6, 8, 9 Adequate ankle mobility is necessary for normal gait, as well as participation in many sporting and recreational activities. 6 A normal ankle moves from approximately 20° dorsiflexion to 50° plantar flexion in the sagittal plane and total range of motion in the frontal plane is approximately 35° (23° inversion 12° eversion). 6, 7 On the other hand, plantar flexion describes the extension of the ankle so that the foot points down and away from the leg. Dorsiflexion is the movement at the ankle joint where the toes are brought closer to the shin, curling upwards, and decreasing the angle between the dorsum of the foot and the leg. The ankle joint is formed by the dome of the talus fitting into a mortise formed by the tibia and the fibula where this joint produces movements of dorsiflexion and plantar flexion of the foot. 1, 4 But, interestingly, in regards to ankle range of motion (ROM) there are a limited number of studies that have assessed ankle-dorsiflexion and plantar flexion ROM when comparing RE with free-weights versus machines. 4, 5 On the other hand, machines are a fixed-form exercise that is limited to moving through fewer planes with a stable environment. Free-weights utilize isotonic resistance that provides the same amount of resistance throughout the range of motion, thus free-weights allow for movement in multiple planes requiring balance. 1-3 However, there are differences of opinion whether the use of a RE program that consist of free-weights or machines is better for building muscle mass, strength, and injury prevention. Specific devices are often used to evaluate muscle strength involving multiple variables that address training goals and individual needs (e.g., exercise order, rest interval between sets, exercise mode, training frequency, movement velocity, training volume, repetitions per set, number of sets, type of muscle action, and the load intensity). The exercises represent a combination of dynamic actions and static effort. Resistance exercises (RE) have been proposed in sports guidelines to improve physical conditioning and health 1. Keywords: ankles, functional performance, range of motion, resistance training Introduction This study found a greater ankle-dorsiflexion ROM and performance during the Single Leg Hop Test in practitioners of RE with free-weights, showing a better control of sagittal plane movements. On the other hand, the Single Leg Hop Test (Δ% left=16.3% Δ% right=15.4% P<0.05) and number of jumps (Δ% left=27.9 % Δ% right=26.1 % P<0.05) recorded were lower in the Free-weights Group compared to the Machines Group. Ankle-dorsiflexion ROM showed a significant difference (Δ% left=21.1% Δ% right=25.8% P0.05). Ankle functional stability was assessed with the Single Leg Hop Test in both limbs. The rising on the heel and the rising on toes were used to assess endurance of the ankle dorsiflexor and plantar flexor muscles, respectively. Active ankle-dorsiflexion and plantar flexion range of motion were measured with subjects lying prone with an extended knee on a standard treatment table. ROM measurements were taken in both ankles with a digital goniometer. All subjects practiced regularly RE 5.3☐.7 d∙wk-1 and low aerobic training of 1.2☐.5 d∙wk-1 with a total time volume of 254.9☙.4 min∙wk-1. They were separated into two groups: (a) Free-weights and (b) Machines. Twenty-five men participated in this study. The purpose of this investigation was to compare ankle functional performance and ankle range of motion (ROM) between practitioners of resistance exercise (RE) with free-weights versus machines. Comparison of ankle range of motion and functional performance between practitioners of resistance exercise with free-weight vs. Please type the correct Captcha word to see email ID.Įduardo Lobo, 2 Marcos Braz, 2 José Carlos de Campos Jr, 2 Gustavo Leporace 3ġProfessor of the Master’s and Doctorate Program in Rehabilitation Science at UNISUAM (Augusto Motta University Center), BrazilĢUNISUAM (Augusto Motta University Center), BrazilģCoordinator of Biomechanics Research at Institute Brazil of Technologies in Health, BrazilĬorrespondence: Alex Souto Maior, PhD, Augusto Motta University Center – UNISUAM, Postgraduate Program in Rehabilitation Sciences, Praça das Nações, 34 – Bonsucesso, ZIP Code 21041010 - Rio de Janeiro, RJ – BrasilĬitation: Maior AS, Lobo E, Braz M, et al. Regret for the inconvenience: we are taking measures to prevent fraudulent form submissions by extractors and page crawlers.
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