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- The effects of aging on electromechanical delay: a comparison between karate athletes and non-athletesPublication . Brito, António Vences; Rodrigues Ferreira, Mário André; Branco, Marco A. C.Normal aging in humans is associated with a progressive decline in biological functions that affect motor performance. This study intended to analyze the effects of aging on electromechanical delay during the mae-geri kick performance. Forty-six males were divided into three groups according to age and sports practice: 9 veteran karate practitioners aged between 50 and 63 years (VetK), 21 young karate practitioners (YgK) and 16 non-karate practitioners aged between 18 and 35 years old. Electromechanical delay was defined as the time interval between the onset of the electric activity of a muscle and the beginning of joint movement. The statistical analysis was performed with One-Way Analysis of Variance and Turkey HSD Post-Hoc (SPSS, version 17.0). Rectus femoris EMD was found to be signifi cantly longer in VetK, suggesting that aging has a negative impact on the neuromuscular activity and contractile capacity of this muscle.
- Athletes and their Sensei’s: did aging affect the lower limb kinematics in karate practitionersPublication . Branco, Marco A. C.; Brito, António Vences; Rodrigues-Ferreira, Mário André; Branco, Gonçalo A. C.Aging leads to a general decline in body functions that affects quality of life. Muscle function begins to slow the contraction from the 40 to 50 years and decreases muscle strength 1 to 1.5% per year after 60 years (Booth, Weeden, & Tseng, 1994; Vandervoort, 2002; Vandervoort & Mccomas, 1986). Older adults do less work for lower fast angular velocities (Power, et al., 2014), and less power for slow, moderate and fast angular velocities (Dalton, Power, Vandervoort, & Rice, 2012), than young adults. These losses increase as age increases. One factor that exacerbates these functional losses is the sedentary lifestyle, however, the physical exercise appears as an inversion factor, which cannot only reverse this decline but also promote an increase in functional capacity at the neuromuscular level. The athletic performance is seen as diminished in older adults, but in the case of martial arts, the karate Sensei’s are the technical execution model. This leads us to question if in karate young adults have better performance than older adults? Which in many cases are their Senseis’s. The aim of this study was to analyze the effects of the aging process in the kinematic and temporal structure of the frontal kick on veteran active karate practitioners.