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Objective: Describe the perception of adolescents aged between 12 and 16 years, in Piedecuesta (Santander), in 2016, about the facilitators and barriers that influence physical activity. Methodology: Qualitative analysis from a phenomenological approach, with the participation of 20 adolescents who talked about the practice, benefits, environments, influence and company in connection with physical activity , to identify barriers and facilitators, through semi-structured interviews and a focus group. Results: Physical activity was limited to physical education classes in most cases. The main companionin extracurricular physical activity was the parent of the same sex. Physical activity represented an opportunity for enjoyment, improvement of physical and mental health, as well as body composition, and to have a break in their daily routine. Lack of time due to academic commitments was the mainreason for not doing physical activity. Public places were not always available and they were often not considered to be safe. Space and facilities at school were inadequate, and their use was restricted. Conclusions: The school is an important point of convergence for doing physical activity, suggesting the need to strengthen the curriculum in this respect; this environment is a potential facilitator to increasing the level of physical activity in adolescents. It can also be seen as a barrier, given that the practice interferes with academic activities. Improvements in safety and aesthetic appeal in the surrounding community areseen as a facilitator to promoting physical activity., Objetivo. Describir los facilitadores y barreras que influyen en la participación en la actividad física (AF) de adolescentes escolarizados. Métodos. Análisis cualitativo desde un enfoque fenomenológico con la participación de 20 adolescentes escolarizados entre 12 y 16 años, que mediante entrevistas semiestructuradas y grupos focales conversaron sobre temas relacionados con la práctica, beneficios, entornos e influencia y compañía frente a la AF. La información fue procesada con el programa NVivo Pro. Resultados. La práctica de AF se limitaba a las clases de educación física en la mayoría de los casos. El compañero principal en la AF extracurricular era el padre del mismo sexo. La AF representaba una oportunidad para romper con la rutina diaria, el disfrute, mejorar la salud física y mental, y mejorar la contextura corporal. La falta de tiempo por compromisos académicos fue la razón principal para no realizar AF. Los espacios públicos no siempre estaban disponibles, a menudo no se consideraban seguros. En la escuela, el espacio y las instalaciones eran inadecuados, y el uso estaba restringido. Conclusiones. La escuela es un punto de convergencia importante para la práctica de AF, lo que sugiere la necesidad de fortalecer el plan de estudios de educación física. A pesar de esto, se percibe que la AF interfiere con las actividades académicas. El vecindario también es un espacio importante para la AF y las mejoras en la seguridad y el atractivo estético de las áreas recreativas públicas tienen el potencial de aumentar el nivel de práctica de AF.

El Síndrome de Estrés Tibial Medial (SETM) es una de las patologías más reportadas e incapacitantes en el personal militar. Debido a que los músculos de la extremidad inferior desempeñan una labor importante en la atenuación de las fuerzas de impacto al correr y aterrizar, la deficiencia y las asimetrías en la función neuromuscular, se asocian con un mayor riesgo de presentar lesiones musculoesqueléticas (LME). OBJETIVO: determinar los factores de riesgo para el SETM asociados a la cinética del countermovement jump (CMJ) en cadetes en formación. METODOLOGIA: una cohorte de 164 cadetes de primer semestre fue seguida prospectivamente durante 24 semanas. Al inicio de la investigación, se registraron los datos antropométricos y demográficos de los participantes, y, se les interrogo acerca de algunos de sus hábitos de vida y antecedentes en el uso de material ortopédico, lesiones en los miembros inferiores y SETM. La altura del salto (cm), la tasa de desarrollo de la fuerza en la desaceleración excéntrica (EDRFD [N/s*kg]), la asimetría de la EDRFD (% y %/VN), la fuerza concéntrica media (CMF [N*kg]), la asimetría de la CMF (% y %/VN), la fuerza pico en el aterrizaje (PLF [N*kg]), y la asimetría de la PLF (% y %/VN), se evaluaron a través del CMJ bilateral con un par de plataformas de fuerza uniaxial. Finalizado el seguimiento, se identificaron los cadetes que presentaron SETM mediante la historia clínica. RESULTADOS: al final del estudio quedaron 91 hombres y 32 mujeres (n= 123). La incidencia del SETM fue de 13% (n= 16). En el análisis bivariado, una mayor asimetría de la EDRFD (9,4% vs. -3,4%), el sexo femenino (RR= 2,84; IC 95%= 1,16-6,94), la procedencia rural (RR= 2,65; IC 95%= 1,04-6,72) y el antecedente de SETM (RR= 5,71; IC 95%= 2,23-14,62), se asociaron de forma significativa con el SETM (p≤0.05). En la regresión logística, una mayor asimetría de la EDRFD (OR= 1,03; IC 95%= 1,00-1,07), el sexo femenino (OR= 4,91; IC 95%= 1,38-13,37) y la procedencia rural (OR= 4, Medial Tibial Stress Syndrome (MTSS) is one of the most frequent pathologies in military personnel. As the muscles of the lower extremity contribute to the attenuation of impact forces in activities such as running and jumping, neuromuscular performance deficiencies and asymmetries may be associated with an increased risk for musculoskeletal injuries. PURPOSE: to determine the kinetic risk factors associated with MTSS through the bilateral countermovement jump (CMJ) in army cadets. METHODS: ethical approval was granted by the General José María Córdova Military School of Cadets where the study was conducted. This observational study was executed in a cohort of 123 cadets (followed for 24 weeks) who entered to the military school in 2017. Anthropometric, demographic data and MTSS history were recorded. Jump height (cm), peak landing force (N*kg), peak landing force asymmetry (%), concentric mean force (N*kg), concentric mean force asymmetry (%), eccentric deceleration rate of force development (EDRFD [N/s*Kg]) and EDRFD asymmetry (%), were evaluated through the bilateral CMJ on a pair of uniaxial force platforms. After the follow-up, the cadets with MTSS were determined through the clinical history. RESULTS: the incidence of MTSS was 13% (n= 16). Greater EDRFD asymmetry (9,4% vs. -3,4%), female sex (RR= 2.84; 95% CI= 1.16-6.94), rural provenance (RR= 2.65; 95% CI= 1.04-6.72), and previous history of MTSSM (RR= 5.71; 95% CI= 2.23-14.62), were significantly associated with MTSS (p≤0.05). In the logistic regression, greater EDRFD asymmetry (OR= 1.03; 95% CI= 1.00-1.07), female sex (OR= 4.91; 95% CI = 1.38-13.37) and rural provenance (OR= 4.82; 95% CI= 1.04-6.72), were significantly associated with MTSS (p≤0.05). Previous history of MTSS was significant in p≤0.1 (OR= 8.95; 95% CI= 0.68-118.73). The predictive model was significant for the MTSS (p≤0.01), had a sensitivity of 31.3% and a specificity of 99.1% (overall prognosis of 90.2%). CONCLUSIONS: while we identified im, Universidad del Rosario, Escuela Militar de Cadetes General José María Córdova, Se le envía correo 15 jul 2019. Hemos realizado la publicación de su documento, el cual puede consultar en el siguiente enlace: http://repository.urosario.edu.co/handle/10336/19914 Usted escogió la opción "Restringido (Temporalmente bloqueado)", por lo que el documento ha quedado con embargo hasta el 10 de julio de 2021 en concordancia con las Políticas de Acceso Abierto de la Universidad. Si usted desea dejarlo con acceso abierto antes de finalizar dicho periodo puede enviar un correo a esta misma dirección realizando la solicitud. Tenga en cuenta que los documentos en acceso abierto propician una mayor visibilidad de su producción académica.

The main aim of this study was to evaluate the concordance between the indirect V̇O2max value estimated by the distance achieved in the Yo-Yo intermittent recovery test level 1 (YYIR1) and the direct measurement during a treadmill protocol test (TP) in elite youth soccer players. Methods: Fourteen elite under 20 year’s old soccer players from a first division soccer club were evaluated. Test were performed one week apart. In both tests V̇O2, was measured with an ambulatory gas exchange measurement. YYIR1 estimated V̇O2max was calculated using the equation described by Bangsbo et al. (2008) and in TP was calculated using American College of Sport Medicine equation. Results: Lin´s concordance correlation coefficient between direct V̇O2max in TP and estimated V̇O2max in YYIR1=0.271 (poor concordance). Conclusions: The poor concordance between direct and indirect V̇O2max measurements in TP and YYIR1, indicated that in an elite population both test, are not good indirect predictors of V̇O2max, reached in those tests using current predictive equations. The YYIR1 is well established as a performance-relevant test in elite players, but our data suggests that due to its poor concordance with imprecise estimation of V̇O2max, which should be measured directly if this variable is of specific interest.

The main aim of this study was to evaluate the concordance between the indirect V̇O2max value estimated by the distance achieved in the Yo-Yo intermittent recovery test level 1 (YYIR1) and the direct measurement during a treadmill protocol test (TP) in elite youth soccer players. Methods: Fourteen elite under 20 year’s old soccer players from a first division soccer club were evaluated. Test were performed one week apart. In both tests V̇O2, was measured with an ambulatory gas exchange measurement. YYIR1 estimated V̇O2max was calculated using the equation described by Bangsbo et al. (2008) and in TP was calculated using American College of Sport Medicine equation. Results: Lin´s concordance correlation coefficient between direct V̇O2max in TP and estimated V̇O2max in YYIR1=0.271 (poor concordance). Conclusions: The poor concordance between direct and indirect V̇O2max measurements in TP and YYIR1, indicated that in an elite population both test, are not good indirect predictors of V̇O2max, reached in those tests using current predictive equations. The YYIR1 is well established as a performance-relevant test in elite players, but our data suggests that due to its poor concordance with imprecise estimation of V̇O2max, which should be measured directly if this variable is of specific interest.