In a spontaneous sitting, kyphotic position of sacral slope and lumbar lordosis was observed which assumed a slightly lordotic position when instructed with the command.
enumerates four types of sitting postures: (1) slump (thoracolumbar and lumbar spine in a kyphotic position), (2) flat (thoracolumbar and lumbar spine in a vertical position), (3) long lordosis (thoracolumbar and lumbar spine in a lordotic position), and (4) short lordosis (thoracic kyphosis and lumbar lordosis).
In a sitting position, the adoption of lordotic position of sacral slope and lumbar lordosis was observed.
Ex vivo laboratory experiments of the cervical spine have presented evidence to suggest that the cervical spine is able to bear the greatest axial forces when in the natural lordotic position
. (26,27) Loss of lordosis has been shown to increase the risk of cervical spine injuries.