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INTRODUCTION: Self-limiting sternal tumors of childhood (SELSTOC) are rapidly growing sternal lesions that tend to resolve spontaneously. Patients have no history of infection, trauma, or neoplasms, and the most likely etiologyis an aseptic inflammatory reaction of unknown origin. The differential diagnosis includes a wide spectrum of lesions such as tumors, infections, malformations, or anatomic variants. MATERIAL AND METHODS: We analyzed all cases of sternal masses in pediatric patients seen between 2012 and 2019; five of these had findings compatible with SELSTOC. We retrospectively recorded patients' race, sex, age, clinical presentation, laboratory findings, imaging tests, treatment, and follow-up. RESULTS: We present five cases of rapidly growing sternal lesions whose clinical and radiological features are compatible with SELSTOC. In the absence of alarming symptoms and laboratory markers, watchful waiting could be an appropriate therapeutic approach. However, patients with some findings such as fever, elevated acute phase reactants, and/or comorbidities could require therapeutic interventions such as antibiotics or percutaneous drainage. In our series, depending on the clinical presentation and the patient's comorbidities, different therapeutic approaches were adopted (a conservative approach in two patients, antibiotics in three patients, and percutaneous drainage in one patient). In all cases, the sternal lesion was absent at discharge and/or at later follow-up visits. CONCLUSION: Radiologists and pediatricians must be aware of this entity and the different diagnostic and therapeutic approaches to rapidly growing sternal lesions in pediatricpatients because recognizing SELSTOC can avoid unnecessary diagnostic tests and/or disproportionate therapeutic strategies.

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OBJECTIVE: Puerperium is the period during which the physiological changes that have taken place during pregnancy revert and the uterus involutes until it reaches its normal size. This is a period of intense systemic changes, and diagnosing complications in this period is a challenge for both gynecologists and radiologists. This paper reviews the complications that can occur during puerperium, classifying them according to the pathophysiological mechanisms involved: the prothrombotic state, hemodynamic and hormonal changes, rapid uterine growth, changes associated with endothelial damage (preeclampsia, eclampsia, and HELLP syndrome), and postoperative complications in patients undergoing cesarean sections. CONCLUSION: Puerperal complications represent a diagnostic challenge. Understanding the pathophysiological mechanisms underlying these complications is fundamental for choosing the most appropriate imaging technique to ensure the correct diagnosis in each case.

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To examine the prevalence of active commuting to school (ACS) in 4 to 6 year old children and individual and social factors associated with it. Cross-sectional study including 1,159 children from Cuenca and Ciudad Real (Castilla-La Mancha, Spain). ACS, population area, and socioeconomic status (SES) were self-reported by parents. Body mass index and cardiorespiratory fitness (CRF) were measured using standard procedures. Binary logistic regression models were used to assess the strength of association between the mode of commuting (ACS/no-ACS) and individual (weight status and CRF) and social (population area and SES) factors. Forty-six percent of the children ACS. The probability of ACS was greater in boys and girls from families of low/medium-low SES and in girls who lived in urban areas. ACS was not associated with weight status and CRF. Effective interventions need to be promoted, especially in children from families of high SES and those living in rural areas.

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The aim of this study was to analyze the mediation role of cardiorespiratory fitness and waist circumference in the association between muscular strength and cardiometabolic risk. A cross-sectional study involved first-year college students (n = 370) from a Spanish public university was performed. We measured weight, height, waist circumference, blood pressure, biochemical variables, maximum handgrip strength assessment, and cardiorespiratory fitness. We calculated handgrip dynamometry/weight and a previously validated cardiometabolic risk index. Analysis of covariance models was conducted to test differences in cardiometabolic risk values across muscular strength, cardiorespiratory fitness, and waist circumference categories, controlling for confounders. Hayes' PROCESS macro was used for the multiple mediation analysis. The relationship between muscular strength and cardiometabolic risk did not remain significant (c' = 1.76 [1.4]; P > .05) in a multiple serial bootstrapped mediation model including cardiorespiratory fitness and waist circumference as mediators when controlling for age and sex. According to the indirect effect, the significant paths in the model mediating this relationship between muscular strength and cardiometabolic risk index were as follows: muscular strength → waist circumference → cardiometabolic risk index (-4.899; 95% CI: -6.690; -3.450) and muscular strength → cardiorespiratory fitness → waist circumference → cardiometabolic risk index (-0.720; 95% CI: -1.316; -0.360). Both cardiorespiratory fitness and waist circumference mediate the association between muscular strength and cardiometabolic risk in young adults. Thus, our results place cardiorespiratory fitness and waist circumference as the main targets of physical activity programmes aimed at preventing cardiometabolic diseases.

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BACKGROUND AND AIMS: Exercise training can improve health of patients with metabolic syndrome (MetS). However, which MetS factors are most responsive to exercise training remains unclear. We studied the time-course of changes in MetS factors in response to training and detraining. METHODS AND RESULTS: Forty eight MetS patients (52 ± 8.8 yrs old; 33 ± 4 BMI) underwent 4 months (3 days/week) of supervised aerobic interval training (AIT) program. After 1 month of training, there were progressive increases in high density lipoprotein cholesterol (HDL-c) and reductions in waist circumference and blood pressure (12 ± 3, -3.9 ± 0.4, and -12 ± 1%, respectively after 4 months; all P < 0.05). However, fasting plasma concentration of triglycerides and glucose were not reduced by training. Insulin sensitivity (HOMA), cardiorespiratory fitness (VO2peak) and exercise maximal fat oxidation (FOMAx) also progressively improved with training (-17 ± 5; 21 ± 2 and 31 ± 8%, respectively, after 4 months; all P < 0.05). Vastus lateralis samples from seven subjects revealed that mitochondrial O2 flux was markedly increased with training (71 ± 11%) due to increased mitochondrial content. After 1 month of detraining, the training-induced improvements in waist circumference and blood pressure were maintained. HDL-c and VO2peak returned to the values found after 1-2 months of training while HOMA and FOMAx returned to pre-training values. CONCLUSIONS: The health related variables most responsive to aerobic interval training in MetS patients are waist circumference, blood pressure and the muscle and systemic adaptations to consume oxygen and fat. However, the latter reverse with detraining while blood pressure and waist circumference are persistent to one month of detraining.

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