RESUMEN
BACKGROUND: The present study was designed to examine the influence of extreme impact loading induced by jump training on bone mineral density (BMD) and bone mineral content (BMC) in high level jumpers. METHODS: Forty boys volunteered for the study aged 20 to 21 years. They were 22 high level jumpers and 18 controls. Bone mass and body composition measurements were performed by dual-energy X-ray absorptiometry, in the total body and at different sites. RESULTS: The results showed that BMC, BMD, bone area, and lean mass (P<0.0001) were significantly higher in the jumpers compared to the controls. A strong positive correlation was found between lean mass and bone parameters (BMC at the right femur, r=0.80; P<0.01). The values of the same correlation were weak in the control group. In addition, the effects of the regular practice of jumping on the BMD, BMC, and bone area were more pronounced in the lower limbs (P<0.01). These adaptations were site-specific, with increased bone mass at the lower limbs (P<0.01), especially at the legs, right and left leg (LRL) (P<0.05). It appears that the time dedicated to this activity may be account for the difference between jumpers and controls. CONCLUSIONS: The practice of high level jump starting at pubertal age generates an increase and an acquisition of the bone mass in males. This adaptation is further enhanced by the times dedicated for this activity. Therefore, it would be interesting to program jumping activities daily to conserve bone mineral and to prevent osteopenia.
Asunto(s)
Densidad Ósea/fisiología , Huesos/metabolismo , Ejercicio Pliométrico , Absorciometría de Fotón , Fenómenos Biomecánicos , Composición Corporal , Fémur/fisiología , Humanos , Pierna/fisiología , Masculino , Resistencia Física , Aptitud Física , Pubertad , Deportes , Adulto JovenRESUMEN
Short-course chemotherapy has not been previously assessed in tuberculous serositis. In this study, 18 patients with tuberculous serositis were studied. 600 mg of rifampicin, 300 mg of isoniazid and 25 mg of pyridoxine were given daily for 6 months. 14 patients completed the therapeutic regimen and were evaluated. 11 of these showed excellent results on the long-term follow-up (18-24 months) and 3 of shorter-term follow-up (9-12 months). Short-course chemotherapy appears to be efficacious in the treatment of tuberculous serositis. However, further and larger trials are recommended.
Asunto(s)
Isoniazida/uso terapéutico , Piridoxamina/uso terapéutico , Rifampin/uso terapéutico , Serositis/tratamiento farmacológico , Tuberculosis/tratamiento farmacológico , Adolescente , Adulto , Anciano , Quimioterapia Combinada , Femenino , Humanos , Masculino , Persona de Mediana Edad , Factores de TiempoRESUMEN
The use of a microtechnique (modified nitrous acid extraction) to test samples from 150 school children and from patients with acute follicular tonsillitis has indicated that group A streptococci in the throat can be identified from tonsillar scrapings in 30 min. The results are comparable to the grouping results obtained by standard throat culture techniques and the Lancefield procedure for grouping. No cross-reaction with other bacteria or cellular material occurs. Study has also shown that the nitrous acid extraction yields three- to fourfold more polysaccharides than the Lancefield hot-HCl of Fuller formamide techniques. The use of the microtechnique leads to another 20-fold concentration of the antigen. Immune salting-out effect could be obtained with 1.00 M sodium acetate. Such molarity is too low to cause nonspecific slating out. It leads to a strong ampliciation of the precipitin reaction.