Kons, RL, Ache-Dias, J, Detanico, D, Barth, J, and Dal Pupo, J. Is vertical jump height an indicator of athletes' power output in different sports modalities? J Strength Cond Res 32(3): 708-715, 2018-This study aimed to identify whether the ratio standard is adequate for the scaling of peak power output (PPO) for body mass (BM) in athletes of different sports and to verify classification agreement for athletes involved in different sports using PPO scaled for BM and jump height (JH). One hundred and twenty-four male athletes divided into 3 different groups-combat sports, team sports, and runners-participated in this study. Participants performed the countermovement jump on a force plate. Peak power output and JH were calculated from the vertical ground reaction force. We found different allometric exponents for each modality, allowing the use of the ratio standard for team sports. For combat sports and runners, the ratio standard was not considered adequate, and therefore, a specific allometric exponent for these 2 groups was found. Significant correlations between adjusted PPO for BM (PPOADJ) and JH were found for all modalities, but it was higher for runners (r = 0.81) than team and combat sports (r = 0.63 and 0.65, respectively). Moderate agreement generated by the PPOADJ and JH was verified in team sports (k = 0.47) and running (k = 0.55) and fair agreement in combat sports (k = 0.29). We conclude that the ratio standard seems to be suitable only for team sports; for runners and combat sports, an allometric model seems adequate. The use of JH as an indicator of power output may be considered reasonable only for runners.

Introdução e objetivos: O objetivo deste estudo foi mensurar os efeitos do ritmo ventilatório na regulação do tônus simpático, avaliada a partir de variáveis referentes à variabilidade da frequência cardíaca (VFC). Métodos: Foram envolvidos no estudo 15 voluntários fisicamente ativos, estudantes de Educação Física, os quais realizaram três intervenções, organizadas de maneira aleatória, com frequência ventilatória (FV) a 6, 15 e 24 ciclos por minuto (cpm). Registraram-se as medidas de VFC e da frequência cardíaca antes, durante e após a intervenção com diferentes FV. A análise dos dados contou com estatística descritiva e ANOVA de dois caminhos com medidas repetidas. Resultados: Encontraram-se diferenças significativas na frequência cardíaca média à medida que os ciclos ventilatórios aumentaram, indo de 66,20 ± 6,77 bpm em 6 cpm à 83,20 ± 10,90 bpm em 24 com (p < 0,001). A média dos intervalos R-R diminuiu quando o número de ciclos ventilatórios aumentou (relação inversão), com diferença significativa durante a fase de intervenção quando comparado o valor em frequência ventilatório baixa e normal com o valor encontrado em frequência ventilatória elevada (respectivamente 914,35 ± 102,69 ms; 882,35 ± 151,01 ms e 731,88 ± 97,66 ms; p < 0,001). Índices no domínio do tempo (pNN50 e rMSSD) também sofreram decréscimo à medida que os ciclos ventilatórios aumentaram (p < 0,001). Em banda de alta frequência (AF) e baixa frequência (BF) foram encontradas diferenças estatísticas relacionadas ao ritmo e ao momento, porém não foram encontradas alterações em banda de muito baixa frequência (MBF). Registraram-se alterações na potência total (P.T) e na razão entre as bandas de frequência (BF/AF) tanto ao se considerar ritmo, quanto momento. Conclusões: Alterações na FV afetam significativamente a média da frequência cardíaca, e altera índices da VFC, tanto do domínio do tempo, quanto do domínio da frequência. Effects of ventilatory rate on indices of heart rate variability ABSTRACT Introduction and objetives: The aim of this study was to measure the effects of ventilation rate in the regulation of sympathetic tone, assessed from variables related to heart rate variability (HRV). Methods: 15 physically active volunteers who were physical education students were enrolled in the study and underwent three interventions, arranged randomly, with ventilatory frequency (VF) of 6, 15 and 24 cycles per minute (cpm). The measures of HRV and heart rate were recorded before, during and after intervention with different VF. Data analysis included descriptive statistics and ANOVA two-way. Results: Significant differences were found in average heart rate as the ventilation cycles increased, varying from 66.20 ± 6.77 bpm at 6 cpm to 83.20 ± 10.90 bpm at 24cpm (p < 0.001). The mean R-R interval decreased when the number of ventilation cycles increased (ratio inversion), with a significant difference during the intervention phase when comparing the value at low and normal

Objetivou-se avaliar o perfil de militares da ativa do Núcleo de Preparação dos Oficiais da Reserva de Pelotas/RS. Foram envolvidos 30 militares que cumpriam treinamento físico diário. Mensurou-se potência de membros inferiores, velocidade, resistência de força, potência aeróbia (VO2max), variabilidade da frequência cardíaca (VFC) e concentração de creatina quinase ([CK]). Empregou-se estatística descritiva e as correlações foram testadas com teste de Pearson. Os envolvidos apresentaram 66,9±7,2 kg, a [CK] de repouso foi de 390,7±317,9 U•L-1 e VO2max de 48,85±5,99 mL•kg-1•min-1. Conclui-se que a aptidão física dos militares envolvidos é intermediária. A concentração de CK está próxima ao limite superior de referência e os valores da VFC indicam funcionamento autonômico adequado.

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American football is a high-impact collision sport, which may lead to high injury rates in the players. thus, knowing the aetiology and incidence of injuries may be useful not only for the treatment, but especially to help sports professionals to develop strategies or mechanisms of prevention while aiming to maintain the physical integrity of the athletes. Purpose. the aim of the study was to verify the prevalence of injury among American football players from the Santa Catarina state of Brazil. Methods. the total of 140 athletes were evaluated in the study with the use of an online questionnaire. Descriptive logistic regression and t-test analysis were applied (p < 0.05). Results. A high injury prevalence (74%) in the evaluated athletes was observed. Most of these injuries occurred during training (56%) and by direct contact between players (64%). Shoulders, knees, and hand/fingers were the most commonly injured body parts (14%, 13%, 12%, respectively). the most frequent types of injuries were those related to joints (46%) and muscles (39%), and very few concussions were reported. We found a significant positive association showing that the athletes that performed a conditioning program presented higher injury prevalence (p = 0.01). Conclusions. American football players of the Santa Catarina state are affected by high injury prevalence. the training characteristics, in general, do not seem to be associated with injury prevalence. thus, aiming to reduce the exposure to injuries, we recommend for coaches and trainers to monitor the total volume of training and participation in matches.