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Mild traumatic brain injury (mTBI) or sport-induced concussion has recently become a prominent concern not only in the athletic setting (i.e. sports venue) but also in the general population. The majority of research to date has aimed at understanding the neurological and neuropsychological outcomes of injury as well as return-to-play guidelines. Remaining(More)
PRIMARY OBJECTIVE This study examined the effects of mild traumatic brain injury (mTBI) on cerebrovascular reactivity (CVR). RESEARCH DESIGN A repeated measures design was used to examine serial changes in CVR. METHODS AND PROCEDURES Twenty subjects who recently suffered a mTBI were subjected to a respiratory challenge consisting of repeated 20 s(More)
BACKGROUND Anecdotal reports suggest the incidence of right-sided congestive heart failure (RHF) in feedlot cattle is increasing; however, the rate of occurrence and risk factors are largely unknown. OBJECTIVE The purposes of this study were to evaluate the risk of RHF over time and among feedlots, to characterize some of the risk factors for RHF, and to(More)
UNLABELLED Neck pain and muscle function in aircrew have received considerable attention. We hypothesized normalized electromyography (EMG) frequency would provide insight into appropriate methods to assess muscle fatigue in helicopter aircrew. METHODS 40 helicopter aircrew performed isometric testing that included maximal voluntary contractions (MVC) and(More)
BACKGROUND Biering-Sørenson (1984) found that individuals with less lumbar extensor muscle endurance had an increased occurrence of first episode low back pain. As a result, back endurance tests have been recommended for inclusion in health assessment protocols. However, different studies have reported markedly different values for endurance times, leading(More)
PRIMARY OBJECTIVE To assess and compare the parasympathetic state of individuals in healthy vs concussion groups, by measuring cardiovascular metrics under resting and baroreflex conditions using a squat-stand manoeuvre. RESEARCH DESIGN This was a retrospective mixed-method study, with participants who sustained a medically diagnosed sport concussion (n =(More)
INTRODUCTION Night vision goggles (NVG) are linked to increased neck muscle activation and pain. Counterweights (NVGcw) are hypothesized to mitigate these effects. The purpose of this study was to investigate the muscular response to varying helmet loads and postures. METHODS Volunteering from a representative squadron were 16 male helicopter aviators(More)
Previous research demonstrated higher maximal voluntary contraction (MVC) force with upright vs. inverted positions in untrained individuals. The purpose was to determine the effects of inversion on force, activation, and cardiovascular responses before and following fatigue in trained individuals. Twelve male athletes completed two trials: upright and(More)
INTRODUCTION Neck pain in the Canadian Forces (CF) helicopter community related to night vision goggles (NVG) use is of growing concern. This study compares symptom reports and physiological responses and provides comparison between pilots and flight engineers (FE). METHODS Aircrew (22 pilots, 18 FE) detailed their neck pain symptoms, flight history, and(More)