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T2 Mapping of Muscle Activation During Single-Leg Vertical Jumping Exercise

Thompson, William Kevin
http://rave.ohiolink.edu/etdc/view?acc_num=case1194982561

Abstract Details

2008, Master of Sciences, Case Western Reserve University, Biomedical Engineering.
This study investigated using elevation of the spin-spin relaxation time (T2) in magnetic resonance imaging (MRI) to map recruitment differences in the thigh and calf between two distinct populations during single-leg jumping. Twelve healthy subjects formed two groups based on jumping ability. Subjects took a maximal exercise test (MET) to determine aerobic fitness. Subjects performed 5x10 single-leg jumps at body weight (Post1) and at body weight+33% (Post2) on a force platform while wearing a weighted vest at Post2. Performance was determined as concentric jumping power normalized to the subject’s maximum aerobic power. Spin echo MRI at Baseline, Post1 and Post2 determined muscle activation as the percentage of muscle pixels with elevated T2 after exercise. A novel metric based on the performance/activation ratio highlighted recruitment efficiency differences between groups. Results suggest that recruitment efficiency throughout the lower limb (especially suppression of co-activating antagonists) was the dominant factor in enhancing jumping performance.
Marco Cabrera (Advisor)
120 p.
magnetic resonance imaging; functional MRI; MRI; muscle; exercise; exercise physiology; jump; jumping; recruitment; activation; quadriceps; hamstrings; calf; force platform; maximal exercise test; maximum aerobic power; spin-spin relaxation

Recommended Citations

Citations

  • Thompson, W. K. (2008). T2 Mapping of Muscle Activation During Single-Leg Vertical Jumping Exercise [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1194982561

    APA Style (7th edition)

  • Thompson, William. T2 Mapping of Muscle Activation During Single-Leg Vertical Jumping Exercise. 2008. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1194982561.

    MLA Style (8th edition)

  • Thompson, William. "T2 Mapping of Muscle Activation During Single-Leg Vertical Jumping Exercise." Master's thesis, Case Western Reserve University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1194982561

    Chicago Manual of Style (17th edition)

case1194982561
1,505
© 2007, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.