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      • College of Graduate and Postdoctoral Studies
      • Electronic Theses and Dissertations
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      • HARVEST
      • College of Graduate and Postdoctoral Studies
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      The Effects of Training with Free Weights or Machines on Muscle Mass, Strength, and Testosterone and Cortisol Levels

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      FINAL_THESIS.pdf (1.191Mb)
      Date
      2008
      Author
      Schwanbeck, Shane
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      Free weights are generally preferred over machines by practitioners of strength training because they involve incorporation of greater muscle mass because of the greater stabilization that is required. Using free weights may therefore allow one to gain more muscle mass and strength with chronic training; however, this has not been thoroughly addressed. The purpose of this study was to compare the effect of training with free weights or machines on muscle mass, testosterone and cortisol concentrations, and strength. Fifteen males and twenty-one females aged 22 ± 3 y with previous weight training experience trained using only free weights or only machines for eight weeks. Hormone concentrations were assessed via saliva samples pre and post workout at the beginning, mid-way, and end of the study. Muscle thickness, lean tissue mass, and strength were measured at the beginning and the end of the study. Elbow flexor thickness increased significantly by 3.9% and a 5.1% in the free weight group and machine group, respectively (p
      Degree
      Master of Science (M.Sc.)
      Department
      College of Kinesiology
      Program
      College of Kinesiology
      Supervisor
      Chilibeck, Phil
      Committee
      Farthing, Jon; Arnold, Bart; Rodgers, Carol
      Copyright Date
      2008
      URI
      http://hdl.handle.net/10388/etd-12172008-121030
      Subject
      strength training
      hormones
      hypertrophy
      Collections
      • Electronic Theses and Dissertations
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