Posture deformities affect the vital organs functions. The kyphosis leads to distortion of the body mechanical power and lead to the reduction of the body abilities and skills. Descriptive study conducted to investigate the rotated back distortions effect on the players' performance, the morphological and physiological measurements. 19 Supreme long distances runners represent national clubs recorded in the Egyptian Athletics Federation during 2006/2007. The morphological and physiological variables were measured, blood samples were investigated and VO2max were calculated. We found that there were a statistically significant differences and correlation between the rotated back of athletes and the normal posture group in the performance records, morphological and physiological measurements during rest and recovery, There is an inverse relationship between rotations [Kyphosis] degree and the chest diameter (0.784), Systolic blood pressure value (-0.857), Diastolic blood pressure value (0.898), heart rate (-0.741), vital capacity (0.784), VO2max (-0.741), hemoglobin ratio (-0.714) and direct relation between kyphosis and lactic acid level after 3 min. from performing efforts (0.735). We concluded that we should prepare the trainers to improve their scientific and practical awareness of the danger of posture deviation which affect the players` performance.
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