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- Physical fitness spurts in childhood: a study in boysPublication . Pereira, Sara; Garbeloto, Fernando; Guimarães, Eduardo; Santos, Carla; Baxter‐Jones, Adam; Tani, Go; Freitas, Duarte; Bustamante, Alcibíades; Katzmarzyk, Peter T.; Maia, JoséThis study aimed to (1) estimate age-at-mid-growth spurt (age-at-MGS) in Portuguese boys from two different regions—the Azores islands and Viana do Castelo, and (2) identify spurts in a variety of physical fitness (PF) components aligned by age-at MGS in the two samples. A total of 176 (Azores, n = 91; Viana do Castelo, n = 85) boys aged 6 years old were followed annually to 10 years of age. Age-at-MGS and spurts in PF components (speed, explosive muscular strength, abdominal muscular strength, agility, and flexibility) were identified for each sample. The timing and intensities of the spurts were estimated using a non-smooth mathematical proce dure. In Azorean boys, age-at-MGS occurred at 7.8 years (6.99 cm y−1), whereas in Viana do Castelo it occurred at 7.9 years (6.20 cm y−1). Spurt in speed was at tained 12 months after the MGS in both samples (0.53 and 0.35 cm y−1 in Azores and Viana do Castelo, respectively), whereas spurts in explosive muscular strength and flexibility occurred 12 months before the MGS and at the MGS (Azores: 21.59 and 5.52 cm y−1 and Viana do Castelo: 14.12 and 2.5 cm y−1, respectively). Agility and abdominal muscular strength peaked between 0 and 12 months after the MGS (Viana do Castelo: 0.37 m s−1 y −1 and 6.71 reps y−1 and Azores: 0.28 m s−1 y −1 and 19.36 reps y−1, respectively). Results indicate that developmental spurts in explosive strength and flexibility occur before, or are coincident with, the mid-growth spurt in height, whereas spurts in speed, agility, and abdominal muscular strength occur after, or coincident with, the mid-growth spurt in height.
- Patterns of physical performance spurts during adolescence: a cross-cultural study of Canadian, Brazilian and Portuguese boysPublication . Guimarães, Eduardo; Baxter-Jones, Adam D. G.; Pereira, Sara; Garbeloto, Fernando; Freitas, Duarte; Janeira, Manuel A.; Tani, Go; Katzmarzyk, Peter T.; Silva, Simonete; Bailey, Donald A.; Mirwald, Robert L.; Maia, JoséBackground: Data relating physical performance to the timing of the adolescent growth spurt are lim ited. Aim: This study identifies: (i) age-at-peak height velocity (APHV), (ii) physical performance spurt patterns aligned to APHV; and (iii) cross-cultural and time patterns in Canadian, Brazilian and Portuguese boys. Subjects and methods: A total of 512 boys (131 Canadian, 250 Portuguese and 131 Brazilian), 8–17 years of age were followed serially using longitudinal data. APHV was identified and five physical performance measures velocities [trunk extension (TE), trunk flexion (TF), standing long jump (SLJ), curl-ups (CU) and handgrip strength (HG)] were aligned at 6-month intervals, 4 years around the attainment of PHV. Velocities were estimated using a non-smooth mathematical procedure. Results: APHV was 13.9 ± 1.0, 13.4 ± 1.6 and 13.0 ± 0.8 years for Canadian, Brazilian and Portuguese boys, respectively. Maximal velocity in SLJ was attained between 12 and 6 months prior to PHV. For HG, peaks were attained 12–24 months after PHV. Maximal velocity in TE occurred between 12 and 0 months prior to PHV, while CU peaked between PHV and 6 months after PHV. Conclusion: Patterns of spurts in physical performance have remained relatively the same and do not appear to be influ enced by cross-cultural differences.
- Familial resemblance in gross motor coordination. The peruvian sibling study on growth and healthPublication . Valdívia, Alcibíades B.; Henrique, Rafael S.; Pereira, Sara; Chaves, Raquel N.; Tani, Go; Freitas, Duarte; Prista, Antonio; Stodden, David F.; Katzmarzyk, Peter T.; Hedeker, Donald; Maia, JoséBackground: The development of gross motor coordination (GMC) is governed by biological and environmental factors whose effect sizes are still unclear. Aim: To investigate sibling resemblance in GMC, as well as biological and environmental correlates of GMC among Peruvian children. Materials and methods: The sample comprised 1256 biological siblings (6–15 years old), from three geographical areas of Peru. GMC was assessed using the Korperkoordinationtest fur Kinder € (KTK) test battery. Anthropometry, biological maturation and physical fitness (PF) were also measured. Multilevel modelling was performed using Stata 14 software. Results: In general, sister–sister pairs (SS) showed the highest resemblance in GMC (q ¼ 0.24) com pared to brother–sister (BS) (q ¼ 0.10) and brother–brother (BB) pairs (q ¼ 0.07). On average, BB pairs had higher GMC than SS pairs and older siblings had higher GMC than younger siblings. Further, those with lower body mass index (BMI) and higher PF had higher GMC. There was also a significant inter action between age and PF with GMC. Siblings from the rainforest region demonstrated higher GMC than those from sea level and high-altitude siblings demonstrated lower GMC than their sea level peers. Conclusion: These results demonstrate statistically significant sibling resemblance in GMC. Age, BMI, PF and geographical area were significant correlates of GMC
- Regional variation in growth status. The Peruvian health and optimist growth studyPublication . Bustamante, Alcibiades; Santos, Carla; Pereira, Sara; Freitas, Duarte; Katzmarzyk, Peter T.; Maia, JoséObjective: This study aims to (1) investigate differences in weight, body mass index (BMI), and waist circumference (WC) among Peruvian children and ado lescents living in three areas located at different altitudes; (2) compare age and sex-specific height, weight, and BMI within each site with US reference data. Methods: We sampled 8753 subjects (4130 boys), aged 4 to 17 years from sea level, rainforest, and high-altitude. Height, weight, and WC were measured and BMI was calculated. Analysis of variance was used to compare variables across geographic regions, and the Hoff and Blackburn procedure was used to compare the Peruvian results with US reference data. Results: Participants living at sea level were taller, heavier, had greater BMI and WC relative to those living at high-altitude and in the rainforest. Peruvian schoolchildren of both sexes from the three geographical areas were shorter and lighter than their American peers. Boys and girls living in the rainforest and at high-altitude had lower BMI, whereas WC values of American schoolchildren are higher than those of the Peruvian children by age and gender. Conclusions: Peruvians living at different altitudes differ in their growth indi cators (height, weight, BMI, and WC), with significant differences between those living at sea level relative to their peers from other regions. Further, Peruvian schoolchildren of both sexes from the three geographical areas signif icantly differ from their US counterparts
- Physical fitness spurts in pre-adolescent boys and girls: Timing, intensity and sequencingPublication . Pereira, Sara; Santos, Carla; Tani, Go; Freitas, Duarte; Garbeloto, Fernando; Guimarães, Eduardo; Robinson, Leah E.; Baxter-Jones, Adam; Katzmarzyk, Peter T.; Maia, JoséWe aim to (1) estimate age of attainment of the peak mid-growth spurt in stature (age-at-peak MGS) in pre-adolescent boys and girls; (2) identify the timing, intensity, and sequences of physical fitness (PF) spurts aligned by the age-at-peak MGS; and (3) identify any sex differences in PF spurts aligned by age-at peak MGS. The sample included 180 Portuguese children (90 girls) aged 6 to 10 years at study entry who were followed annually for 4 years. Height, health-, and performance-related PF were assessed. Age-at peak MGS and PF spurts were estimated using a non-smooth mathematical procedure. Boys’ and girls’ age-at-peak MGS occurred at 7.8 ± 0.47 years and 8.0 ± 0.72 years, respectively. PF spurts’ timing aligned by age-at-peak MGS were as follows: (1) before age-at-peak MGS: boys – static strength, aerobic capacity, explosive leg strength, and flexibility; girls – speed, agility, aerobic capacity, and upper body strength; (2) coincident with age-at-peak MGS: girls – explosive leg strength and flexibility; (3) after age-at-peak MGS: boys – abdominal strength, upper body strength, agility, and speed; girls – abdominal strength and static strength. Boys and girls attained their MGS at relatively similar ages. However, the timing and sequences of PF spurts, aligned on age-at-MGS, were different between boys and girls.
- Are there gross motor coordination spurts during mid‐childhood?Publication . Santos, Marcos A. M. dos; Baxter‐Jones, Adam; Reyes, Ana C.; Freitas, Duarte; Henrique, Rafael S.; Chaves, Raquel N.; Bustamante, Alcibíades; Tani, Go; Katzmarzyk, Peter T.; Maia, JoséObjectives: The aims of this study were (1) to identify the timing of the mid growth spurt (MGS) in stature in children and (2) to identify gross motor coordina tion (GMC) spurts when aligned by the age of attainment of the MGS (aMGS). Methods: Stature, weight, and GMC were measured in 245 Portuguese children followed annually from 6 to 10 years. GMC was assessed and to estimate children's MGS in stature as well as GMC spurts in each of the four tests aligned by aMGS, we used a nonsmoothed polynomial methodology. Results: In boys, the aMGS was attained at 7.8 years, whereas in girls it was 8.0 years. In boys, the peak MGS was 6.2 cm yr−1 and in girls it was 6.4 cm yr−1 . In boys, the peak for walking backwards (WB) occurred 18 months before aMGS (14.9-points yr−1 ), jumping sideways (JS) was 12 months after aMGS (13.5-points yr−1 ), hopping on one leg (HO) was 18 months before aMGS (11.7-points yr−1 ), and shifting platform (SP) was 12 months before aMGS (6.8-points yr−1 ). In girls, WB spurts occurred 12 months after aMGS (13.3-points yr−1 ), JS was 12 months before aMGS (10.5-points yr−1 ), HO was coincident with aMGS (10.4-points yr−1 ), and SP was 18 as well as 12 months before aMGS (7.2-points yr−1 ). No differences were observed in the mean peak spurts between sexes in the GMC tests. Conclusions: Boys and girls reached their MGS in stature at about the same chro nological age. Spurts in GMC did not express themselves in the same biological timing relative to aMGS in stature, and there are sex differences.