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https://www.readbyqxmd.com/read/22890424/measurement-of-power-in-selectorized-strength-training-equipment
#1
Andrea Biscarini
The author derived the exact analytical expression of the instantaneous joint power in exercises with single-joint, variable-resistance, selectorized strength-training equipment, taking into account all the relevant geometric, kinematic, and dynamic variables of both the movable equipment elements (resistance input lever, cam-pulley system, weight stack) and of the user's exercising limb. A numerical algorithm was also designed to express, in the presence of a cam, the rectilinear kinematic variables of the weight stack as a function of the rotational kinematic variables of the resistance input lever, and vice versa...
July 2012: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/21975575/measurement-of-power-in-selectorized-strength-training-equipment
#2
Andrea Biscarini
We derived the exact analytical expression of the instantaneous joint power in exercises with single-joint, variable-resistance, selectorized strength-training equipment, taking into account all the relevant geometric, kinematic and dynamic variables of both the movable equipment elements (resistance input lever, cam-pulley system, weight stack) and of the user's exercising limb. A numerical algorithm was also designed to express, in the presence of a cam, the rectilinear kinematic variables of the weight stack as a function of the rotational kinematic variables of the resistance input lever, and vice versa...
October 3, 2011: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/19838383/correlation-of-the-slap-lesion-with-lesions-of-the-medial-sheath-of-the-biceps-tendon-and-intra-articular-subscapularis-tendon
#3
William F Bennett
BACKGROUND: Superior labral anterior to posterior (SLAP) lesions have been well described in the literature and are thought to be secondary to traction injuries to the biceps anchor and/or falls on the outstretched arm. The pulley has recently been described as a structure that aids in the prevention of biceps instability. The intra-articular subscapularis insertion (IASS) has been noted to contribute to the robust nature of the medial sheath. The purpose of the study was to determine a potential correlation of SLAP lesions and pulley lesions with/without IASS lesions, (hereafter referred to as medial sheath) as forces that can disrupt the biceps anchor and may also disrupt structures of the medial sheath or vice-versa...
October 2009: Indian Journal of Orthopaedics
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