Which of the following muscle contractions results in a decrease in lumbar curvature during a client's squat assessment?
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AContraction of the gluteus maximus, hamstrings, and rectus abdominus
BContraction of the hip flexors and lumbar extensors
CContraction of the spinal rotators and hip abductors
✓ Correct answer: A. Contraction of the gluteus maximus, hamstrings, and rectus abdominusAnswer: Contraction of the gluteus maximus, hamstrings, and rectus abdominus These muscles work together to create a posterior pelvic tilt, reducing lumbar lordosis by pulling the pelvis down at the back and up at the front. In contrast, contraction of the hip flexors and lumbar extensors would result in an anterior pelvic tilt, increasing lumbar curvature. The contraction of the spinal rotators and hip abductors affects lateral stability and rotation, not directly altering lumbar curvature.
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