RESUMEN
OBJECTIVES: With the premise that physical education classes should promote physical activity by teaching and learning fundamental motor skills, this study aimed to evaluate the fundamental motor skill proficiency of primary school students and determine the level of achievement of established learning outcomes for fundamental motor skills, as specified in the Polish National Physical Education Curriculum. DESIGN AND METHODS: A cross-sectional design was used for this study. The sample consisted of 2605 children and adolescents enrolled in grades 1-3 (ages 7-9, nâ¯=â¯1165), 4-6 (ages 10-12, nâ¯=â¯837), and 7-8 (ages 13-14, nâ¯=â¯603), including 1353 boys and 1252 girls. The Fundamental Motor Skills in Sport test, a qualitative and process-oriented assessment tool, was used to evaluate fundamental motor skills. The Fundamental Motor Skills in Sport test evaluates the following movement skills: hurdles, jumping rope, forward roll, ball bouncing, ball throwing and catching, and kicking and stopping a ball. RESULTS: The desired level of overall fundamental motor skill proficiency was achieved by only 2â¯% of students. An elementary level of fundamental motor skill proficiency was demonstrated by an additional 3.5â¯% of students. Further, the results showed that only 10-30â¯% of students had achieved mastery or were close to achieving mastery in a given fundamental motor skill. The skill with the lowest level of proficiency was jumping rope, which only 11â¯% of students had mastered or were near to mastering. CONCLUSIONS: The present study of a large, nationally representative sample of primary school students in Poland indicates that the vast majority (approximately 94â¯%) of them demonstrated insufficient fundamental motor skill proficiency. This may greatly hinder effective, safe, and healthy participation in lifelong physical activity.
Asunto(s)
Ejercicio Físico , Destreza Motora , Masculino , Niño , Femenino , Adolescente , Humanos , Polonia , Estudios Transversales , Instituciones AcadémicasRESUMEN
Fundamental motor skills (FMS) are essential for enjoyable, confident and skillful participation in physical activity across the lifespan. Due to the alarming low level of FMS proficiency in children and adolescents worldwide, the development of motor competency is an urgent issue for physical education. The promotion and implementation of a systematic process of teaching and learning FMS should be a physical education priority. Accordingly, effective assessment tools for evaluating FMS should be adopted or developed. Because FMS assessment for both children and adolescents need further effective solutions, the primary aim of this study was to develop the new age-related test of FMS (Fundamental Motor Skills in Sport test, in Polish: Test Fundamentalnych Umiejetnosci Ruchowych w Sporcie, FUS). The secondary aim of this study was to establish validity and inter-rater, intra-rater, test-retest reliabilities and internal consistency of the FUS test. The FUS test involves six sport skill-based tasks: hurdling, jumping rope, forward roll, ball bouncing, throwing and catching a ball, and kicking and stopping a ball. Two hundred sixty-four Polish students in grades 1-3 (7-9 yrs; n = 81), 4-6 (10-12 yrs; n = 89) and 7-8 (13-14 yrs; n = 94), including 139 girls and 125 boys completed the FUS test. The content validity index for all items was notably high. Both inter-rater and intra-rater reliability showed substantial to almost perfect agreement, with observed agreements for FUS skills between 78.5 and 93.1%. Ball bouncing had a moderate correlation with the forward roll and throwing and catching, while other correlations were low or insignificant. ICC values, ranging from 0.95 to 0.97, confirmed excellent test-retest reliability. The results of our study provide evidence that the FUS test is valid, reliable, and feasible to administer in school settings. Therefore, this tool test has the potential to support deliberate practice and improve motor competence by providing a standardized and structured approach to measuring FMS among school-aged children and adolescents.
Asunto(s)
Destreza Motora , Deportes , Masculino , Femenino , Humanos , Niño , Adolescente , Reproducibilidad de los Resultados , Ejercicio Físico , EstudiantesRESUMEN
Microglia are myeloid cells residing in the central nervous system that participate in inflammatory responses and could promote injury and repair. Gliomas attract microglia and polarize them into tumor-supporting cells that participate in matrix remodeling, invasion, angiogenesis, and suppression of adaptive immunity. Although signaling pathways and critical regulators underlying classical inflammation are well established, signal transduction and transcriptional circuits underlying the alternative activation of microglia are poorly known. Using primary rat microglial cultures exposed to glioma conditioned medium or lipopolysaccharide (LPS), we demonstrate that microglia adapt different fates and polarize into pro-inflammatory or alternatively activated cells. Glioma-derived factors increased cell motility, phagocytosis, and sustained proliferation of microglial cells that was mediated by enhanced focal adhesion kinase and PI-3K/Akt signaling. The signals from glioma cells induced ERK and p38 MAPK but not JNK signaling and failed to activate pro-inflammatory Stat1 and NFκB signaling in microglial cells. Transcriptome analysis of microglial cultures at 6 h after exposure to glioma-conditioned medium or LPS revealed different patterns of gene expression. Glioma-induced activation was associated with induction of genes coding for ID (inhibitor of DNA binding) 1/3 and c-Myc, markers of the alternative phenotype Arg1, MT1-MMP, CXCL14, and numerous cytokines/chemokines implicated in immune cell trafficking. Many classical inflammation-related genes and signaling pathways failed to be induced. Our study indicates for the first time molecular pathways that direct microglia toward the pro-invasive, immunosuppressive phenotype.
Asunto(s)
Carcinogénesis/genética , Movimiento Celular/fisiología , Glioma/patología , Microglía/fisiología , Transducción de Señal/fisiología , Animales , Animales Recién Nacidos , Carcinogénesis/efectos de los fármacos , Movimiento Celular/efectos de los fármacos , Proliferación Celular , Corteza Cerebral/citología , Medios de Cultivo Condicionados/farmacología , Citocinas/metabolismo , Inhibidores Enzimáticos/farmacología , Perfilación de la Expresión Génica , Regulación Neoplásica de la Expresión Génica/efectos de los fármacos , Regulación Neoplásica de la Expresión Génica/genética , Lipopolisacáridos/farmacología , Análisis de Secuencia por Matrices de Oligonucleótidos , Fagocitosis/efectos de los fármacos , Proteínas Serina-Treonina Quinasas/metabolismo , Ratas , Ratas Wistar , Transducción de Señal/efectos de los fármacos , Factor de Crecimiento Transformador beta1/metabolismo , Quinasa de Factor Nuclear kappa BRESUMEN
Neuroprotective and/or neuroregenerative activity of FK506, its derivatives, and to a lesser extent cyclosporin A (CsA) in animal models of neurodegenerative diseases of different etiology have been reported. Here, we verified a hypothesis that the most likely mechanism of their neuroprotective action is inhibition of the early steps of inflammatory activation of microglia by interference with mitogen-activated protein kinase (MAPK) signaling. The effect of immunosuppressants on lipopolysaccharide (LPS)-induced changes in morphology, proliferation, and motility of rat primary microglial cultures was evaluated. FK506 and CsA directly inhibited LPS-induced microglia activation and inflammatory responses. While both drugs efficiently reduced the expression of iNOS and the release of nitric oxide, only FK506 strongly inhibited the expression of Cox-2 and secretion of the mature form of IL-1ß. FK506 strongly reduced LPS-induced activation of MAPK, and its downstream signaling crucial for inflammatory responses. Comparative analysis of global gene expression in rat ischemic brains and in LPS-stimulated microglial cultures revealed many genes and signaling pathways regulated in the same way in both systems. FK506 treatment blocked a majority of genes induced by an ischemic insult in the cortex, in particular inflammatory/innate immunity and apoptosis-related genes. Microglia-mediated inflammation is considered as one of the most important components of brain injury after trauma or stroke; thus, effective and multifaceted blockade of microglial activation by FK506 has clinical relevance and potential therapeutic implications.
Asunto(s)
Inmunosupresores/farmacología , Microglía/efectos de los fármacos , Microglía/metabolismo , Accidente Cerebrovascular/metabolismo , Tacrolimus/farmacología , Animales , Ciclooxigenasa 2/genética , Ciclooxigenasa 2/metabolismo , Inflamación/tratamiento farmacológico , Inflamación/metabolismo , Interleucina-1beta/metabolismo , Lipopolisacáridos/farmacología , Proteínas Quinasas Activadas por Mitógenos , Ratas , Accidente Cerebrovascular/tratamiento farmacológico , Tacrolimus/uso terapéuticoRESUMEN
The invasion of tumour cells into brain tissue is a pathologic hallmark of WHO grades II-IV gliomas and contributes significantly to the failure of current therapeutic treatments. Activated microglial cells are abundant in brain tumours and may support tumour invasiveness. We have previously demonstrated that cyclosporin A (CsA) can affect growth of glioma cells in vitro by inhibiting signalling pathways, which are essential for tumour proliferation and invasiveness. In this work, we demonstrate that migration of EGFP-transfected glioblastoma cells in organotypic brain slices was significantly inhibited by treatment with CsA. On average 77% of untreated cells migrated beyond 500 mum, while only 28-33% cells migrated as far in the brain slices treated with CsA (P < 0.001). This inhibitory effect on glioblastoma invasion was lost when glioblastoma cells were injected into microglia-depleted brain slices. Moreover, CsA significantly inhibits intracranial glioma growth in vivo. We demonstrate that microglia-derived factors increase glioma invasiveness in Matrigel assay in vitro and this is associated with activation of the PI-3K/Akt signalling pathway. The invasion promoting effect of microglia is abolished in the presence of CsA. Furthermore, glioma-derived soluble factors induce morphological transformation of microglia and activate MAPK signalling, although production of pro-inflammatory factors was not observed. Our findings that CsA interferes at clinically relevant concentrations with the tumour-promoting role of microglia and impairs invasive growth of glioma cells in vivo may provide a novel therapeutic strategy against gliomas.