Biomecanical studies of the spine require data on the weight supported by each body segment studied. The only data available are from post mortem measurements on one old subject. The Barycentremetre, a gamma ray scanner, provides in vivo measurements.Barycentremetre measurements and full spine radiographs with a single reference system, were used to measure the weights of the arms and the remaining body weight supported by each anatomical level of 17 men and 11 women. Their weights are expressed in absolute terms (kg) and as a percentage of the total body weight.The vertebra level of the scapulohumeral joint is also provided. The range of the individual values may justify using of individual values or mean values supplemented by such other anthropometric values as the upper to lower body segment length ratio.