Table 1.

The joint loads and flexion angle on various sitting posture (mean value)

	Moment [Nm/(kg*m)]		AP reaction force [N/kg]		Head flexion angle [deg]
	On chest	Forward	On chest	Forward	On chest	Forward
Cervico-thoracic joint
Slump	0.07	0.06	0.56	0.49	42.44	36.98
Flat	0.02	0.03	$-$0.05	0.13	$-$0.03	12.42
Lordosis	0.01	0.03	$-$0.06	0.12	$-$0.46	13.02
Lumbosacral joint
Slump	0.28	0.30	1.45	1.39	7.38	7.96
Flat	0.09	0.12	0.32	0.25	$-$8.72	$-$8.63
Lordosis	0.09	0.12	0.37	0.27	$-$8.07	$-$8.48