Independência temporal das respostas do esforço percebido e da freqüência cardíaca em relação à velocidade de corrida na simulação de uma prova de 10km

Abstract

The objective of this study was to investigate pacing strategy, perceived exertion and heart rate during a competitive run simulation. Eight recreational runners ran a 10 km distance in an outdoor 400 m track with 28-30 o C temperature. Before the run they were asked to run the 10 km as faster as possible. The run velocity, the perceived exertion and the heart rate were measured each 400 m. The speed of run decreased on 19 th and 20 th laps (p < 0.05). The heart rate increased significantly on 7 th and 10 th laps (p < 0.05) and achieved steady state afterwards, while the perceived exertion increased statistically until the 13 th lap (p < 0.05). These data suggest that pacing strategy, perceived exertion and heart rate have different temporal adjustments during a competitive run. Possibly the run strategy is established before the competition simulation and has an economic aspect to the last lap. This economic effect of run strategy is determined until the half of the distance is completed by rate of perceived exertion modulation, which is a result of metabolic, context and cognitive feedbacks.

Comparação entre desempenhos de corrida time trial realizados em pista e esteira

“…Additionally, values of HR med (bpm) and HR max (bpm) were statistically different between the two trial types (P = 0.016 and 0.030, respectively). There was no difference in RPE final (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) between the two types of test (P > 0.05).…”

“…In other words, one in which the start of the time trial is run at high velocity, followed by a progressive decrease during the run, followed by an increase in velocity towards the end. This strategy has been observed in studies analyzing pacing strategy in recreational runners and also among competitors in top-level 10 km races 13,21 . It therefore appears that factors related to the environment in which trials are conducted may affect the choice of pacing strategy adopted in performance tests.…”

“…Studies that have analyzed pacing strategy and the behavior of physiological variables during endurance running have found that the best strategy that would make best performance possible is not established [11][12][13] . Additionally, factors such as the capacity of energy systems, the runner's experience, duration of the trial and environmental conditions all have an effect on the choice of pacing strategy 12,14 .…”

“…It was also observed that over the course of the time trials RPE increased significantly irrespective of test environment and HR increased significantly during treadmill trials. The few studies that have analyzed these variables during endurance runs have also found significant increases between the start and end of the test 11,13 . Finally, certain limitations of this study should be borne in mind, including the failure to randomize the order of trials, the constant visual feedback of velocity and elapsed time only available during treadmill trials; the fact that wind speed was not measured during track tests; the minor differences in temperature and humidity between test environments; and the differences in warm-up protocols before the two types of trial.…”

Risco de fadiga prematura, percepção subjetiva de esforço e estratégia de prova durante uma corrida de 10 km

“…Um novo aumento da velocidade foi observado no último quilômetro, caracterizando o "sprint"-nal. De fato, as estratégias de padrão variável com início rápido têm sido utilizadas por muitos corredores em provas de médias e longas distâncias 4,25 . T et al 4 observaram esse tipo de estratégia em 33 dos 34 recordistas mundiais dos 10 km.…”