The purpose of this study was to examine the acute effects of 3 different stretching methods combined with a warm-up protocol on vertical jump performance. Sixteen young tennis players (14.5 ± 2.8 years; 175 ± 5.6 cm; 64.0 ± 11.1 kg) were randomly assigned to 4 different experimental conditions on 4 successive days. Each session consisted of a general and specific warm-up, with 5 minutes of running followed by 10 jumps, accompanied by one of the subsequent conditions: (a) Control Condition (CC)-5 minutes of passive rest; (b) Passive Stretching Condition (PSC)-5 minutes of passive static stretching; (c) Active Stretching Condition (ASC)-5 minutes of active static stretching; and (d) Dynamic Stretching Condition (DC)-5 minutes of dynamic stretching. After each intervention, the subjects performed 3 squat jumps (SJs) and 3 countermovement jumps (CMJs), which were measured electronically. For the SJ, 1-way repeated measures analysis of variance (CC × PSC × ASC × DC) revealed significant decreases for ASC (28.7 ± 4.7 cm; p = 0.01) and PSC (28.7 ± 4.3 cm; p = 0.02) conditions when compared with CC (29.9 ± 5.0 cm). For CMJs, there were no significant decreases (p > 0.05) when all stretching conditions were compared with the CC. Significant increases in SJ performance were observed when comparing the DC (29.6 ± 4.9 cm; p = 0.02) with PSC (28.7 ± 4.3 cm). Significant increases in CMJ performance were observed when comparing the conditions ASC (34.0 ± 6.0 cm; p = 0.04) and DC (33.7 ± 5.5 cm; p = 0.03) with PSC (32.6 ± 5.5 cm). A dynamic stretching intervention appears to be more suitable for use as part of a warm-up in young athletes.
Service-Oriented Architecture (SOA) and agile methods share common drivers. However, there is a lack of guidelines a SOA team should pursue in order to develop services considering best practices, acceptance tests, distributed teams, contract refactoring, among other issues related to SOA principles and agile practices. This work presents a new method that addresses team concerns and needs aiming at a systematic approach for service development using XP's agile practices and SOA principles. We provide best practices, phases and activities that specifically address XP's core practices and service-oriented best practices. We also provide an example of our proposal in order to demonstrate its applicability.
He has research and teaching interests in computer engineering and science, and electrical and biomedical engineering (see http://faculty.eng.fau.edu/shankar/). He is the director of a college-wide center that focuses on systems issues (http://csi.fau.edu/). In that capacity, he has built up teaching and research collaborations among professors and students from multiple colleges (arts and letters, business, education, engineering, K-12, and science). The collaborative work is documented at several subject specific FAU websites. He has a PhD from the
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