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Gluteus Maximus has a number of actions, an antigravity action is literally an action against the down ward pull of gravity. If the thigh is flexed the Gluteus Maximus is able to to bring it into aline with the trunk now when standing this is not an antigravity action as it may be considered gravity assisted however if lying face down this is antigravity or if in the air as in a high jump action or flip this action is against gravity.. The muscle may be activated to lift the trunk up from a forward bend position which is a reversed anti gravity action meaning that the muscle has now changed it's fixed point of action.It does this by rotating the pelvis backwards on the head of femur against gravity. It is intermittantly active when climbing stairs helping the hip to extend against gravity and lift the body up on the stair.
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How do the extent and orientation of the human gluteus muscle differ from their relative position in the cat?
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