Dissertação
Análise discreta e funcional da assimetria bilateral de produção de torque de ciclistas amadores em diferentes intensidades e momentos de exercício
Fecha
2020-02-21Registro en:
0000-0003-1520-7330
Autor
Jéssica da Silva Soares
Institución
Resumen
In cycling, applying torque to the pedals, positioning the rider on the bike, and
peak power appear to directly affect performance. Cyclists use different strategies to
maintain performance, such as decreased pedaling cadence, modification of muscle
activation and torque production asymmetry. It is also important to consider that
cyclists are subjected to submaximal intensities for long periods and during these
lower intensities higher levels of torque production asymmetry are expected. In
addition, the fatigue process that occurs during exercise can cause changes in the
level of bilateral asymmetry. Therefore, the objective of the present study was to
verify the effect of different workloads and moments (beginning and end) of exercise
on the asymmetry behavior through two analyzes, a discrete analysis from the peak
torque and a functional analysis, considering all pedaling cycle. The sample of this
study consisted of amateur cyclists who underwent a test to determine the maximum
pedaling power and three tests with power (60, 80 and 95% powerMAX) and fixed
cadence until exhaustion with 48h interval between each session. To verify the
behavior of bilateral asymmetry between workloads through peak torque, a two-way
repeated measures ANOVA was used, and the analyzed factors were workloads (60,
80 and 95% powerMAX) limbs (right and left). To verify the behavior of bilateral
asymmetry between different exercise moments, a two-way ANOVA was also
performed with the factors moments (beginning and end) and limbs (right and left).
To determine asymmetries in time series, a two-way functional variance analysis
(FANOVA) for repeated measures was applied, considering the same factors
included in the ANOVA approaches. In all analyzes, a significance level of 5% was
adopted. The discrete analysis showed no differences between the members
regardless of the exercise intensity analyzed, however, the functional analysis
showed some differences between the members within the cycle between the right
and left members, information that the discrete analysis disregards since it only uses
the peak torque variable. Regarding the timing of the exercise, there were no
significant differences between the members regardless of the method of analysis
used or the exercise intensity. The results of the present study confirmed the
hypothesis that FANOVA would be more sensitive in detecting asymmetry in the
torque production profile in amateur cyclists compared to ANOVA. However, the
hypotheses that the increase in intensity and the moment of exercise influenced the
asymmetry behavior were not confirmed.