Aptidão aeróbia e amplitude dos domínios de intensidade de exercício no ciclismo

Abstract

Introduction: The determination of the exercise intensity domains has important implications for the aerobic training prescription and elaboration of experimental designs. Objective: The aim of this study was to analyze the effects of aerobic fitness level on the amplitude of the exercise intensity domains during cycling. Methods: Twelve cyclists (CYC), eleven runners (RUN) and eight untrained subjects (NT) underwent the following protocols on different days: 1) progressive test to determine lactate threshold (LT), maximal oxygen uptake (VO 2max ) and its corresponding intensity (IVO 2max); 2) three constant workload tests until exhaustion at 95, 100 and 110% IVO 2max to determine critical power (CP); 3) constant workload tests until exhaustion to determine the highest intensity at which VO 2max is reached (I sup ). Results: The amplitude of the moderate domain was similar between CYC (52 ± 8%) and RUN (47 ± 4%) and significantly greater in CYC when compared with NT (41 ± 7%). The heavy domain was significantly smaller in CYC (17 ± 6%) when compared with RUN (27 ± 6%) and NT (27 ± 9%). In relation to severe domain, there were no significant differences among CYC (31 ± 7%), RUN (26 ± 5%) and NT (31 ± 7%). Conclusion: It can be concluded that the heavy domain is more sensitive to changes determined by the aerobic fitness level; there is a need hence to observe the training specificity, when high level of physiological adaptation is aimed..

A maior velocidade e o menor tempo de exercício em que o VO2max é alcançado na corrida

“…This suggestion is in accordance with the study of Billat et al 10 in which only subjects possessing higher D' values achieved VO 2 max at 140% vVO 2 max. However, it should be noted that vVO 2 max was the main variable in multiple regression analysis, a finding corroborated by studies in which this threshold responded positively to aerobic training 6,12 . In contrast to V HIGH , T LOW was similar in the runners and active subjects studied here.…”

“…Intensities just above critical power (i.e., 5 to 10%) permit VO 2 max to be reached 4,5 , thereby entering the severe domain which is characterized by all exercise intensities at which VO 2 max is achieved. Finally, the extreme domain comprises even higher intensities when the individual reaches the point of exhaustion even before achieving VO 2 max 1,2,6 . Since the severe domain is the only intensity domain in which VO 2 max is achieved during constant-load exercise, it represents an important physiological range for the prescription of high-intensity interval training 7 , which is necessary to provoke additional adaptations in aerobic parameters of trained athletes 8 .…”

Sleep quality and duration are associated with performance in maximal incremental test

“…The initial workload was defined according to the reported fitness condition assessed via IPAQ and subsequently confirmed by maximal oxygen uptake, as follows: 35 W for the untrained subjects, 70 W for physically active subjects, and 105 W for the well-trained subjects. In all cases, a 25 W increment at each stage, and cycling frequency between 70 and 90 rpm was used [17,18]. The oxygen uptake (VO 2 ) was assessed by a breath-by-breath respiratory gas analyzer (Quark PFT, Cosmed®, Rome, Italy).…”