Person support apparatuses with selectively coupled foot sections

1. A person support apparatus comprising:

a base frame;

a primary support frame supported on the base frame;

a foot section coupled to the primary support frame;

a carriage that is freely translatable between a head end of the primary support frame and a foot end of the primary support frame, the carriage comprising a torso portion and a seat portion comprising a thigh segment and a gluteal segment;

a selectable trunnion that selectively and severally couples the foot section to the primary support frame and the thigh segment of the seat portion; and

a support surface supported on the carriage such that the support surface translates with the carriage, the support surface comprising at least one support section which is collapsible in a length direction of the support surface, wherein the at least one support section collapses as the carriage translates towards the foot end of the primary support frame;

wherein the at least one support section comprises an air bladder and a control valve fluidly coupled to the air bladder, the control valve comprising a normally closed position and a vent position; and

wherein the person support apparatus comprises an exercise configuration wherein the control valve is in the vent position and the air bladder is vented to atmosphere such that air is expelled from the air bladder when the carriage translates toward the foot end of the primary support frame regulating a rate of travel of the carriage with respect to the primary support frame.

2. The person support apparatus of claim 1 , wherein the at least one support section is a lower support section of the support surface.

3. The person support apparatus of claim 2 , wherein the support surface further comprises an upper support section comprising an air bladder, wherein the air bladder of the upper support section is not vented when the person support apparatus is in an exercise configuration.

4. The person support apparatus of claim 1 , wherein the gluteal segment and the thigh segment are pivotally coupled to one another.

5. The person support apparatus of claim 4 , wherein the person support apparatus comprises an exercise configuration wherein:

the torso portion is inclined with respect to the seat portion; and

the thigh segment is pivoted towards the gluteal segment.

6. The person support apparatus of claim 1 , wherein the primary support frame further comprises a track frame comprising upper support rails and wherein the carriage further comprises carriage rails that are slidably coupled to the upper support rails.

7. The person support apparatus of claim 6 , wherein the torso portion is pivotally coupled to the carriage rails and wherein the torso portion is inclined with respect to the seat portion in an exercise configuration.