ABSTRACT
Variable resistance (VR) is a methodology that has shown good results in developing muscular strength and power. However, no updated information relates to the use of VR as an activation to trigger post-activation performance enhancement (PAPE). The primary objective of this systematic review and meta-analysis was to review and qualitatively describe studies published between 2012 and 2022 that used VR to generate PAPE in muscle power-dominant sports. The secondary objective was to calculate the effect size of the different power outcomes reported in the selected studies. The search was designed following the PRISMA® guidelines for systematic reviews and meta-analyses and performed in the Web of Science (WOS), Scopus, SPORTDiscus, PubMed, and MEDLINE between 2012 and 2022. The methodological quality and risk of bias were evaluated with the Cochrane Collaboration tool. The main variables were the throwing speed, time in sprint tests, and jump height. The analysis was conducted with a pooled standardized mean difference (SMD) through a Hedges' g test (95% CI). Twenty-two studies were included in the systematic review and ten in the meta-analysis, revealing a trivial effect for throwing speed (SMD = 0.06; CI = 95%: -0.23-0.35; p = 0.69), a small effect for the time in sprint tests (SMD = -0.37; CI = 95%: -0.72--0.02; p = 0.04), and a moderate effect for jump height (SMD = 0.55; CI = 95%: 0.29-0.81; p Ë 0.0001). All forms of VR used for neuromuscular activation effectively triggered PAPE. Specifically, the results showed that activation with VR generates performance increases in time, in sprint tests and jump height, and a trivial effect in throwing tests (speed and distance).
Subject(s)
Sports , Muscle Strength/physiology , MusclesSubject(s)
Infant , Child , Adolescent , Adult , Middle Aged , Humans , Male , Female , Blood Coagulation Disorders/genetics , Antithrombin III/deficiencyABSTRACT
Se aplica la clasificación FAB en 112 casos de LA en menores de 15 años de la Xa. Región en el decenio 1975-1984, identificándose 80 casos de LAL (71,4%), distribuidos en L1=32,1%, L2=34,8% y L3=4,5% y 32 casos de LAM (28,6%), distribuidos em M1=9,8%, M2=11,6%, M3=0,9% y M4=6,3%. La distribuición de los casos de acuerdo al lugar de procedencia fue proporcional a las concentraciones de población de la Xa Región, Veintiún pacientes (18,7%) son aborígenes, con distribuición por sexo, edad, lugar de procedencia y subtipo citológico proporcional al grupo total
Subject(s)
Infant , Child, Preschool , Child , Adolescent , Humans , Male , Female , Leukemia/epidemiology , Acute Disease , Age Factors , Bone Marrow Examination , Chile , Cytodiagnosis , Indians, South American , Leukemia/classification , Leukemia/diagnosis , Sex FactorsABSTRACT
Se comunica el caso de una nina de 13 anos portadora de un sindrome de Chediak-Higashi. La microscopia electronica de la medula osea revelo en los percursores mieloides, grandes granulos especificos y abundantes autofagosomas. Se comentan las contribuciones sobre el conocimiento ultraestructural de este sindrome y los avances en la terapia del mismo
