Browsing by Author "Rezende, Leonardo M.T."
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- Equations based on anthropometric measurements for adipose tissue, body fat, or body density prediction in children and adolescents: a scoping reviewPublication . Cerqueira, Matheus S.; Amorim, Paulo Roberto dos Santos ; Encarnação, Irismar Gonçalves; Rezende, Leonardo M.T.; Almeida, Paulo H.R.F.; Silva, Analiza M.; Sillero-Quintana, Manuel; Silva, Diego A.S.; Santos, Fernanda K.; Marins, João C.B.Assessing the body composition of children and adolescents is important to monitor their health status. Anthropometric measurements are feasible and less-expensive than other techniques for body composition assessment. This study aimed to systematically map anthropometric equations to predict adipose tissue, body fat, or density in children and adolescents, and to analyze methodological aspects of the development of anthropometric equations using skinfolds. Methods: A scoping review was carried out following the PRISMA-ScR criteria. The search was carried out in eight databases. The methodological structure protocol of this scoping review was retrospectively registered in the Open Science Framework (https://osf.io/35uhc/). Results: We included 78 reports and 593 anthropometric equations. The samples consisted of healthy individuals, people with different diseases or disabilities, and athletes from different sports. Dual-energy X-ray absorptiometry (DXA) was the reference method most commonly used in developing equations. Triceps and subscapular skinfolds were the anthropometric measurements most frequently used as predictors in the equations. Age, stage of sexual maturation, and peak height velocity were used as complementary variables in the equations. Conclusion: Our scoping review identified equations proposed for children and adolescents with a great diversity of characteristics. In many of the reports, important methodological aspects were not addressed, a factor that may be associated with equation bias. Level IV: Evidence obtained from multiple time series analysis such as case studies. (NB: dramatic results in uncontrolled trials might also be regarded as this type of evidence).
- Thermal stress and physiological responses in Brazilian jiu-jitsu athletes submitted to simulated fights in a hot environmentPublication . Pereira, Diogo; Forte, Pedro; Leite, Luciano Bernardes; Ribeiro, Joana; Cachada, José M.; Bolani, Wladimir; Pussieldi, Guilherme de Azambuja; Rezende, Leonardo M.T.; Pimenta, Eduardo Mendonça; Cabido, Christian Emmanuel Torres; Oliveira Junior, Mario Norberto Sevilio; Mendes, Thiago Teixeira; Veneroso, Christiano EduardoAnalyze thermal stress and changes in physiological variables in simulated BJJ fights in a hot environment. The study included 12 male athletes, comprising 11 black belts and 1 brown belt. The athletes were divided into pairs according to their categories and there were four 10-minute bouts with 10 minutes of rest between bouts in a covered environment, during the night, with an ambient temperature (TA) of 29.3 ± 0.5ºC and relative air humidity (URA) of 75.9 ± 1.1%. The variables heart rate (HR), lactate, gastrointestinal temperature (Tgi) and skin temperature (Tskin), hand grip, dehydration rate, total sweating and specific urine density were evaluated. HR, lactate and Tgi data were collected before starting the simulated fights (pre 1, 2, 3 and 4), immediately after the end of each fight (post 1, 2, 3, and 4). All other variables were collected during the baseline period, which corresponds to pre 1, and in the post-fight assessments (post-fight 1, 2, 3, and 4). There was a significant reduction in body mass post-fight compared to pre-simulated fights (p < 0.001). Despite ad libitum hydration, athletes transitioned from a euhydrated state to significant-to-severe dehydration by the end of the protocol. HR values were significantly higher post-fight (post 1, 2, 3, 4) compared to rest (pre-1) (p < 0.001). Blood lactate levels increased post-fight (post 1, 2, 3, 4) compared to rest (pre-1). Tgi increased significantly after the first fight (post 1, 2, 3, 4) compared to rest (pre 1) (p < 0.001) and remained stable until the fourth fight. Tskin showed a increase post-fight (post 1, 2, 3) compared to rest (pre-1) (p < 0.001). Conclusions: The thermoregulatory mechanisms were sufficient to maintain thermal control during the simulated BJJ fights.