OBJECTIVE To identify the effects of altered ventricular activation during dobutamine stress on left ventricular function in normal subjects and in patients with coronary artery disease, and to distinguish these from an inotropic response. DESIGN Prospective analysis of 12 lead ECG and echocardiogram at rest and at peak stress. SETTING Tertiary referral centre for cardiac disease equipped w...

Cummiskey, Brian R. MSME, Purdue University, May 2015. Characterization and Evaluation of Head Impact Sensors and Varsity Football Helmets. Major Professor: Eric A. Nauman, School of Mechanical Engineering. An increased understanding of the effects of brain injury in recent years has led to greater attention being given to the topic. A desire to investigate the causal agents of these injuries i...

In this article, the authors analyze kinematic characteristics of reaching movements to memorized visual target locations. An increase in target distance was associated with a decrease in correlation between peak acceleration and movement distance and with a simultaneous increase in correlation between peak acceleration and movement time. According to the previous work on motor control in isome...

We studied the dynamics of lexical decisions by asking participants to categorize lexical and nonlexical stimuli and recording their mouse movements toward response buttons during the choice. In a previous report we revealed greater trajectory curvature and attraction to competitors for Low Frequency words and Pseudowords. This analysis did not clarify whether the trajectory curvature in the tw...

The design of tall buildings, while concerned with efficiently and effectively carrying the anticipated loads imposed upon the structures, is largely concerned with serviceability and habitability issues. The latter issue may still require attention, even for buildings designed to meet lateral drift requirements (Kareem et al. 1999). As such, structural accelerations, as a function of return pe...

This study measured and analyzed the amount of exercise in performing the basic pumsae of taekwondo, namely, taegeuk pumsae Chapter 1 through 8 using an accelerometer, calculated energy consumption from the amount of exercise, and proposed it as an indicator of exercise prescription for successful aging. We attached an accelerometer armband to 39 subjects of the experiment (28 males and 11 fema...

Slipping and tripping contribute to a large number of falls and fall-related injuries. While the vestibular system is known to contribute to balance and fall prevention, it is unclear whether it contributes to detecting slip or trip onset. Therefore, the purpose of this study was to investigate the effects of slipping and tripping on head acceleration during walking. This information would help...

We present results of a study of torsional eye movements evoked by earth-vertical accelerations along the subject's longitudinal axis. The earth-vertical stimulus leads to a gravito-inertial acceleration vector that changes magnitude but not direction. It can therefore be viewed as a dynamic change of the gravity level. Up-down oscillations induced relatively symmetric cyclovergence (0.6-2.2 de...

We characterized the interaural translational vestibulo-ocular reflex (tVOR) in 6 normal humans to brief (approximately 200 ms), high-acceleration (0.4-1.4g) stimuli, while they fixed targets at 15 or 30 cm. The latency was 19 +/- 5 ms at 15-cm and 20 +/- 12 ms at 30-cm viewing. The gain was quantified using the ratio of actual to ideal behavior. The median position gain (at time of peak head v...