Changes in the location of cutaneous melanoma over the past 30 years. A retrospective observational study. / Cambios en la localización del melanoma cutáneo en los últimos 30 años. Estudio observacional retrospectivo.

BACKGROUND: The location of cutaneous melanoma is associated with photoexposure. OBJECTIVES: To retrospectively analyze changes in the location of cutaneous melanoma over the past 30 years. PATIENTS AND METHODS: All patients treated at our hospital for cutaneous melanoma from 1988 through 2017 were prospectively collected. Data obtained in cases diagnosed from 1988 through June 2006 were compared to those diagnosed from July 2006 through 2017. RESULTS: A total of 1937 patients (876 men and 1061 women; median age, 57 years; interquartile range 27) were diagnosed with primary cutaneous melanoma. The location of melanoma was head and neck (470 cases), trunk (745 cases), upper limbs (239 cases), and lower limbs (483 cases). From July 2006 through 2017 we detected an increase in the incidence of head and neck melanomas (19.9% vs 28.6%, p < 0.001). A drop in the incidence of melanomas located in the lower extremities was also seen in women (39.8% vs 30.4%, p < 0.001), and in men (trunks) (57.5% vs 47.3%, p = 0.003). In the multivariate analyses, only the decrease in melanomas located in lower extremities in women remained significant. CONCLUSION: The increased incidence of head and neck melanomas in both sexes and the decrease in trunk melanomas in men can be attributed to the aging of our population. The reduction in the incidence of melanomas in the lower extremities in women could be associated with changes in photoexposure patterns. Analyzing the factors possibly associated with these changes would contribute to better understanding the pathogenesis of cutaneous melanoma for prevention purposes.

Ammonium depletion associated with the COVID-19 pandemic in the Mexican Caribbean.

The Mexican Caribbean contributes significantly to Mexico's gross national product. The number of tourists declined from 16.7 million in 2019 to 8.8 million in 2020 due to the COVID-19 pandemic, with a rapid recovery of 13.5 million in 2021. Wastewater discharge is the primary contamination source associated with the tourism sector's demand for goods and services. Water quality could improve due to fewer tourists arriving during the COVID-19 sanitary emergency. This study aimed to quantify ammonium concentrations at eleven locations to evaluate water quality during the sanitary restriction due to the pandemic in the Mexican Caribbean. The ammonium concentrations were 85 % (Nov-2019), 89 % (Feb-2020), and 86 % (Feb-2021) higher than in Nov-2020, where six of the eleven sampled stations were below the detection limit (0.15 µM). Lower ammonium concentrations coincide with the sanitary restriction period and a decrease in affluent tourists.

Plasma Inflammatory Biomarkers and Anorexia of Ageing among Community-Dwelling Older Adults: An Exploratory Analysis of the MAPT Study.

Anorexia of aging and biological aging might share physiological underpinnings. The aim of this secondary analysis was to investigate the associations between circulating inflammation-related markers and anorexia of aging in community-dwelling older adults. C-reactive protein (CRP), tumor necrosis factor receptor-1 (TNFR-1), interleukin-6 (IL-6), monocyte chemoattractant protein-1 (MCP-1) and growth/differentiation factor-15 (GDF-15) were measured in plasma. Anorexia of aging was defined by the response "severe/moderate decrease in food intake" to the first item of the Mini-Nutritional Assessment. We included 463 subjects (median age=74y, IQR=71-78; 63.1% women). 33 subjects (7.1%) presented with anorexia at baseline, whereas 25 out of 363 (6.9%) developed it along 1-year follow-up. We found that TNFR1 (OR=1.74, 95%CI=1.27-2.39) and GDF-15 (OR=1.38, 95%CI=1.01-1.89) were associated with a significant increase in the odds of presenting with anorexia of aging cross-sectionally. No further significant associations were found. Biological aging mechanisms might be involved in the pathogenesis of anorexia of aging.

Dactilitis producida por sarcoidosis subcutánea como presentación de sarcoidosis / Dactylitis Due to Subcutaneous Sarcoidosis as a Manifestation of Sarcoidosis

La dactilitis o dedo en salchicha, se define como la inflamación de uno o varios dedos de las manos o de los pies. La dactilitis sarcoidea es una forma poco frecuente de dactilitis, que suele ser debida a la afectación ósea granulomatosa a nivel de las falanges subyacentes. Sin embargo, una apariencia clínica similar puede ser debida a la presencia de una sarcoidosis subcutánea en los dedos. Describimos los casos de 5 pacientes con una dactilitis por una sarcoidosis subcutánea de los dedos. En nuestros pacientes, las lesiones se localizaron en las falanges proximales a diferencia de la dactilitis sarcoidea por afectación ósea, que suele localizarse en las falanges medias y distales. Es importante el diagnóstico diferencial puesto que la dactilitis por afectación ósea suele ser mucho más persistente y asociarse a formas crónicas de sarcoidosis (AU)

Dactylitis, or sausage fingers or toes, refers to the swelling of 1 or more digits. Sarcoid dactylitis is an uncommon form that tends to be caused by granulomatous bone involvement in the underlying phalanges. Sarcoid dactylitis can, however, clinically resemble subcutaneous sarcoidosis with finger or toe involvement. We describe 5 patients with dactylitis due to subcutaneous sarcoidosis of the fingers. In all cases, the proximal phalanges were involved; sarcoid dactylitis, by contrast, tends to affect the medial and distal phalanges. Differential diagnosis is important, as dactylitis due to bone involvement tends to be much more persistent and is generally seen in chronic forms of sarcoidosis (AU)

[Translated article] Dactylitis Due to Subcutaneous Sarcoidosis as a Manifestation of Sarcoidosis / Dactilitis producida por sarcoidosis subcutánea como presentación de sarcoidosis

Dactylitis, or sausage fingers or toes, refers to the swelling of 1 or more digits. Sarcoid dactylitis is an uncommon form that tends to be caused by granulomatous bone involvement in the underlying phalanges. Sarcoid dactylitis can, however, clinically resemble subcutaneous sarcoidosis with finger or toe involvement. We describe 5 patients with dactylitis due to subcutaneous sarcoidosis of the fingers. In all cases, the proximal phalanges were involved; sarcoid dactylitis, by contrast, tends to affect the medial and distal phalanges. Differential diagnosis is important, as dactylitis due to bone involvement tends to be much more persistent and is generally seen in chronic forms of sarcoidosis (AU)

La dactilitis o dedo en salchicha, se define como la inflamación de uno o varios dedos de las manos o de los pies. La dactilitis sarcoidea es una forma poco frecuente de dactilitis, que suele ser debida a la afectación ósea granulomatosa a nivel de las falanges subyacentes. Sin embargo, una apariencia clínica similar puede ser debida a la presencia de una sarcoidosis subcutánea en los dedos. Describimos los casos de 5 pacientes con una dactilitis por una sarcoidosis subcutánea de los dedos. En nuestros pacientes, las lesiones se localizaron en las falanges proximales a diferencia de la dactilitis sarcoidea por afectación ósea, que suele localizarse en las falanges medias y distales. Es importante el diagnóstico diferencial puesto que la dactilitis por afectación ósea suele ser mucho más persistente y asociarse a formas crónicas de sarcoidosis (AU)

Dactylitis Due to Subcutaneous Sarcoidosis as a Manifestation of Sarcoidosis. / Dactilitis producida por sarcoidosis subcutánea como presentación de sarcoidosis.

Dactylitis, or sausage fingers or toes, refers to the swelling of 1 or more digits. Sarcoid dactylitis is an uncommon form that tends to be caused by granulomatous bone involvement in the underlying phalanges. Sarcoid dactylitis can, however, clinically resemble subcutaneous sarcoidosis with finger or toe involvement. We describe 5 patients with dactylitis due to subcutaneous sarcoidosis of the fingers. In all cases, the proximal phalanges were involved; sarcoid dactylitis, by contrast, tends to affect the medial and distal phalanges. Differential diagnosis is important, as dactylitis due to bone involvement tends to be much more persistent and is generally seen in chronic forms of sarcoidosis.

Circulating Levels of Apelin, GDF-15 and Sarcopenia: Lack of Association in the MAPT Study.

OBJECTIVES: Apelin and GDF-15 have been proposed as biomarkers of age-related sarcopenia but evidence in human models is scarce. This study aimed to explore the associations between blood apelin and GDF-15 with sarcopenia incidence and the evolution of sarcopenia components over two years in older adults >70 years. DESIGN: Secondary longitudinal analysis of the Multidomain Alzheimer Preventive Trial. PARTICIPANTS: Older adults (>70 years) attending primary care centers in France and Monaco. SETTING: Community. MEASUREMENTS: Serum Apelin (pg/mL) and plasma GDF-15 (pg/mL) were measured. Outcomes included sarcopenia defined by the European Working Group on Sarcopenia in Older People (EWGSOP) and its determinants (appendicular lean mass [ALM] evaluated through a Dual-energy X-ray Absorptiometry (DXA) scan, handgrip strength (HGS) and the 4-meter gait speed) measured over 2 years. Linear mixed models and logistic regression were used to explore the longitudinal associations. RESULTS: We included 168 subjects from MAPT (median age=76y, IQR=73-79; 78% women). Serum apelin was not significantly associated with sarcopenia incidence (OR=1.001;95%CI=1.000,1.001;p-value>0.05 in full-adjusted models) nor with ALM (ß=-5.8E-05;95%CI=-1.0E-04,2.12E-04;p>0.05), HGS (ß=-1.1E-04;95%CI=-5.0E-04,2.8E-04;p>0.05), and GS (ß=-5.1E-06;95%CI=-1.0E-05,2.0E-05;p>0.05) in fully adjusted models. Similarly, plasma GDF-15 was not associated with both the incidence of sarcopenia (OR=1.001,95%CI=1.000,1.002,p>0.05) and the evolution of its determinants ([ALM, ß=2.1E-05;95%CI=-2.6E-04,3.03E-04;p>0.05], HGS [ß=-5.9E-04;95%CI=-1.26E-03,8.1E-05; p>0.05] nor GS [ß=-2.6E-06;95%CI=-3.0E-05, 2.3E-05;p>0.05]) in fully adjusted models. CONCLUSIONS: Blood apelin and GDF-15 were not associated with sarcopenia incidence or with the evolution of sarcopenia components over a 2-year follow-up in community-dwelling older adults. Well-powered longitudinal studies are needed to confirm or refute our findings.

Linfoma cutáneo primario T CD8+ tipo acral inducido por hipersensibilidad retardada persistente a pendientes de oro / Primary Cutaneous Acral CD8+ T-cell Lymphoma Induced by Persistent Delayed Hypersensitivity to Gold Earrings

El linfoma cutáneo primario T CD8+ tipo acral ha sido incluido como entidad provisional dentro de la nueva clasificación revisada de las neoplasias linfoides de la Organización Mundial de la Salud en 20161. Inicialmente fue descrito como proliferación linfoide CD8+ indolente de la oreja2, y se han publicado en la literatura un total de 29 casos de dicha neoplasia. Ninguno de ellos se ha relacionado con reacciones de hipersensibilidad retardada de contacto. Presentamos un caso de linfoma cutáneo primario T CD8+ tipo acral auricular bilobular en clara relación etiológica con el uso prolongado de unos pendientes de oro confirmada con pruebas epicutáneas, estudio histológico, inmunohistoquímico y molecular. Las lesiones cutáneas bilobulares fueron inducidas de nuevo con un test de uso e idénticos resultados a los iniciales y misma clonalidad, lo cual terminó de confirmar tanto el diagnóstico del linfoma como su inducción por el estímulo antigénico del oro (AU)

Primary cutaneous CD8+ T-cell lymphoma has been included as a provisional entity within the new revised classification of lymphoid neoplasms of the World Health Organization in 20161. It was initially described as indolent CD8+ lymphoid proliferation of the ear2 and a total of 29 cases of such neoplasm have been published in the literature so far. None of them have been linked to delayed contact hypersensitivity reactions. We present a case of acral type primary cutaneous lymphoma T CD8+ involving both earlobes clearly related with the prolonged use of gold earrings, confirmed with epicutaneous tests, histopathology, immunohistochemical and molecular studies. Auricular skin lesions were induced again with a provocation test with identical histopathologycal and the same clonality, confirming both the diagnosis of lymphoma and its induction by the antigenic stimulus of gold (AU)

Primary Cutaneous Acral CD8+ T-cell Lymphoma Induced by Persistent Delayed Hypersensitivity to Gold Earrings. / Linfoma cutáneo primario T CD8+ tipo acral inducido por hipersensibilidad retardada persistente a pendientes de oro.

Primary cutaneous CD8+ T-cell lymphoma has been included as a provisional entity within the new revised classification of lymphoid neoplasms of the World Health Organization in 20161. It was initially described as indolent CD8+ lymphoid proliferation of the ear2 and a total of 29 cases of such neoplasm have been published in the literature so far. None of them have been linked to delayed contact hypersensitivity reactions. We present a case of acral type primary cutaneous lymphoma T CD8+ involving both earlobes clearly related with the prolonged use of gold earrings, confirmed with epicutaneous tests, histopathology, immunohistochemical and molecular studies. Auricular skin lesions were induced again with a provocation test with identical histopathologycal and the same clonality, confirming both the diagnosis of lymphoma and its induction by the antigenic stimulus of gold.

Análisis de la seguridad y accesibilidad de los espacios deportivos en Educación Secundaria Obligatoria / Analysis of the safety and accessibility of sports facilities in Secondary School / Análise da segurança e acessibilidade dos espaços deportivos no Ensino Secundário Obrigatório

Las instalaciones deportivas escolares son el marco idóneo donde los alumnos deben de adquirir los hábitos de actividad física, estableciendo el Real Decreto 132/2010, que estas deben de cumplir con las condiciones de seguridad y accesibilidad que determine la legislación vigente. No obstante, varias investigaciones previas alertan del incumplimiento de dichos requisitos, siendo el objetivo del presente estudio el análisis de aquellos relacionados con la seguridad y accesibilidad de los espacios deportivos utilizados para impartir las clases de Educación Física en la etapa de Educación Secundaria Obligatoria (ESO). La investigación se llevó a cabo en n=45 Institutos de ESO de titularidad pública de la Región de Murcia, a través de una observación in situ con dos listas de control ad hoc en función del espacio a analizar, de 71 ítems para espacios cubiertos y 36 ítems para espacios al aire libre, de respuesta dicotómica (SI/NO), elaboradas a partir de la normativa y legislación vigente. Los resultados muestran un porcentaje medio de cumplimiento del 63.05±7.09 en espacios cubiertos (n=51) y del 61.52±8.70 en espacios al aire libre (n=93) detectándose diferencias estadísticamente significativas en los cubiertos (p <0.05) en función de su titularidad, con un cumplimiento mayor en los municipales. Ninguno de los espacios deportivos analizados cumple con todos los requisitos establecidos, detectando numerosas deficiencias respecto a su seguridad que pueden conllevar riesgos, así como en relación a su accesibilidad, apreciando barreras arquitectónicas y un alto incumplimiento de los aspectos relacionados con la accesibilidad cognitiva y limitaciones de tipo visual

School sports facilities are the ideal framework where students must acquire physical activity habits, establishing Royal Decree 132/2010, that they must comply with the safety and accessibility conditions determined by current legislation. However, several previous studies warn of non-compliance with these requirements, being the objective of this study the analysis of those related to the safety and accessibility of the sports facilities used in Physical Education classes at the compulsory secondary education stage. This research was carried out in n=45 compulsory secondary education schools of public ownership of the Region of Murcia, through an in situ observation with two ad hoc checklists according to the space to be analyzed, of 71 items for indoor facilities and 36 items for outdoor ones, of dichotomous response (YES/NO), developed from the current regulations and legislation. The results show an average percentage of compliance of 63.05±7.09 in indoor facilities (n=51) and 61.52±8.70 in outdoor spaces (n=93) detecting statistically significant differences in the indoor ones (p <0.05) depending on their ownership, with greater compliance in the municipal. None of the sports facilities analyzed meets all the established requirements, detecting numerous deficiencies regarding their safety that may entail risks, as well as in relation to their accessibility, appreciating architectural barriers and a high breach of the aspects related to cognitive accessibility and visual limitations

As instalações esportivas escolares são a estrutura ideal onde os estudantes devem adquirir hábitos de atividade física, estabelecendo o Real Decreto 132/2010, que deve obedecer às condições de segurança e acessibilidade determinadas pela legislação vigente. No entanto, várias investigações anteriores alertam para a violação desses requisitos, sendo o objetivo do presente estudo a análise daqueles relacionados à segurança e acessibilidade dos espaços esportivos utilizados para o ensino das aulas de Educação Física no Ensino Médio obrigatório (ESO). A investigação foi realizada em n=45 institutos ESO de propriedade pública da Região de Múrcia, através de uma observação in situ com duas listas de verificação ad hoc, dependendo do espaço a ser analisado, de 71 itens para espaços cobertos e 36 itens para espaços ao ar livre, resposta dicotômica (SIM/NÃO), elaborado a partir da legislação e regulamentação vigentes. Os resultados mostram uma porcentagem média de conformidade de 63.05±7.09 nos espaços cobertos (n=51) e 61.52±8.70 nos espaços ao ar livre (n=93), sendo detectadas diferenças estatisticamente significantes (p <0.05) dependendo de sua propriedade, com maior conformidade nos municípios. Nenhuma das áreas de esportes analisadas atende a todos os requisitos estabelecidos, detectando inúmeras deficiências em relação à sua segurança que podem acarretar riscos, bem como em relação à sua acessibilidade, valorização de barreiras arquitetônicas e alta quebra de aspectos relacionados à acessibilidade cognitiva e limitações tipo visual

Clima, orientación motivacional y diversión en futbolistas alevines / Climate, Orientation and Fun in Under-12 Soccer Players

El objetivo fue analizar la influencia de las modalidades fútbol 7 (F7), fútbol 8 (F8) y fútbol 11 (F11) en categoría alevín, sobre el clima y orientación motivacional y el grado de diversión. 377 jugadores (10,91±0,76 años) completaron los cuestionarios PMCSQ-2, POSQ y CDPD. En todas las modalidades se obtuvieron valores altos para clima motivacional orientado hacia la tarea y bajos para el orientado al ego. La puntuación clima motivacional percibido orientado hacia la tarea en F11 fue menor (p < 0,05) que en F7 y F8. En la orientación hacia la tarea no hubo diferencias entre modalidades, con valores de orientación al ego en F11 superiores (p < 0,05) a F7 y F8. El grado de diversión en las tres modalidades fue alto, siendo en F11 menor (p < 0,05) que en F8, sin diferencias entre F7 y F11. Mayor participación puede aumentar la diversión y adhesión a la práctica deportiva, evitando el abandono prematuro del deporte

The objective was to analyze the influence of soccer 7 (S7), soccer 8 (s8) and soccer 11 (S11) modalities in the U12 category, on the climate and motivational orientation and the degree of fun. 377 players (10.91±0.76 years) completed the PMCSQ-2, POSQ and CDPD questionnaires. In all modalities, high values were obtained for the task-oriented motivational climate and low for the ego-oriented one. The task-oriented perceived motivational climate score in S11 was lower (p <0.05) than in S7 and S8. In task orientation there were no differences between modalities, with higher ego-oriented values in S11 (p <0.05) than in S7 and S8. The degree of fun in the three modalities was high, being lower in S11 (p <0.05) than in F8, with no differences between S7 and S11. Greater participation can increase fun and adherence to sports practice, preventing premature abandonment of the sport

¿Es determinante la modalidad de competición en la acción de regate en futbolistas sub12? / Is It Decisive the Modality of Competition U-12 in the Dribble of Soccer Players?

El objetivo fue analizar la influencia de las modalidades de juego aplicadas a la competición en categoría sub-12 sobre el regate. Se analizaron 18 partidos, 6 por modalidad, registrando 785 regates. Las variables dependientes fueron regates realizados (RT), ganados (RG) y perdidos (RP). Se registraron en función a zonas del campo: pasillos laterales (PLD+PLI) y central (PC); sector defensivo (SD), medio defensivo (SMD), medio ofensivo (SMO) y ofensivo (SO). En fútbol 11 (F11) el número de RG fue significativamente mayor (p<0,05) que en Fútbol 7 (F7). Los RT y RG realizados en PLI+PLD fueron mayores (p<0,05) en F11 que F7. Además en fútbol 8 (F8) y F11 el RT era mayor (p<0,01) en PLD+PLI que en PC, también era menor (p<0,01) en SD que en SMD y SO. La dimensión del terreno de juego es determinante en la acción técnica del regate en jugadores de categoría sub-12

The aim was to analyse the influence of the modalities of the game applied against the competition in the beginner category focusing on the dribble. We analyzed 18 matches, 6 by modality, registering 785 dribbles. The dependent variables were carried out (RT), earned (RG) and lost (RP). They were registered according to areas of the field: lateral corridors (PLD + PLI) and central (PC); defensive (SD), defensive medium (SMD), offensive medium (SMO) and offensive (SO). In Football 11 (F11) the number of RG was significantly higher (p <0.05) than in Football (F7). The RT and RG performed in PLI + PLD in F11 were significantly higher (p <0.05) than in F7. The intramodality analysis showed that in Football (F8) and F11, RT was significantly higher (p <0.01) in PLD + PLI than in PC, and there was lower (p <0.01) in SD than in SMD and SO. The size of the pitch is decisive in the technical action of dribbling in players of Us12 category

Randomized controlled trial comparing the effectiveness of the ultrasound-guided galvanic electrolysis technique (USGET) versus conventional electro-physiotherapeutic treatment on patellar tendinopathy.

BACKGROUND: Patellar tendinopathy has a high prevalence rate among athletes. Different therapeutic options can be found in the current literature, but none of them has been clearly established as the gold standard. The purpose of this study is to compare, in a randomized controlled trial, the clinical efficacy of eccentric exercise combined with either an ultrasound-guided galvanic electrolysis technique (USGET) or conventional electrophysiotherapy to treat patellar tendinopathy. METHODS: Sixty patients diagnosed with patellar tendinopathy were randomized into two groups. Group 1 (n = 30) received electrophysiotherapy treatment consisting of ultrasound, laser and interferential current techniques. Group 2 (n = 30) received USGET. Both groups did the same standardized eccentric exercise program. Periodic assessments of the subjects were carried out with the Victorian Institute of Sport Assessment-Patella (VISA-P) score. An analysis of means and a survival study were performed. RESULTS: There were statistically significant differences in the VISA-P between the baseline and final follow-up in each treatment group. Group 1 (conventional electrophysiotherapy) went from 52.5 ± 18.8 to 61.9 ± 13.7 (in VISA-P < 90 subgroup) and from 69.1 ± 9.1 to 95.2 ± 2.5 (in VISA-P > 90 subgroup). Group 2 (USGET) went from 51.4 ± 17.9 to 63.3 ± 14.3 (in VISA-P < 90 subgroup) and from 66.3 ± 13.1 to 97.1 ± 1.7 (in VISA-P > 90 subgroup). There were statistically significant correlations between the baseline and final score in the VISA-P > 90 subjects upon completing the study but no statistically significant correlations between subjects with VISA-P < 90. The mean number of sessions applied was 22.6 ± 2.5 in Group 1 and 3.2 ± 0.9 in Group 2. The success probability in Group 1 was 36.1% versus 72.4% in Group 2. The difference was statistically significant. CONCLUSION: The results obtained with the combination of USGET and eccentric exercise reported better outcomes than with the conventional electrophysiotherapy techniques in the treatment of patellar tendinopathy.

Jump Training in Youth Soccer Players: Effects of Haltere Type Handheld Loading.

The aim of this study was to compare the effects of a jump training program, with or without haltere type handheld loading, on maximal intensity exercise performance. Youth soccer players (12.1±2.2 y) were assigned to either a jump training group (JG, n=21), a jump training group plus haltere type handheld loading (LJG, n=21), or a control group following only soccer training (CG, n=21). Athletes were evaluated for maximal-intensity performance measures before and after 6 weeks of training, during an in-season training period. The CG achieved a significant change in maximal kicking velocity only (ES=0.11-0.20). Both jump training groups improved in right leg (ES=0.28-0.45) and left leg horizontal countermovement jump with arms (ES=0.32-0.47), horizontal countermovement jump with arms (ES=0.28-0.37), vertical countermovement jump with arms (ES=0.26), 20-cm drop jump reactive strength index (ES=0.20-0.37), and maximal kicking velocity (ES=0.27-0.34). Nevertheless, compared to the CG, only the LJG exhibited greater improvements in all performance tests. Therefore, haltere type handheld loading further enhances performance adaptations during jump training in youth soccer players.

Higher bone mass in prepubertal and peripubertal female footballers.

OBJECTIVES: The main aim of this study was to compare the bone mass of female football players with controls of different pubertal stages. METHODS: Sixty five girls aged 8-14 years (10.14 ± 0.1, Tanner stages I-IV) participated in the study. Twenty participants were prepubertal (10 prepubertal control) and 45 peripubertal (15 peripubertal control). All footballers trained two days per week while the control group did not perform regular physical activity outside of school. Body composition was assessed by Dual-energy X-ray absorptiometry. Analysis of covariance was performed to evaluate differences in lean and bone masses. RESULTS: Significant differences in lower-body extremities lean mass (LLM) between peripubertal groups were found (P < .05). Additionally, prepubertal footballers showed higher values of bone mineral content (BMC) at the femoral neck (P < .05) while peripubertal footballers exhibited enhanced BMC at the whole-body, trochanter and Wards triangle area. Bone mineral density (BMD) was higher in footballers compared to their non-active peers at the femoral neck and intertrochanter (P < .05, respectively) while in the peripubertal footballers higher BMD values were found in almost all of the studied body sites. CONCLUSION: Female footballers showed higher bone and lean masses compared to control counterparts; these differences are already detectable at prepubertal ages and more consistent after pubertal spurt.

Aplicación de un programa de entrenamiento de fuerza en futbolistas jóvenes / Implementation of a resistance training on young football players

El objetivo de este estudio, es comprobar el efecto de un programa de 20 sesiones de entrenamiento específico de fuerza en futbolistas jóvenes. Participaron 38 sujetos en el estudio, divididos en un grupo experimental (GE) y un grupo control (GC). Al GE se le administró un entrenamiento de fútbol y un trabajo específico de fuerza; mientras el GC sólo efectuó práctica de fútbol. Ambos fueron evaluados al inicio y al final del programa, con el objetivo de conocer su fuerza dinámica máxima en los flexores y extensores de la rodilla; su masa muscular en las extremidades inferiores; el porcentaje de grasa; y, por último, la velocidad en las pruebas de 10 y 20 metros. Únicamente el GE mejora de forma muy significativa la fuerza dinámica máxima (p<0,01). No se encuentran diferencias en la masa muscular, ni en la velocidad. El GE y el GC incrementan el porcentaje de grasa corporal (AU)

The aim of this study is to check the effect of a specific training strength program on young footballers. 38 players took place in the study; they were divided into an experimental group (EG) and a control group (CG). The EG added a specific strength work to their football workout, whereas the CG just practised football. Both of them were assessed at the beginning and at the end of the program to know their maximum dynamic strength in their flexor and extensor muscles of their knees; their muscle mass in their lower extremities; their body mass and fat percentage; and their speed in the 10 and 20 metres trials. Just the EG improves remarkably their maximum dynamic strength … No differences in their muscle mass or in their movement strength are found. The EG and the CG increase their MBRate and their body fat (AU)