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Browsing by Author "Johnson, Samuel T."

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Browsing by Author "Johnson, Samuel T."

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  • Effects of 4 weeks whole body vibration on electromechanical delay, rate of force development, and presynaptic inhibition 
    Hong, J.; Kipp, K.; Johnson, Samuel T.; Hoffman, M. A. (International Journal of Physiotherapy and Rehabilitation, 2010-10)
    Long-term functional changes after whole-body vibration (WBV) training have been attributed to adaptations in the neuromuscular system. The present study examined the effect of four weeks of WBV training on muscle functi ...
  • Effects of homosynaptic depression on spectral properties of H-reflex recordings 
    Kipp, Kristof; Johnson, Samuel T.; Hoffman, Mark A. (2012)
    The purpose of this study was to determine the effects of homosynaptic depression (HD) on spectral properties of the soleus (SOL) H-reflex. Paired stimulations, separated by 100 ms, were used to elicit an unconditioned a ...
  • Evaluating balance and strength of older women in exercise programs 
    Dinger, Melanie (Melanie Elizabeth) (2013-02-15)
    Falls are a common problem among older adults, including those who are relatively healthy and living independently. Exercise has been recommended as an intervention to reduce falls by slowing and/or reversing age-related ...
  • Functional principal component analysis of H-reflex recruitment curves 
    Kipp, Kristof; Johnson, Samuel T.; Hoffman, Mark A. (Elsevier, 2011)
    Hoffman-reflex (H-reflex) recruitment curves. Smoothed and interpolated recruitment curves from 38 participants were used for analysis. Standard methods were used to calculate three discrete variables (i.e., H[subscrip ...
  • Ground-Reaction Forces During Form Skipping and Running 
    Johnson, Samuel T.; Golden, Grace M.; Mercer, John A.; Mangus, Brent C.; Hoffman, Mark A. (Human Kinetics, Inc., 2005-11)
    Form skipping has been used to help injured athletes progress to running. Because little research has been done on form-skipping mechanics, its justifi cation as a progression to running exercises is unclear. Objective ...
  • Isometric Hip-Rotator Torque Production at Varying Degrees of Hip Flexion 
    Johnson, Samuel T.; Hoffman, Mark (Human Kinetics, Inc., 2010-02)
    Hip torque production is associated with certain knee injuries. The hip rotators change function depending on hip angle. Objective: To compare hip-rotator torque production between 3 angles of hip flexion, limbs, and s ...
  • Spectral properties of H-reflex recordings after an acute bout of whole-body vibration 
    Kipp, Kristof; Johnson, Samuel T.; Hoffman, Mark A. (National Strength and Conditioning Association, 2012-07)
    Although research supports the use of whole-body vibration (WBV) to improve neuromuscular performance, the mechanisms for these improvements remain unclear. The purpose of this study was to identify the effect of WBV on ...
  • Spinal control differences between the sexes 
    Johnson, Samuel T. (2008-12-09)
    Despite years of research, females continue to have a higher incidence of non-contact ACL injuries. One of the major findings of this research is that males and females perform certain tasks, such as, cutting, landing, a ...
  • Spinal Motor Control Differences Between the Sexes 
    Johnson, Samuel T.; Kipp, Kristof; Hoffman, Mark A. (Springer Verlag, 2012-03-08)
    Activity‐related knee joint dysfunction is more prevalent in females than males. One explanation for the discrepancy is differences in movement patterns between the sexes. However the underlying mechanisms responsible ...
  • Spinal reflex control in healthy and ACL-injured women during a distracting task 
    Perrier, Erica Taylor (2011-09-12)
    Female athletes exhibit three- to six-fold greater incidence of noncontact anterior cruciate ligament (ACL) injury relative to their male counterparts. The increased risk appears to stem from interactions between severa ...

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