http://www.uncc.edu/jdtabor/crucifixion.html
Given the topicality of the Passion of The Christ, it got me thinking again about the manner of his death..I had always been led to believe , in my days as a dub , that death on a stake was far more likely and logical because to be suspended with spread arms would place too much centre of gravity in the centre and the body would pitch forward.. Given that Jesus took several hours to die, I found the following quote from .the above site interesting .
"PHYSIOLOGICAL RESPONSE TO CRUCIFIXION 17 P. Barbet 1953 Les Cinq Plaies du Christ 2nd ed. Paris: Procure du Carmel de l' Action de Graces. The complicated and much debated issue regarding how the individual expired on the cross has generated widespread debate over the years. While many researchers have believed that death occurred as the result of a ruptured heart 11 due to the story in John 19:34 of the water and blood flowing out of the wound, pathologists such as Zugibe, 12 have ruled this out as medically untenable. Other scholars 13 have regarded asphyxiation as being the cause of death, however the latest research findings have shown the issue to be more complicated, depending upon the manner in which the victim was affixed to the cross. A series of experiments carried out by an American medical examiner and pathologist on college students who volunteered to be tied to crosses, showed that if the students were suspended from crosses with their arms outstretched in the traditional manner depicted in Christian art, they experienced no problems breathing. 14 Thus the often quoted theory that death on the cross is the result of asphyxiation is no longer tenable if the arms are outstretched. According to the physiological response of the students, which was closely monitored by Zugibe, death in this manner is the result of the victim going into hypovolemic shock. 15 Death is this manner can be in, a manner of hours, or days depending on the manner in which the victim is affixed to the cross. If the victim is crucified with a small seat, a sedile, affixed to the uptight for minimum support in the region of the buttocks, death can be prolonged for hours and days. In fact, Josephus reports that three friends of his were being crucified in Thecoa by the Romans who, upon intervention by Josephus to Titus were removed from the crosses and with medical care one survived. 16 If, however, the victims are tied with their hands extended over their heads and left hanging, death can occur within an hour or, in minutes if the victims legs are nailed so that he cannot use his arms to elevate the body to exhale. For exhaling to occur in a normal manner two sets of muscles are needed, the diaphragm and. the intercostalis muscles between the ribs. With the victims being suspended by their arms directly over their heads, these sets of muscles cannot function properly which results in the victims inability to exhale and results in asphyxiation. Eyewitness accounts by prisoners of war in Dacchu during WWII reported that victims suspended from beams by their wrist, which were tied, expired within ten minutes if their feet were weighted or tied down and within one hour if their feet were unweighted and the victim was able to raise and lower himself to permit respiration. Death in this manner, which is one form of crucifixion, was the result of suffocation. 17As a deterrent in the ancient world, many of its victims were crucified where the criminal event took place as was the case with thieves or along the cities busiest thoroughfares. The situation can perhaps best be summed up by Quintilian who wrote that, "whenever we crucify the guilty, the most, crowded roads are chosen, where most people can see and be moved by this fear. For penalties relate not so much to retribution as to their exemplary effect." 18 18 Quintilian (AD 35-95)
Decl 274 As one of the main objectives of this cruel method of execution was its deterrent value, Roman authorities also devised various means whereby the victim could remain on the cross for days in public before eventually expiring. Thus the manner in which the victims were crucified was not fixed by law but appears dependent on the number of individuals involved, the sadistic ingenuity of those carrying out the execution and the time needed for this spectacle to have its maximum deterrent effect.
Giving the victim a proper burial following death on the cross, during the Roman period was rare and in most cases simply not permitted in order to continue the humiliation. Thus the victim was in many cases simply thrown on the garbage dump of the city or left on the cross as food for wild beasts and birds of prey.