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Abstract:The aim of this study was to investigate the effect of weight cutting and 18 hours rehydration in wrestlers' techniques performance. Methods: twenty-five men elite wrestlers participated in study, they randomly are divided into: group A (age of 18.38 ± 1.32 years, height 1.70 ± 0.04 m, weight 71.11 ± 11.80 kg) and group B (age of 21.00 ± 2.08 years, height 1.75 ± 0.04 m, weight 76.25 ± 12.55 kg). Body composition, biomechanical analysis were measure before dehydration, after weight cutting and after 18 hours rehydration. All subjects were dehydrated 3.5% of their body weight. Group A lost body weight in sauna and group B dehydrated according to active method. Single takedown technique's biomechanical parameters are measured in six points of body (both side). Three dimensional motion analysis and Skillspector software (version 1.3.2) is used to calculated right and left shoulder, pelvis, and knee linear velocity, left/right trunk, thigh segment angular velocity, and position. Reflective body markers attached all of the subjects' joints, and we used hero 3 camera @15fps/1440 p. Results with repeated measure and independent T-test showed that biomechanical characteristics decrease significantly after weight cutting (P < 0.05). Compare groups showed that dehydration by sauna have significantly more negative effect than active method. 18-hour rehydration period is not sufficient for recovery.