Ronald Bulbulian

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The purpose of this study was to compare the magnitude and duration of motoneuron inhibition occurring as a sequel to spinal manipulation or paraspinal and limb massage. The physiologic mechanisms involved in spinal manipulative therapy and massage therapy are largely unknown. One possible hypothesis is based upon the theory that these two distinct and(More)
This study investigated the effects of particulate matter (PM) with aerodynamic diameter 0.02-1 microm (noted as PM1) inhalation during exercise on conduit artery and microvascular function. Inhalation of internal combustion-derived PM is associated with cardiovascular mortality and morbidity. Direct action of PM on the vascular endothelium is likely, as a(More)
Weight training (WT) as a countermeasure to +Gz intolerance seems to be an accepted modality, but lacks convincing support in the research literature. This study examines factors associated with WT in an operational environment as a countermeasure to +Gz intolerance. Fourteen naval aviators were assigned to a WT group (n = 7) and a non-weight-trained(More)
Five older men (aged 60–69 yr) and five young men (aged 21–29 yr) with approximately equal levels of age-corrected $$\dot VO_2$$ max were compared with respect to oxygen kinetics at equal absolute workloads (100 watts) and at equal relative workloads (45% $$\dot VO_2$$ max) on a cycle ergometer. At 45% $$\dot VO_2$$ max, half times for $$\dot VO_2$$(More)
Isokinetic leg strength and fatigue were measured in 24 male U.S. Marine Corps volunteers in a simulated sleep loss and unusually heavy work scenario. Knee extension and flexion peak torque (PT) were measured at three isokinetic speeds (1.57, 2.62 and 3.66 rad·s−1) followed by 45 consecutive maximal reciprocal contractions at 3.14 rad·s−1 to measure fatigue(More)
The effect of 30 min of cycling exercise at 60% VO2max on hemodynamic responses to the Stroop and cold pressor tests in 12 normotensive males was examined. Subjects were randomly assigned in a counterbalanced design to perform the stressors pre- and postexercise and served as their own controls. Cardiac output (CO), heart rate (HR), and stroke volume were(More)
BACKGROUND Metabolic and thermal stresses of exercise mediate the release of endogenous opioids depressing motoneuron activation (MNA). Although exercise is routinely presented as a coequal treatment for management of acute and chronic low back pain (LBP), it is not clear that exercise-induced endogenous opioid release can play a role in the analgesic and(More)
The question of the composition of exercise protocols for use by astronauts in microgravity is unresolved. Based on our knowledge of physical working requirements for astronauts during intra- and extravehicular activity and on the findings from bed-rest studies that utilized exercise training as a countermeasure for the reduction of aerobic power,(More)
The purpose of this study was to investigate the effects of former athleticism and current activity status on static and dynamic postural balance in older adults. Fifty-six subjects participated in four study groups including former athletes, currently active (AA; n = 15; 69.1+/-4.4 years.; 77.8+/-9.8 kg), former athletes, currently inactive (AI; n = 12;(More)