Revista Brasileira de Medicina do Esporte
Print version ISSN 1517-8692
MIRANDA, Humberto et al. Analysis on the cardiac rate, blood pressure and doubled-product in different body positions in resisted exercises. Rev Bras Med Esporte [online]. 2005, vol.11, n.5, pp. 295-298. ISSN 1517-8692. http://dx.doi.org/10.1590/S1517-86922005000500010.
Presently, resisted exercises (RE) have suffered several investigations due to the importance they attained to the development of the cardiorespiratory and neuromuscular fitness. To prescribe the RE, some variables such as cardiac rate (CR), and blood pressure (BP) shall be monitored. The association between the CR and BP supply data to allow the obtainment of the doubled-product (DP). These two variables were used to analyze and compare the hemodynamic responses of the straight seat supine (SRS) and straight slying supine (SRD) and ten repetitions at 65% of a maximum repetition (1 RM) were performed. The sampling was composed by 14 individuals (10 female and 4 male) with mean ages of 23 years (± 4 years), body weight of 61 kg (± 7 kg), and height of 168 cm (± 5 cm). As material to the collection, it was used a Polar MZ1 frequencymeter (Finland), a Vasquez-Lubry sphygmomanometer (Germany), and a Littman stethoscope (USA). It was used the coupled t-Student test to make a comparison between values found among physiological variables. The statistical analysis had as significance criterion p < .05. Every variable presented a mean higher value in the SRS related to the SRD. It was considered the pre- and post-exercise's CR, the BP, SBP and DBP. It is understood that the absolute value of the BP measured by the auscultatory method trends to be lower than the value recorded inside the artery, but in test situations using different intensity exercises, the percentage of the BP variation presents the same trend than the invasive method. Thus, it can be concluded that the SRS and SRD exercises did not present significant differences in none of the physiological parameters studied, but it was noted a small decreased response of that parameter in the SRD exercise. So, it is necessary to accomplish further studies analyzing different body positions to establish a conduct as to these exercises through comparisons.
Keywords : Hemo-dynamic responses; Body position; Strength training.