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BIOMECHANICAL DIFFERENCES BETWEEN ONE-HANDED AND TWO-HANDED FOLLOW THROUGH TECHNIQUES AMONG PROFESSIONAL BASEBALL HITTERS
Get PDFThe purpose of this study was to compare the lead shoulder joint dynamics between one-handed and two-handed follow through batting techniques. Seventeen professional baseball players underwent motion analysis while hitting a ball off a tee using one- and two-handed follow through techniques. Linear mixed regression models were used to compare the kinematic and kinetic variables between the two techniques. Shoulder horizontal abduction, elbow flexion, and lateral trunk tilt differed between the follow through types. The shoulder kinetics increased greatly during a one-handed follow through compared to a two-handed follow through, with the horizontal adduction torque increasing 23.3 Nm and the proximal force increasing 117.2 N. A one-handed follow through increases the demands on the shoulder compared to a two-handed follow through
USING INSTAGRAM IN THE SPORTS BIOMECHANICS CLASSROOM
Get PDFThe main objective of the investigation was to evaluate the change in perception of students in the use of Instagram as a learning medium for qualitative biomechanical analysis as a part of their undergraduate sports science programme. 106 undergraduate students filled out a questionnaire on the use of smartphones, social networks and Instagram in a biomechanics classroom before and after participating in an assignment.The results of our study show the change in perspective in the participants about the use of social networks to do assignments, specifically in Biomechanics (PRE 3.0±1.4 vs POST 3.6±1.1,
THE INFLUENCE OF FILTER PARAMETERS ON THE PREDICTION ACCURACY OF THE GROUND REACTION FORCE AND JOINT MOMENTS
Get PDFAthletes’ movement biomechanics are of high interest to predict injury risk, especially in maximum effort cutting manoeuvres. However, using a standard optical measurement set-up with cameras and force plates influences the athlete’s performance. Therefore, alternative methods, e.g. Neural Networks, have been used to predict kinetic parameters based on easier to measure kinematic parameters. A previous study has evoked the question, whether the filtering processes of the input and output parameters used for training a feedforward neural network affect the prediction accuracy. To answer this question, four different filter combinations have been used during the pre-processing of joint angles, ground reaction force and joint moments of fast cutting manoeuvres, which were used to train a feedforward neural network. The results revealed a dependency
THE RELIABILITY AND USEFULNESS OF BIOMECHANICAL MEASURES OF COUNTERMOVEMENT JUMP PERFORMANCE IN ELITE ROWERS
Get PDFCountermovement jump performance and associated biomechanical variables are commonly used to monitor athletes’ neuromuscular function. The purpose of this study was to quantify the reliability and usefulness of these variables in a cohort of fourteen elite male rowers, and to apply these findings in individual athlete monitoring. Seven of the nine variables demonstrated acceptable reliability (CV \u3c 5%). Peak power was classified as OK for usefulness (CV ≈ SWC; signal-to-noise ratio ≈ 1) while all others were classified as poor. Within the athlete monitoring program, many of the observed changes in countermovement jump variables exceeded the threshold for interpretation of a clear change based on the signal-to-noise ratio. This study demonstrates the importance of understanding the reliability and usefulness measurements for accurate interpretation of monitoring data
UNDERSTANDING RATIO OF FORCES DURING EARLY ACCELERATION
Get PDFRatio of forces (RF) were investigated during early acceleration by analysing block and standing starts in trained sprinters. RF variables over the initial block exit/push-off and the first four steps were determined from force plate data, and a simple macroscopic model was also applied to obtain RF variables from the velocity time-history over the entire acceleration phase. Large positive correlations existed between mean early acceleration RF and early acceleration performance from both standing (r = 0.82) and block (r = 0.89) starts, and both theoretical maximal RF and the rate of decline in RF combined to be important predictors (adj. R2 = 92-97%) of performance. From the simple macroscopic model, maximum RF was nearly perfectly correlated with early acceleration performance (r = 0.96) and thus appears to be an excellent simple measure for early acceleration
Muon probes of temperature-dependent charge carrier kinetics in semiconductors
No full textWe have applied the photoexcited muon spin spectroscopy technique to intrinsic germanium with the goal of developing a method for characterizing excess carrier kinetics in a wide range of semiconductors. Muon spin relaxation rates can be a unique measure of excess carrier density and utilized to investigate carrier dynamics. By virtue of the localized nature of implanted muons, the obtained carrier lifetime spectrum can be modeled with a simple 1-dimensional diffusion equation to determine bulk recombination lifetime and carrier diffusivity. Temperature dependent studies of these parameters can reveal the recombination and diffusion mechanism
LARVAL DEVELOPMENT AND MORPHOLOGY OF NORTH AMERICAN BURBOT (LOTA LOTA MACULOSA)
Get PDFBurbot (Lota lota) is a freshwater fish that exhibits a circumpolar distribution and is found throughout northern longitudes of North America. It is considered an indicator species for climate change and has a substantial effect on the trophic system as it consumes fish throughout its life. Adult, spawning burbot were captured from the Sturgeon River, Pelkie, MI. Gametes were artificially fertilized and eggs were incubated until hatch in a laboratory setting. Throughout the first ten weeks of development larvae were sampled and photographed in order to measure various morphological features. Geometric and linear morphometrics were used to quantify body shape changes through development. Comparable samples were acquired from the Kootenai River, Idaho as well as various wild-caught populations from the Great Lakes. Significant differences (p\u3c0.05) were present in both linear and geometric morphology between sample groups. Variability in my data may be caused by geographic separation, habitat types and environmental conditions that differ between populations. Great Lakes larvae were more variable in growth patterns during early development in comparison to Kootenai River, Idaho, potentially indicating flexibility to settle in different habitats or the ability to deal with varying environmental conditions present in the Great Lakes. Sample groups also showed similarities in growth patterns by the flexion stage indicating developmental stability by this time. Variability in larval burbot hatching, morphology, and developmental rates likely supports the persistence of this species throughout North America
2019-2020 Northern Michigan University\u27s Excellence in Scholarship Award
No full textExcellence in Scholarship Awards
A University-wide award
Purpose: To recognize the excellence in scholarship of Northern Michigan University faculty, the Office of Provost and Vice President for Academic Affairs, working with the Faculty Grants Subcommittee, announces the Excellence in Scholarship Award.
Eligibility: Faculty (including department heads) who are currently on full-time, continuing, or active status, and have been members of the Northern Michigan University faculty for at least three (3) years at the time of the award. Prior recipients may be nominated five (5) years after receiving this award.
Criteria: Applicants will be evaluated based on excellence in research, scholarship and creative activities. Examples by which the nominees will be evaluated include: research, scholarship and/or creative activities as demonstrated by the dissemination of new knowledge and/or the application/integration of knowledge, techniques, or modes of expression in books, professional journals or other publications; presentations at professional meetings, formal exhibitions, performances, and recitals that are subject to peer review and selection processes. Special consideration will be given to nominees who involve students in their research, scholarship and creative activities.
Selection: All nominations will be reviewed by a Selection Advisory Committee chaired by the Provost and Vice President for Academic Affairs and composed of the Academic Deans along with two members of the Faculty Grants Committee.
Recognition: Recipients of the NMU Excellence in Scholarship Award will be recognized at the December Celebration of Excellence in Teaching and Scholarship
Devoted to Influenza : An Analysis of English and Nigerian Archival and Literary Depictions of the 1918-1919 Influenza Pandemic
Get PDFThis project examines how the 1918-1919 influenza pandemic is discussed in memoirs, letters, and fiction. I focus on both British and Nigerian sources to compare how different areas of the world portray the cultural significance of this disease. In the first chapter, I analyze two unpublished archival texts: the letters of Dorothy Sutton (1918), a nurse during World War I and the memoir of Private H.J. Youngman (1969). Both sources, housed in the collections of the Imperial War Museum in London, describe the symptoms and scope of the influenza pandemic. The chapter also looks at Virginia Woolf’s novel, Mrs. Dalloway (1925), to demonstrate the long recovery from these twin catastrophes. Although Mrs. Dalloway marks the beginning of Woolf’s interest in writing about illness, the novel nonetheless considers the consequences of the war to be more important than those of the pandemic. Globally, the pandemic was responsible for an estimated 20 to 100 million deaths, which was greater than the death toll from the war. My second chapter explores the global significance of the influenza pandemic by focusing on Elechi Amadi’s, The Great Ponds (1969). This Nigerian novel, in contrast with Mrs. Dalloway represents the physical symptoms of influenza in detail, and does not overshadow depictions of the pandemic with depictions of war. Amadi considers the lasting effects of the pandemic, and the importance of oral storytelling as a means of cultural remembrance
GENDER ANALYSIS OF HIP ABDUCTOR AND ADDUCTOR FORCE RATIOS
Get PDFThe strength of hip abductors (ABD) and adductors (ADD) have been implicated in athletic injuries. This study assessed ABD:ADD in a variety of testing conditions and sought to assess gender differences therein. Fifteen men and fifteen women participated in this study. Subjects performed maximum voluntary isometric muscle actions for hip ABD and ADD against a portable force plate which was manually applied statically by research personal. Subjects were tested in four conditions included supine, supine with hip flexion, seated with knee extension, and standing. Results revealed no significant main effects or gender interaction for testing position for ABD:ADD, ABD force, or ADD force (p ≤ 0.05). Results show that easy to use, valid, and reliable methods of assessing ABD:ADD exist, irrespective of testing position