What occurs when the latissimus dorsi becomes overactive in relation to the deep longitudinal subsystem?

The correct choice highlights how overactivation of the latissimus dorsi can influence the pelvis and lumbar spine alignment. When the latissimus dorsi becomes overactive, it can contribute to excessive lumbar extension. This occurs because the latissimus dorsi attaches to the pelvis and the lower spine, and its overactivity can lead to an anterior pull on the pelvis, resulting in an anterior pelvic tilt. This tilt increases the curvature of the lumbar spine, leading to excessive extension in that region.

In the context of the deep longitudinal subsystem, which is primarily responsible for stabilizing the spine, pelvis, and legs during dynamic activities, the overactivity of the latissimus dorsi disrupts its normal function. Instead of providing adequate stability through proper alignment, the excess extension can lead to compensatory patterns and increase the risk of injury or dysfunction.

The other options do not accurately reflect the consequences of overactivity in the latissimus dorsi within the framework of the deep longitudinal subsystem. For instance, while the latissimus dorsi may influence movement patterns, it does not typically cause excessive lateral flexion, restrict hip flexion directly, or increase stability in the thoracic spine in the context described. Instead, it primarily impacts the lumbar region through