Off-campus UMass Amherst users: To download campus access dissertations, please use the following link to log into our proxy server with your UMass Amherst user name and password.

Non-UMass Amherst users: Please talk to your librarian about requesting this dissertation through interlibrary loan.

Dissertations that have an embargo placed on them will not be available to anyone until the embargo expires.

Date of Award


Access Type

Campus Access

Document type


Degree Name

Doctor of Philosophy (PhD)

Degree Program


First Advisor

Jane A. Kent-Braun

Second Advisor

Barry S. Braun

Third Advisor

John P. Buonaccorsi

Subject Categories



The ability to supply cellular energy in the form of adenosine triphosphate (ATP) by oxidative phosphorylation is critical to maintaining muscle function and health. While conventional endurance exercise training has proven effective at increasing the maximal capacity for oxidative phosphorylation (V max ), it is not known whether exercise training stimulates mitochondrial ATP synthesis in resting muscle (Vrest ). Recently, short-term high-intensity interval training (HIT) training has shown potent effects on Vmax . However, little is known about (1) the effects of short-term HIT on Vrest , and (2) the time course of adaptations in V rest and Vmax following short-term HIT. Healthy young males were recruited to participate in a 2-week training intervention (6 training sessions). Each session consisted of 4-6 bouts of 30-s sprints on a cycle ergometer. Phosphorus magnetic resonance spectroscopy was used to measure V rest and Vmax in vivo in vastus lateralis: (i) prior to, (ii) 15 hours after a single session of exercise training, and (iii) after completing 6 sessions of exercise training. Two weeks of training increased peak whole-body oxygen consumption (35.8 ± 1.4 to 39.3 ± 1.6 ml·min -1 ·kg-1 , p=0.01) and exercise capacity (217.0 ± 11.0 to 230.5 ± 11.7 W, p=0.04) on the cycle ergometer. While Vmaxwas unchanged after a single session of HIT, completion of six training sessions resulted in increased muscle oxidative capacity (p<0.004). In contrast, neither a single nor six training sessions altered Vrest (p=0.74). Metabolic flux through each pathway, during maximal voluntary contractions, remained unchanged after the first training session, but 6 training sessions increased the relative contribution of ATPOX (31 ± 2 vs. 39 ± 2 % of total ATP turnover, p<0.001), and lowered the relative contribution from ATP CK (49 ± 2 vs. 44 ± 1 %, p=0.004) and ATPGLY (20 ± 2 vs. 17 ± 1 %, p=0.03). This study provided novel information about the scope and timing of bioenergetic adaptations of skeletal muscle in young healthy men following high-intensity interval training. These results highlight the plasticity of skeletal muscle oxidative metabolism, which is critical for the design of future exercise training interventions for both clinical and healthy populations.