Padilla PJ, Santos CVA, Pérez TCE

Language: Spanish
References: 0
Page: 194-201
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ABSTRACT

The kinetics study of the heart rate (HR) response triggered by an ergometric function, allow us to study the degree of endurance sportive condition. We investigated if there exist HR kinetic differences between athletes, and non athletes holding certain degree of sportive endurance condition in terms of pulmonary maximal O₂ uptake (VO₂). We studied 38 volunteers, divided in two non athletes groups of control: NOA_thletes Y_oungs (n = 9, 20 ± 3 years) (mean ± SD) y NOA_thletes A_dults n = 9, 39 ± 8 years ); and two sportive groups: A_thletes Y_oungs (n = 10, 19 ± 2 years) y A_thleesA_dults (n = 10, 40 ± 9 years). Volunteers performed a maximal effort test pedaling sited on an electronic cycle ergometer, an open spirometric circuit method to measure the transient cardiopulmonary response (FC; VO₂; VCO₂, pulmonary CO₂ output; Ve, expired ventilation) and the ergometric power (POT_max). We modeled by computer the phase of the transient phases two of three HR, using the mean square linear regression method on the experimental data from a ramp test and the mean response time (MRT, s) was analyzed to study HR kinetic response (beats•min^-1). Resting HR resulted lower (59 ± 7 ‹ 73 ± 13) and POT_max, was higher (234 ± 27 ‹ 197 ± 29, W) in A_thletesY_oungs compared NOA_thletes Y_oungs while the VO_2max either absolute (3.1 ± 0.8 ‹ 2.3 ± 0.5, l•min^-1) or relative to the total body mass (48 ± 13 › 31 ± 5, mL•min^-1 •kg^-1, and the MRT of the HR (77 ± 9 › 57 ± 13) were higher in A_thletesAdults compared NOA_thletesA_dults. The HR response, similar between the young groups is explained mainly by the effect of the age rather to the impact of the exercise. The differences of HR between the groups of adults are explained by the benefical effect of the regular sport activity on the cardiovascular system and skeletal muscle system in athletes, and these cause a better homoeostatic cardiovascular response to the ergometric exercise. We concluded that a slow phase two on transient HR kinetics to ramp test estimated the endurance sportive condition in adult athletes.