A influência de variáveis aeróbias e anaeróbias no teste de “sprints” repetidos

Abstract

Intermittent sports are very popular and practiced by many people around the world. Such sports (e.g., soccer, rugby, tennis and others) require repeated sprint actions, that is, maximum or near-maximum e orts interspaced by short recovery times (< 60 seconds) [1][2][3][4][5] . Indeed, albeit the frequency/incidence of these actions are low 1, 5-7 , these brief periods are normally the decisive moments of the game. For better performance in the repeated sprints (RS), it is necessary that the subject covers a certain distance as fast as possible (i.e., within the shortest time) at the rst sprint and, then, be able to repeat a similar performance in a subsequent one 8 . However, the sprint total time increases throughout the RS, which determines the fatigue related with this activity. According to the above-cited evidences, some studies point out that RS involves the transfer of energy by the three energetic systems as well as periods of restitution and clearance of the substrates that in uences the energy production [8][9] . us, this activity is dependent on the dynamic integration among the physiological systems (e.g., cardiovascular, respiratory and neuromuscular). AbstractThis study aimed to determine the manner and degree to which aerobic and anaerobic variables infl uence repeated running sprint performance and ability. Twenty four males (sprinters = 8, endurance runners = 8 and physical active subjects = 8) performed in a synthetic track the following tests: 1) incremental test to determine the VO 2 max and the maximum aerobic velocity (MAV); 2) constant velocity test performed at 110% of MAV to determine the VO 2 kinetics and the maximum accumulated oxygen defi cit (MAOD); 3) repeated sprint test (10 sprints of 35-m interspersed by 20s) to determine sprint total time (TT), best sprint time (BT) and score decrement (Sdec). Between-groups comparisons and the correlations between variables were analyzed by one-way ANOVA with a Tukey post-hoc tests and Pearson correlation, respectively. TT was signifi cantly different among all groups (sprinters = 49.5 ± 0.8 s; endurance = 52.6 ± 3.1 s; active = 55.5 ± 2.6 s) and Sdec was signifi cantly lower in endurance runners as compared with sprinters and physical active subjects (sprinters = 8.9 ± 2.1%; endurance = 4.0 ± 2.0%; active = 8.4 ± 4.4%). TT correlated signifi cantly with BT (r = 0.85, p < 0.01) and MAOD (r = -0.54, p < 0.01). Moreover, Sdec was signifi cantly correlated with aerobic parameters (VO 2 max, r = -0.58, p < 0.01; MAV, r = -0.59, p < 0.01; time constant tau, r = 0.45, p = 0.03). In conclusion, although the aerobic parameters have an important contribution to RS ability, RS performance is mainly infl uenced by anaerobic parameters.

Variability of Lower Limb Artery Systolic–Diastolic Velocities in Futsal Athletes and Non-Athletes: Evaluation by Arterial Doppler Ultrasound

“…During the aerobic and anaerobic physical activity, it is essential to increase muscle oxygen consumption, and this increase depends on the blood flow increase to the musculature and consequent increase in oxygen uptake in muscles [7]. Increased blood flow occurs due to increased cardiac output and flow redistribution towards musculature [2,[7][8][9]. Increased capacity to extract oxygen depends on the musculature vascular network and oxidative capacity [2,[7][8][9].…”

“…Increased blood flow occurs due to increased cardiac output and flow redistribution towards musculature [2,[7][8][9]. Increased capacity to extract oxygen depends on the musculature vascular network and oxidative capacity [2,[7][8][9]. In turn, increased cardiac output during dynamic exercise is mainly due to increases in heart rate, but also to an increase in systolic volume at an early stage.…”