Final answer:
Dynamic sitting balance is related to one's ability to sit unsupported and maintain stability through the alignment of the center of gravity and pivot points in the body. Stability can be increased by lowering the center of gravity and widening the base of support. Issues with dynamic sitting balance can manifest as an inability to sit unsupported or the need for significant compensatory movements.
Step-by-step explanation:
The dynamic sitting balance of an individual can be understood by looking at their ability to maintain stability while sitting. The center of gravity (cg) of an adult is above the hips, acting as the pivot. Good posture involves aligning the cg directly above the pivot point to avoid strain.
When a person is able to sit unsupported with minimal weight shift ipsilaterally to the front, it indicates a certain level of balance. However, if one is unable to sit unsupported, it suggests a lack of sitting balance. In contrast, being able to sit unsupported with significant weight shift implies compromised but present balance, requiring compensatory movements to maintain stability.
Humans tend to be less stable with forward and backward displacements due to the shorter length of the feet. Therefore, extensive muscle control is necessary to maintain balance. Stability can be enhanced by lowering the cg or by widening the base of support, as seen in actions such as bending the knees, or using assistive devices like a cane or walker.