Comparative study between two elbow flexion exercises using the estimated resultant muscle force

Análise do torque de resistência e da força muscular resultante durante exercício de extensão de quadril no Pilates e suas implicações na prescrição e progressão

“…The WMMA is the result from the sum of the products between the perpendicular distance of each muscle (d ┴ ) and its respective physiological cross-sectional area (PCSA) divided by the sum of the cross-sectional areas of the muscles 13,14 (Equation 4). In the present study, HE muscles included: biceps femoris, semitendinosus, semimembranosus and gluteus maximus and flexor muscles included: rectus femoris, psoas, iliacus, sartorius and tensor fasciae latae.…”

“…The signals of electrogoniometry were filtered by a band-pass digital filter butterworth, third order, with a cutoff rate of 3 Hz, with the support of the software SAD32, version 2,61. 07mp, previously used by Loss and Candotti 13 .…”

“…The analysis of Γ R and Γ M were conducted according to recommendations from Loss e Candotti 13 , based on the construction of free-body diagrams (FBD) from the body segments during movement. Figure 2a illustrates the FBD in an intermediate position of the ROM, designed in the plane of execution of the exercise.…”

“…The reason for this is that the sping's strength (given by the constant of strain and the variation of its length) in addition to its respective perpendicular distance (directly determined by the fixation site of the spring) compose the resistance torque (T R ) offered by this exercise, during the exercise range of motion (ROM). Thus, in clinical practice, Γ R assessment (which considers the variations in the constant of strain and the fixation height of the spring) may provide useful quantitative data for progressing the intensity of the program over the course of the treatment and also indicate in which joint position the external load is maximum 11,[13][14][15] , allowing clinicians to prioritize strength gains in specific ranges of motion.…”

Eletromiografia do bíceps braquial em contrações dinâmicas

“…O entendimento dos mecanismos envolvidos na fadiga neuromuscular em atividades ocupacionais e dinâmicas, entretanto, parece ser mais relevante para as funções da vida diária 3,16 . Exercícios funcionais são usados por profissionais da saúde, como fisioterapeutas que pretendem reabilitar pacientes lesionados [5][6] , ou personal trainers que querem induzir a hipertrofia muscular de um indivíduo saudável 3,16,17 . Durante contrações dinâmicas diversos fatores como mudanças no número de unidades motoras ativadas, na relação força/potência ao longo do movimento, no comprimento do músculo 18,19 podem levar a interpretações erradas da EMG 20 .…”