This study compared heart rate (HR), oxygen uptake (VO2), percentage of maximal HR (%HRmax), percentage of maximal VO2, and cadence (Cad) related to the anaerobic threshold (AT) during a water cycling maximal test between heart rate deflection point (HRDP) and ventilatory (VT) methods. In addition, the correlations between both methods were assessed for all variables. The test was performed by 27 men in a cycle ergometer in an aquatic environment. The protocol started at a Cad of 100 b · min(-1) for 3 minutes with subsequent increments of 15 b · min(-1) every 2 minutes until exhaustion. A paired two-tailed Student's t-test was used to compare the variables between the HRDP and VT methods. The Pearson product-moment correlation test was used to correlate the same variables determined by the 2 methods. There was no difference in HR (166 ± 13 vs. 166 ± 13 b · min(-1)), VO2 (38.56 ± 6.26 vs. 39.18 ± 6.13 ml · kg(-1) · min(-1)), %HRmax (89.24 ± 3.84 vs. 89.52 ± 4.29%), VO2max (70.44 ± 7.99 vs. 71.64 ± 8.32%), and Cad (174 ± 14 b · min(-1) vs. 171 ± 8 b · min(-1)) related to AT between the HRDP and VT methods. Moreover, significant relationships were found between the methods to determine the AT for all variables analyzed (r = 0.57-0.97). The estimation of the HRDP may be a noninvasive and easy method to determine the AT, which could be used to adapt individualized training intensities to practitioners during water cycling classes.

No abstract

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.

Purpose: The present study aimed to investigate whether training status would influence the capacity of a verification phase (VER) to confirm maximal oxygen uptake (VO2max) of a previous graded exercise test (GXT) in individuals with hypertension. Methods: Twelve older adults with hypertension (8 women) were recruited. Using a within-subject design, participants performed a treadmill GXT to exhaustion followed by a multistage VER both before and after a 12-wk pragmatic combined exercise training program. Individual VO2max, respiratory exchange ratio (RER), maximal heart rate (HRmax), and rating of perceived exertion (RPE) were measured during both GXT and VER tests. Mean values were compared between bouts using paired sample t-tests, and VO2max was also compared between GXT and VER individually. Results: Testing was well tolerated by all participants. Absolute and relative VO2max values were higher in VER than in GXT at baseline, but only absolute VO2max differed between bouts post-intervention (all p<0.05).Individual VO2max comparisons revealed that 75% of the participants (9/12) achieved a VO2max value that was ≥3% during VER both before (range: from +4.9% to +21%) and after the intervention (range: from +3.4% to +18.8%), whereas 91.7% (11/12) of the tests would have been validated as a maximal effort if the classic criteria were employed (i.e., VO2 plateau or at least two secondary criteria). Conclusion: A 12-wk combined training intervention could not improve the capacity of older adults with hypertension to achieve VO2max during a GXT, as assessed by VER.