José Antonio Serrano-Sanchez

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OBJECTIVE To study the effect of physical activity on whole body fat (BF), its regional deposition and the influence of body fatness on physical performance in prepubertal children. DESIGN Cross-sectional study. SUBJECTS A total of 114 boys (9.4+/-1.5 y, Tanner I-II), randomly sampled from the population of Gran Canaria (Spain), 63 of them physically(More)
PURPOSE To determine the effect of physical activity on bone mineral accrual during growth in prepuberal boys. METHODS Seventeen soccer players and 11 matched (physically active) control boys (Tanner 1-2, at the start of the study) were followed over a 3-yr period. Bone mineral content (BMC) and a real density (BMD) was measured by dual-energy x-ray(More)
Not much is known about the osteogenic effects of sport activities before puberty. We tested the hypothesis that football (soccer) participation is associated with enhanced bone mineral content (BMC) and areal density (BMD) in prepubertal boys. One hundred four healthy white boys (9.3 +/- 0.2 years, Tanner stages I-II) participated in this study: 53(More)
BACKGROUND Excessive time in front of a single or several screens could explain a displacement of physical activity. The present study aimed at determining whether screen-time is associated with a reduced level of moderate to vigorous physical activity (MVPA) in Spanish adolescents living in favorable environmental conditions. METHODOLOGY/PRINCIPAL(More)
To assess if exercise before puberty affects bone mineral content (BMC) and bone mineral density (BMD) we determined BMC and BMD in the dominant arm (DA) and non-dominant arm (NDA), lumbar spine and femoral neck in 25 tennis players (TP), 21 soccer players (SP) and 22 physically active controls (CG). All of them were under 12 years of age and prepubertal.(More)
OBJECTIVE To analyse the effect of extracurricular physical activities on fat mass accumulation and physical fitness during growth in early pubertal males. DESIGN Longitudinal study. SUBJECTS A total of 42 male children (9.4+/-1.4 years, Tanner I-II and 12.7+/-1.5 years, Tanner III-IV, before and after the 3.3 years follow-up, respectively), randomly(More)
Professional tennis players (TP) have marked inter-arm asymmetry in bone mass (BMC) and density (BMD). To determine if this asymmetry is influenced by training frequency and volume, we studied 24 young tennis players (mean age 10.6 years, Tanner 1–2), 17 physically active control boys (CG) and ten male professional tennis players. Young TP were divided into(More)
Leptin and osteocalcin play a role in the regulation of the fat-bone axis and may be altered by exercise. To determine whether osteocalcin reduces fat mass in humans fed ad libitum and if there is a sex dimorphism in the serum osteocalcin and leptin responses to strength training, we studied 43 male (age 23.9 2.4 yr, mean +/- SD) and 23 female physical(More)
BACKGROUND To determine if there is an association between physical activity assessed by the short version of the International Physical Activity Questionnaire (IPAQ) and cardiorespiratory and muscular fitness. METHODOLOGY/PRINCIPAL FINDINGS One hundred and eighty-two young males (age range: 20-55 years) completed the short form of the IPAQ to assess(More)
Osteocalcin is a hormone produced by osteoblasts which acts as a negative regulator of fat mass, protecting against diet induced obesity and insulin resistance in rodents. To determine if an acute increase in osteocalcin concentration is associated with opposed changes in circulating leptin levels and insulin resistance we studied 15 middle and long(More)