The aim of the present study was to assess effects of technique of execution, age and player's role on serve and attack efficacy. A total of 1.100 sen'es and 1.165 attacks from under-19, 927 serves and 1.015 attacks from umler-21, and 1.564 serves and 1.854 attacks from senior were assessed through video match analysis. Techniques considered for serve were standing serve (SS), jump serve (JS) and float jump serve (FJS),and for attacks were spike and shot. All players were analysed according to their role (defenders or blockers). Results showed that defenders in under-19 and under-21 had better efficacy using SS and FJS, while in senior category the best efficacy was obtained through JS and FJS. Blockers had better efficacy using SS and F JS in all categories. The attack efficacy seems to be independent of player role, although it is related to technique and age. While in senior category attack efficacy was similar using spike and shot, in younger categories it was slightly higher when using spike. This study suggests that sen'e and attack present d!fferent efficacy profiles when considered the technique of execution, player role and age, and therefore it shoultl be considered when planning training programs for teams throughout different phases of athlete development.

171 Background: Esophagectomy is a major surgery associated with significant morbidity and mortality. There is growing evidence in literature that the minimally invasive approach in esophagectomy (MIE) may decrease morbidity. The aim of this study was the comparative analysis of the outcomes between MIE and open esophagectomy (OE) for esophageal cancer. Methods: Analysis (case-control study) of a prospective database with esophageal cancer cases submitted to curative intent surgery, between May 2006 and October 2014, in an Upper GI Surgery Unit. For this analysis, cases of non-resectional surgery were excluded. Results: From the initial population (n = 79), 65 cases (Group A: 24 MIE - 13 totally MIE and 11 hybrid MIE; Group B: 41 OE, including 5 cases of conversion from MIE) were included. Both groups were matched for gender, age, comorbidities, BMI, tumor location and histology, staging (cT and cN), neoadjuvant therapy and type of surgery. The presence of postoperative morbidity was 37,5% in MIE vs 61% in OE (p = 0,058), with a rate of respiratory complications of 16,7% and 22%, respectively (p = ns). Statistically significant differences were seen in Clavien classification of postoperative morbidity (p = 0,018) and in postoperative mortality (MIE 0% vs OE 22%, p = 0,021). Conclusions: The results of this case-control study provide further evidence for the feasibility and possible improvements in the postoperative morbidity and mortality of MIE, when performed in differentiated centers.

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