The effects of intermittent isometric fatigue on concentric, eccentric, and isometric torque

The effects of intermittent isometric fatigue on concentric, eccentric, and isometric torque" (2013). Public Access Theses and Dissertations from the College of Education and Human Sciences. Paper 172. Fatiguing intermittent isometric (ISO) muscle actions of the leg extensors have been shown to result in a similar percent (%) decline in torque for concentric (CON), eccentric (ECC), and ISO muscle actions. However, the effects of intermittent ISO fatigue of the forearm flexors on CON, ECC, and ISO torque, have not been established. The purpose of this investigation was to determine the effects of 50 maximal, intermittent ISO forearm flexion muscle actions on CON, ECC, and ISO torque. Twenty adults (10 men (mean ± SD age = 21.9 ± 2.3 years) and 10 women (mean ± SD age = 22.7 ± 2.6 years) volunteered to perform 50 consecutive, intermittent ISO forearm flexion muscle actions. Before and after the fatiguing workbouts, peak torque (PT) was measured (randomly ordered) for CON, ECC, and ISO muscle actions. Polynomial regression analysis indicated a quadratic (R 2 = 0.97) pattern of responses during the 50 intermittent ISO muscle actions. There were no differences in mean % decline (29%) in torque values among the three types of muscle actions. The current findings indicate that the CON, ECC, and ISO muscle actions share a common mechanism of fatigue as a result of the fatiguing intermittent ISO workbout. DEDICATION I dedicate this thesis to my wife, Beatriz, who was willing to leave her career as a Pharmacist, her family, and her friends to support my education. Without her, I would not have realized my potential and this thesis would not have been possible. I also dedicate this thesis to my two children Robert, and Sebastian, who have not seen much of me during the completion of this project. It is through your smiling faces that I have found the strength to work the hardest I ever have. Everything I do is for the love of my wife and children. ACKNOWLEDGEMENTS This manuscript would not have been possible without the love, support, and understanding of my wife, Dr. I express a sincere gratitude to Dr. Terry Housh for his mentorship throughout this project. His willingness to take an active role in the entire process, for teaching me the meaning of true work ethic, for never allowing me to settle for mediocrity, and for instilling within me, a sense paying attention to …