip abduction exercise is still controversial among researchers ( Lee and Cynn, 2014 Macadam et al., 2015 Joseph and Kennifer, 2012 Kim et al., 2016). Selective activation of the GM and lowering compensation of hip surrounding muscles is very useful when planning a clinical exercise program for lower limb dysfunction ( Selkowitz et al., 2013). Resistance exercises using elastic bands in various postures such as a standing posture, side-lying bridge posture, and side-lying posture can be used as a way to increase activity of the GM ( Macadam et al., 2015). However, Selkowitz and Beneck (2013) suggested that Side-lying abduction was non-adequate because activity of the TFL was higher during clam exercise. In addition, Macadam (2015) and Selkowitz and Beneck (2013) reported that GM activity was higher during side-lying hip abduction exercise than clam exercise. Side-lying hip abduction is commonly used as a GM exercise ( Distefano and Blackburn, 2009 Gwon and Kim, 2016) or GM strength test of hip abductor in clinic ( Kendall et al., 2005). Therefore, strengthening of the gluteus muscles can affect prevention diseases that may occur in the lumbar region and the knee.
This causes hip elevation and in turn, mobilization and not stabilization of the QL ( Page et al., 2010).Įxcessive activation of the QL causes the pelvis to move outward, resulting in lateral bending and instability of the lumbar region ( Cynn et al., 2006). Early contraction of the QL occurs when the angle of side-lying abduction is less than 20 degrees. This moves the patella to the lateral side and causes patellofemoral pain syndrome ( Merican and Amis, 2008). Excessive compensatory activity of the TFL pulls the retinaculum of the knee.
Especially, low activity and weakening of the gluteus medius (GM) can causes compensation by the synergist tensor fascia latae (TFL) and quadratus lumborum (QL) ( Lee et al., 2013 Clark and Lucett, 2011). Keywords : Gluteus medius, Quadratus lumborum, Surface EMG, Tensor fascia lataeĪbnormal interactions of hip muscle can cause hip dysfunction and lead to musculoskeletal disorders of the hip and knee ( Ferber et al., 2010 Hewett et al., 2005 Willson and Davis, 2008 Leinonen et al., 2000). In addition, Hip abduction with pelvic neutral position may have an effect on the selective gluteus medius, which is considered to be effective in the exercise program for muscle reeducation training of the gluteus medius. Hip abduction with Pelvic posterior tilt position may be effective in increasing gluteus medius and may be effective in strengthening exercise program for the gluteus medius. The activity of selective gluteus medius activation according to pelvic displacement showed the highest activity in pelvic neutral tilt position and lowest in pelvic anterior tilt position (p =. The activity of quadratus lumborum revealed the lowest activity in pelvic neutral tilt position and the highest in pelvic anterior tilt position (p =. The activity of tensor fascia latae showed the lowest in pelvic posterior tilt position and the highest in pelvic posterior tilt position (p =.
The activity of gluteus medius within three pelvic positions showed the highest activity in pelvic posterior tilt position and the lowest in pelvic neutral tilt position (p =. We used the mean value after participants performed the hip abduction three times each position. Three pelvic tilt positions were posterior tilt, neutral tilt and anterior tilt. We measured the activity of three muscles in three pelvic tilt positions for 17 normal subjects with performing the side-lying hip abduction. This study was to evaluate the muscle activity of gluteus medius, tensor fascia latae, and quadratus lumborum during side-lying abduction exercise in various pelvic tilting positions.
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