The aim of this study was to compare the effects of 6 weeks of vertical, horizontal, or combined vertical and horizontal plyometric training on muscle explosive, endurance, and balance performance. Forty young soccer players aged between 10 and 14 years were randomly divided into control (CG; n = 10), vertical plyometric group (VG; n = 10), horizontal plyometric group (HG; n = 10), and combined vertical and horizontal plyometric group (VHG; n = 10). Players performance in the vertical and horizontal countermovement jump with arms, 5 multiple bounds test (MB5), 20-cm drop jump reactive strength index (RSI20), maximal kicking velocity (MKV), sprint, change of direction speed (CODS), Yo-Yo intermittent recovery level 1 test (Yo-Yo IR1), and balance was measured. No significant or meaningful changes in the CG, apart from small change in the Yo-Yo IR1, were observed while all training programs resulted in meaningful changes in explosive, endurance, and balance performance. However, only VHG showed a statistically significant (p ≤ 0.05) increase in all performance test and most meaningful training effect difference with the CG across tests. Although no significant differences in performance changes were observed between experimental groups, the VHG program was more effective compared with VG (i.e., jumps, MKV, sprint, CODS, and balance performance) and HG (i.e., sprint, CODS, and balance performance) to small effect. The study demonstrated that vertical, horizontal, and combined vertical and horizontal jumps induced meaningful improvement in explosive actions, balance, and intermittent endurance capacity. However, combining vertical and horizontal drills seems more advantageous to induce greater performance improvements.

Comparing the records of fishing communities made in the sixteenth to twentieth centuries to the archaeological evidence of the sixth millennium BP, the authors propose a sophisticated prehistoric network for the coastal people of northern Chile. Residential seashore settlements link both along the coast to temporary production sites for fish, and inland to oasis-based providers of products from the uplands and salt flats. Sharing values and kinsfolk, the coastal communities must have travelled extensively in boats which, like their modern counterparts, made use of floats of inflated sealskin.

ResumenEl presente artículo explora la interacción social en la región atacameña a partir del estudio de sus pinturas rupestres. Mediante el estudio cuantitativo y cualitativo de las distribuciones pictóricas, tanto por las estructuras compositivas como por los íconos claves que aparecen simultáneamente en dos o más localidades rupestres, se determinan flujos diferenciales de información visual. Esta circulación de conocimiento y personas habría operado como expresión de relaciones sociales preferenciales entre las distintas comunidades del desierto de Atacama.Palabras claves: interacción social -pinturas rupestresflujos de información visual.Abstract This article explores social interaction in the Atacama region through the local rock art paintings. Using a quantitative and qualitative study of pictorial distribution, including both compositional structures and key icons that appear simultaneously in two or more areas with rupestrian art sites, we can determine the presence of differential visual information flows. This flow of knowledge and people would have operated as an expression of preferential social relations between the different Atacama Desert communities.Key words: social interaction -rock art paintingsvisual information flows.Recibido: diciembre 2011. Aceptado: marzo 2012. Figura 1.Ubicación geográfica de las áreas incluidas en el estudio.

Sedentary overweight or obese adult (age<60 years) women, allocated in type 2 diabetes mellitus (T2DM, =13), dyslipidemia alone (DYS,=12), dyslipidemia associated with hyperglycaemia (DYSHG, N=12), or healthy control (CON, =10) groups, had their lipid, glucose, blood pressure, endurance performance, and anthropometry variables assessed before and after 16 weeks of a thrice-weekly high-intensity interval training (HIIT) program. Triglycerides reduced significantly (<0.05) in all groups, and high-density lipoprotein increased (<0.01) in T2DM, DYS and DYSHG; however, low-density lipoprotein reduced (<0.05) only in DYSHG, and total cholesterol reduced (<0.01) only in DYS and DYSHG. Fasting glucose reduced (<0.05) significantly in T2DM, DYS and DYSHG, but with higher decreases in T2DM and DYSHG. Blood pressure, endurance performance and body composition improved (<0.05) in all groups. The HIIT program was effective for restoring lipid profile of DYS and DYSHG, and fasting glucose of DYSHG to levels similar to those of CON, with a weekly time commitment 25% to 56% lower than the minimum recommended in current exercise guidelines. These findings suggest that HIIT may be a time-efficient intervention for counteracting dyslipidemia.

The San Salvador River in northern Chile is a tributary of the Loa, the only river that traverses the Atacama Desert from the mountains to the Pacific. Recent investigations along the San Salvador River revealed the presence of a Formative period village site and associated cemetery approximately 110 km inland from the Pacific Ocean. Bioarchaeological and biogeochemical analyses conducted on human skeletal remains recovered from the San Salvador Cemetery allowed us to better understand the site’s role as an intermediary for coast/interior relations during the Middle Formative (500 B.C.–A.D. 100). Evidence from material culture and human remains at San Salvador suggests that this population was involved in exchange networks that united the oases of the Atacama Desert with the Pacific Ocean. Isotopic data support this notion, as the population demonstrates great variability in both the protein (marine and terrestrial) and carbohydrate components of their diet. During this period, communal economies produced surpluses used in a network of exchange for foods, prestige goods, and ideas. These ties were not coincidental but, rather, part of a regional economic structure that remains only partly explored.