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A Kinematic Comparison Between Greater-and Lesser-Skilled Powerlifters Doing the Traditional Style DeadliftCanales, Daniel 12 1900 (has links)
Comparison kinematic models of the traditional style deadlift are presented. Data was obtained through film and analyzed via computer and computer graphics. The comparison between the models revealed that the greater-skilled: 1. used less trunk flexion from the instant of initial trunk lean to the instant of maximum trunk lean, 2. used less knee extension (in same time interval as 1), and 3. demonstrated a smaller horizontal distance between the body center of mass (CM) and the CM of the bar at the instant the bar left the platform. A trend was also observed in which the greater-skilled subjects demonstrated less thoracic lean than the lesser-skilled group at the time the bar reached knee level.
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Unilateral Traditional Weight Lifting Generates Greatest Acute Upper Body Power OutputNakachi, Evan H 01 October 2014 (has links) (PDF)
Bilateral deficit (BLD) is a phenomenon where the force generated from simultaneous bilateral limb contractions is less than the sum force generated by separate right and left limb contractions. There have been many BLD studies, but the measures of force generation have predominantly been with isometric and isokinetic contractions. There are, however, no dynamic upper body isotonic unilateral weight lifting studies on acute power output. The purpose of this study was to determine acute power output between bilateral and unilateral weight lifting under the conditions of traditional and circuit weight lifting. Seventeen male BYU rugby players (age = 21.8 ± 2.1 years; mass = 93.5 ± 12.5 kg; height = 181.9 ± 5.0 cm) participated in the study. Each subject participated in 4 randomized weight lifting testing sessions separated by at least 48 h. Each weight lifting protocol included 6 dumbbell lifts (bench press, bent over row, overhead press, bicep curls, front raise, and bent over raise) performed as explosively as possible for 5 sets of 5 repetitions at 40–50% of 1RM. GymAware [GYM] units measured power output for the right and left arms. Peak and mean power (of all lifts combined) was greatest in the unilateral traditional weight lifting (UTWL) group compared to all other groups (p < .0001 for each comparison). No significant differences in overall peak and mean power (all lifts combined) existed between the other 3 groups. UTWL peak and mean power outputs were significantly highest for all lifts. UTWL and bilateral traditional weight lifting (BTWL) generated the second or third highest peak power outputs for all lifts, but they were not statistically different from each other except for the bent over raise. Bilateral circuit weight lifting (BCWL) generated the lowest peak power output in all lifts, but was not statistically different from the third lowest peak power output except for the bent over raise. Our study determined that dynamic upper body isotonic unilateral movements generate significantly greater power output than dynamic upper body isotonic bilateral movements using free weights. It was also concluded that traditional weight lifting protocols generated greater power output than circuit weight lifting protocols.
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A quantitative placebo controlled study of the efficacy of manipulation of acromioclavicular joint dysfunction in weight trainersJordan, Warren Gray January 2009 (has links)
Thesis (M.Tech.: Chiropractic)--Durban University of Technology, 2009 / Objective: The efficacy of manipulation as compared to placebo in the treatment of two groups of weight trainers with Acromioclavicular (AC) Joint Dysfunction. Methods: Twenty patients (n=20), using randomised sampling were allocated to two intervention groups. Patients in each group received four treatments each over a two-week period and assessed at initial, one week, two weeks and one month follow ups. Objective measures included Algometer and Inclinometer readings. Numerical Pain Rating Scales (NRS), Shoulder Rating Questionnaire (SRQ) and the Shoulder Pain and Disability Index (SPADI) measured subjective outcomes. Results: Manipulation demonstrated significant improvement in objective findings. Subjective outcomes did not show significant difference between the manipulation and placebo groups. Conclusion: Manipulation, when compared to placebo, can be considered as an effective treatment intervention for the treatment of AC joint dysfunction with particular reference to objective outcomes. Although, caution needs to be utilised in accepting this outcome due to limitations in sample size, subjective measure sensitivity and specificity as well as the stringency of the inclusion and exclusion criteria.
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Position Statement on Youth Resistance Training: The 2014 International ConsensusLloyd, Rhodri S., Faigenbaum, Avery D., Stone, Michael H., Oliver, Jon L., Jeffreys, Ian, Moody, Jeremy A., Brewer, Clive, Pierce, Kyle C., McCambridge, Teri M., Howard, Rick, Herrington, Lee, Hainline, Brian 01 April 2014 (has links)
The current manuscript has been adapted from the official position statement of the UK Strength and Conditioning Association on youth resistance training. It has subsequently been reviewed and endorsed by leading professional organisations within the fields of sports medicine, exercise science and paediatrics. The authorship team for this article was selected from the fields of paediatric exercise science, paediatric medicine, physical education, strength and conditioning and sports medicine.
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Myocardial structure and function differences between steroid using and non-steroid using elite powerlifters and endurance athletesClimstein, Mike 25 September 1989 (has links)
The purpose of this study was to compare the myocardial structure and
function among endurance athletes (n.12), powerlifters/steroid users (n=5),
powerlifters/non-steroid users (n=6), and sedentary controls (n=4).
All subjects had a M-mode echocardiographic examination of their left
ventricles under resting conditions. The echocardiographic measurements
recorded and analyzed were of the left ventricular posterior wall at diastole
and systole, left ventricular internal diameter at diastole and systole, and
inter-ventricular septal thickness at diastole and systole. Myocardial function
measurements consisting of left ventricle ejection time, left ventricular mass,
mean ventricular contractile force, and percent fractional shortening were
also recorded and analyzed. A One Way Analysis of Variance was used to
analyze the data for statistical significance. A Tukey's HSD post-hoc test was
used to determine statistical significance between the groups.
A significant difference (p =0.02) was found for inter-ventricular septal
thickness during diastole. All three athletic groups had significantly thicker
inter-ventricular septa' thickness during diastole as compared to the controls.
Power lifters/steroid users had the thickest inter-ventricular septal thickness
(18.7 mm), followed by endurance athletes (18.6 mm), and powerlifters/nonsteroid
users (16.5 mm). Overall, powerlifters/steroid users had the thickest
walls at systole and diastole, while endurance athletes had the greatest
internal diameters relative to the size of the left ventricle.
Statistically significant differences among the groups were found for all
four myocardial functional parameters: left ventricular ejection time (p = 0.03),
left ventricular mass (p = 0.002), mean ventricular contractile force of (p
0.0013), and percent fractional shortening (p = 0.05). Power lifters/steroid
users had the fastest left ventricular ejection times, largest left ventricular
mass, greatest mean ventricular contractile force, and greatest percent
fractional shortening. Endurance athletes had the slowest left ventricular
ejection times, second largest left ventricular mass, lowest mean ventricular
contractile force, and third lowest percent fractional shortening.
The results indicated that not all individuals participating in high level
endurance or powerlifting training and competition demonstrated complete
adaptations in myocardial structure and function. Power lifters/steroid users
however, demonstrated myocardial functional adaptations that were
significantly different from powerlifters/non-steroid users, endurance athletes,
and controls.
The results of this study cannot attribute these changes either to the
use of large amounts of anabolic steroids, or long-term, high-intensity training
and competition in powerlifting. However, the study identified alterations in
myocardial functions in powerlifters/steroid users, and contributes to the
existing body of knowledge regarding the use of anabolic steroids by
athletes. / Graduation date: 1990
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Acute and early chronic responses to resistance exercise using flywheel or weightsNorrbrand, Lena, January 2008 (has links)
Lic.-avh. (sammanfattning) Stockholm : Karolinska institutet, 2008. / Härtill 3 uppsatser.
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The effects of strength training on arterial structure and function in middle-aged and older adultsCortez-Cooper, Miriam Yvette 28 August 2008 (has links)
Not available / text
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Comparative effects of eccentric and concentric muscular contractions on strength increase of the knee extensorsKnoeppel, David E., 1948- January 1974 (has links)
No description available.
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A quantitative placebo controlled study of the efficacy of manipulation of acromioclavicular joint dysfunction in weight trainersJordan, Warren Gray January 2009 (has links)
Thesis (M.Tech.: Chiropractic)--Durban University of Technology, 2009 / Objective: The efficacy of manipulation as compared to placebo in the treatment of two groups of weight trainers with Acromioclavicular (AC) Joint Dysfunction. Methods: Twenty patients (n=20), using randomised sampling were allocated to two intervention groups. Patients in each group received four treatments each over a two-week period and assessed at initial, one week, two weeks and one month follow ups. Objective measures included Algometer and Inclinometer readings. Numerical Pain Rating Scales (NRS), Shoulder Rating Questionnaire (SRQ) and the Shoulder Pain and Disability Index (SPADI) measured subjective outcomes. Results: Manipulation demonstrated significant improvement in objective findings. Subjective outcomes did not show significant difference between the manipulation and placebo groups. Conclusion: Manipulation, when compared to placebo, can be considered as an effective treatment intervention for the treatment of AC joint dysfunction with particular reference to objective outcomes. Although, caution needs to be utilised in accepting this outcome due to limitations in sample size, subjective measure sensitivity and specificity as well as the stringency of the inclusion and exclusion criteria.
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Asymmetric lifting using a weight beltAurslanian, Dina B. January 1993 (has links)
The purpose of this study was to use EMG data of the erector spinae muscles synchronized with three-dimensional video techniques to determine the body's responses to asymmetric lifting under weight belt conditions. The subjects performed static maximum voluntary exertions and dynamic lifts from 0° and 45° from the midline of the body. Three weight belt conditions were used. EMG data revealed significant differences in EMG variables with belt conditions. Weight belt use decreased burst area, peak voltage, and maximum frequency. Kinematic data indicated a significant difference in the left knee and left and right elbow range of motion when the type of lift, symmetric or asymmetric, was considered. Lifting technique also produced a significant effect on the maximum and minimum velocity of the center of mass. The results of the study indicate that weight belt use is an effective means of reducing spinal compression and thus may be helpful in preventing low back injury. / School of Physical Education
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