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Dissertations / Theses on the topic 'Weight lifters'
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1
Fild, Deborah S. "The effects of oral arginine supplementation on growth hormone, arginine, and somatomedin levels during energy restriction in male weight lifters." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-11242009-020056/.
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Williams, David Michael. "A Social Cognitive Model of Creatine Use Among Male, Recreational Weight-Lifters." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/30946.
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This study investigated social cognitive
determinants of creatine supplementation
among 171 male, undergraduate, recreational
weight-lifters. Participants responded to a
packet of questionnaires that assessed their
history and rate of creatine use, self-efficacy
for improving their workout performance with and
without creatine, and expected outcomes of
improved workout performance and creatine use,
as well as several other demographic variables.
Fifty percent of the sample reported past creatine
use. The data was used to establish the internal
consistency, test-retest reliability and
predictive validity of factor-based scales for
valued outcome expectancies and disincentives for
creatine use scales. A social cognitive model was
shown to predict past creatine use (R2 = .372).
The results lay the groundwork for further
examination of the determinants of creatine
supplementation and the use of other controversial
and potentially harmful performance-enhancing
dietary supplements.<br>Master of Science
3
Lawrence, Michael A. "Effects of elastic resistance on concentric force, concentric power, and eccentric velocity during the bench press." CardinalScholar 1.0, 2010. http://liblink.bsu.edu/uhtbin/catkey/1567419.
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Elastic bands are becoming more popular in strength and power training. Although increases in strength and power have been anecdotally reported with high loads of elastic resistance, there is no research on large band tensions and their effects on force and power variables. The purpose of this study was to quantify peak concentric force, peak concentric power and peak eccentric velocity produced by the subject when using differing levels of elastic resistance (0%, 20%, 50% and 75% of the total load being elastic resistance) in the bench press. Seven experienced male powerlifters and body builders participated in this study. Prior to subject testing all elastic bands were calibrated for force output throughout the bench press range of motion. Each subject performed a single repetition maximum press to determine the total correct testing load (85% of maximum press). The subjects then performed four presses with various elastic band resistances, each having the total equivalent weight of 85% of the subject’s maximal press weight at lockout. Dependent variables were peak concentric force, peak concentric power, and peak eccentric velocity as produced by the subject. A one-way ANOVA was used to determine the differences among the four levels of elastic resistance (ER) used in the study (α =
0.05). Compared to the baseline condition (2123.6 ± 499.9N), significantly lower average peak concentric force was observed with ER of 75% (1451.2 ± 151.0N, 31.9% decrease) (p = .010) and with an ER of 50% (1781.1 ± 174.3N, 16.4% decrease) (p = .052). When compared with baseline peak concentric power (702.6 ± 274.6W), higher peak power was observed in all band trials: 20% (895.2 ± 187.7W, 27.4% increase), 50% (972.5 ± 189.8W, 38.4% increase) and 75% (979.6 ± 171.0W, 39.4% increase) (p = .009; p = .007; p = .033, respectively). There was no significant difference in peak concentric power in any ER trials. No significant differences (p = .080) were seen in peak eccentric velocity. Therefore ER loads of 20, 50 and 75% provide greater stimuli for producing peak concentric power than no ER, with only a 20% load of ER maintaining the same peak concentric force production as baseline. ER loads of 50 and 75% may not be as effective a stimuli as free weights when the training objective is to increase force production.<br>School of Physical Education, Sport, and Exercise Science
4
Hawkins, Colleen E. "The effects of oral supplementation of the amino acid arginine on body composition and muscle function during energy restriction in male weight lifters." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/41598.
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Manufacturers of amino acid supplements claim that they can act as natural stercoids. Eighteen experienced male weight lifters were studied to test this hypothesis for the amino acid arginine.<br>Master of Science
5
Faries, Mark Lutz Rafer S. Greenwood Mike Frisch Michael B. "Self-selected intensity, repetitions, RPE and adherence of novice female weight lifters during 6-weeks of resistance training." Waco, Tex. : Baylor University, 2006. http://hdl.handle.net/2104/4891.
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Sturgill, Daphne J. L. "The effects of a hypocaloric diet, with varying protein/carbohydrate ratios, on the nitrogen balance of male weightlifters." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94474.
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The purpose of this study was to examine the effects of a hypocaloric liquid diet, with varied protein/carbohydrate ratios, on two groups of male weightlifters. A maintenance diet was consumed by all subjects for one week prior to the experimental phase, and all subjects participated in a resistance weight training program. The experimental groups consumed either a moderate protein/high carbohydrate diet (MP/HC) with 0.8 g/kg body wt/d protein or high protein/moderate carbohydrate diet (HP /MC) with 1.6 g/kg body wt/d protein diet for the experimental week. Twenty-four hour urine samples were collected daily and two exercising sweat samples were taken for each subject. Fecal nitrogen losses were estimated and added to urine and sweat values for daily nitrogen excretion. There was a significant difference in nitrogen balance between the groups over time. Nitrogen balance was positive for the HP/MC group (4.13 g/d) and negative for the MP/HC group ( -3.19 g/d) . The results of this study suggest the possibility that weightlifters consuming a hypocaloric diet should consume more than the US RDA for protein to maximize retention of body protein.<br>M.S.
7
Dunn, Andrea L. "Imagery content and perspective and its effect on development of muscular strength." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76032.
Full textAbstract:
Equivocal results for imagery as a beneficial adjunct to performance may be due to diverse methodologies as well as a lack of clarity about the relationship between imagery ability and imagery perspective. This study used a randomized group design with repeated measures to evaluate the effect of imagery content and perspective on strength.
Subjects were 44 women, ages 19 to 34, classified as beginning weight lifters. All were pre-tested on imagery ability and knee joint strength. Subjects were randomly assigned to one of three training conditions: (1) an internal imagery perspective; (2) an external imagery perspective, and (3) no imagery training. Training was conducted twice per week for eight weeks. Subjects were also asked to work out a third time.
The dependent measure to assess strength at the beginning, middle, and end of the eight-weeks was the Cybex II dynamometer. The dependent measure to assess imagery vividness was the Betts questionnaire Upon Mental Imagery. Imagery perspective was measured by the Imagination Exercise.
Results of a two-way analysis of variance with repeated measures using Cybex II found significant strength differences for: (1) all groups and (2) the internal imagery group. A significant linear trend was also found between groups. Additionally, a two-way analysis of variance with repeated measures, using imagery ratings found significant improvement in kinesthetic vividness for all groups.
This investigation is the first experimental study using beginning athletes to demonstrate significant performance effects using mental training above and beyond significant effects due to physical training.<br>Master of Science
8
Perry, Colleen Denise 1962. "Spine, hip and forearm bone mineral indices of eumenorrheic, oligomenorrheic and amenorrheic athletes." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276681.
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This study describes bone mineral index (g/cm²) of the distal and mid forearm, spine and hip in gymnasts/weight trainers, and runners with varying menstrual status. 12 eumenorrheic gymnasts/weight trainers (EGW), 11 eumenorrheic runners (ERU), 8 oligomenorrheic gymnasts/weight trainers (OGW), 3 oligomenorrheic runners (ORU) 4 amenorrheic runners (ARU) and a eumenorrheic control group (EC) of 18 subjects were examined. Bone mineral index (BMI) was measured using single and dual photon absorptiometry. EGW had greater BMI than ARU and EC (spine, hip and distal and mid forearm) and ERU (femur and distal forearm). The ARU were not significantly lower in BMI than the ERU. The ARU were only significantly lower in BMI than the EC at the distal forearm. OGW were not significantly greater in BMI than ORU. The OGW had greater BMI than the ARU (spine, femur and distal forearm), ERU and EC (femur and distal forearm). These results show higher BMI in gymnasts/weight trainers, independent of menstrual status, than in runners and controls.
9
Brodie, E. E. "Spatial and temporal factors in the discrimination of lifted weights." Thesis, University of Stirling, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370534.
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10
Liao, Shing-Chou, and 廖星州. "The Balance Control with Loading in Elite Collegiate Female Weight Lifters." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/04545640267486378925.
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碩士<br>國立體育學院<br>教練研究所<br>92<br>The motion of the weight lifting needs the interaction between the static and dynamic situation to check the balance control. Because there is no researches correlated with the female weight lifters’ balance control ability, this research was performed by the evaluation of the static and dynamic balance control of female college weight lifters and made up a comparison g group by ordinary people. The participants for this study are all female. Both experimental and comparison group are ten people. After collecting the data, at first, compared the experimental group and comparison group with balance abilities in static, dynamic, behind the shoulder and front the neck four different loading positions by the T-test for independent sample. Second, this research is analyzed the difference of the experimental and comparison group with different type of loading in static and dynamic mode by the T-test for dependent sample. Third, the correlation evaluation of the balance control ability for both groups was performed by the Pearson’s product-moment correlation. Fourth, the results of comparison of the features of balance control within and between groups were presented by the plots with 95%confidence interval.
The results revealed that:
1.The result reveals that there are no specific deviations during static but without loading situation and applies the weight lifters didn’t have better performance than ordinary people through this balance control ability. However, the weight lifters have better performance than ordinary people through static loading and all dynamic balance situations. The main reason could be the characteristic of the training program for weight lifting improving the balance control with loading.
2.The movements that weight lifters performed through the experiment are almost the same during the real competition so that there is no significance different between static and dynamic balance. Besides, because of the situation that loading behind the shoulder, there is the significance different while ordinary participants loading behind the neck in dynamic situation.
3.Through the Pearson’s product-moment correlation within two groups, the balanced every balance control performance of weight lifters could caused by the specific training programs.
4.During the static balance control valuation, the loading didn’t affect more within two groups; on the contrary, during the dynamic balance control evaluation, the performance of the comparison group was lower. Besides, there was the much more significance different within two groups in dynamic situation.
Hoping this research can supply a research about the movement coordination and balance training to provide a guide to help weight lifters and profession coaches.
11
莊鑫裕. "Relationship between Maximal Staticc Respiratory Pressures and Upper Body Strength in Weight-lifters." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/72987344380603832286.
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碩士<br>國立體育學院<br>運動科學研究所<br>86<br>The changes of exercise training on the adaptive response of respiratory muscles have been gradually grown in recent years. The effects of exercise training on respiratory muscles have clearly demonstrated in animal and human studies. In the view of anatomy. respiratory muscles are upper body muscles, However,Previous studies had not clearly demonstrated that did upper body or lower body training result in respiratory muscle strength to be improved? In addition, most of the subjects in those studies were nornal humans and penitents, Little was unknown about the athletes. Therefore, one of the purposes of this study was to exam the effect of weight lifting on respiratory muscle strength. The other one was to determine the relationships between respiratory muscle strength and upper body strength. Subjects were 22 males of elite weight-lifters and 20 untrained males. Measurements including were maximal static respiratory pressures, lung functions, and three upper body strengths tests (press,back-lift, and trund flexion tests. The measurements of Maximal static respiratory pressures on inspiration and expiration were generated near residual volume (RV) and total lung capacity (TLC).Beside, the measurement of lung functions was adapted by Quanjer (1983).The results showed: (a) PE max were significantly higher in elite weight lifters than those of untrained group (p<0.01). However,there was no significant differences in PI max between both groups; (b)there was no significantly positive liner relationships between maximal static respiratory pressures and three upper body tests in weight lifter group. In addition to PI max, the same results also showed in untrained group. Therefore, it suggested that expiratory muscle strength can be improved by weight lifting . In addition, respiratory muscle strength and upper body strength had linear relationships.
12
Chia-Hsin, Shih, and 石家欣. "Effect of glucosamine and chondroitin on weight lifters' exercise performance and cartilage metabolism." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/68073386807814148621.
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碩士<br>輔仁大學<br>營養科學系<br>95<br>Glucosamine and chondroitin are the key components of connective tissue. Many researchers were confirmed the effect of glucosamine and chondroitin on osteoarthritis patients’ cartilage growth and the advantage for syndrome releasing. Some of the investigators were challenged the above results recently. However, no studies focused on weight lifters who often get cartilage damage. This study was researched into the effect of glucosamine and chondroitin on weight lifters’ exercise performance and cartilage metabolism. Twenty-five weight lifters were separated into two groups (supplement group and placebo group) randomly and they took training everyday for 12 weeks. The supplement group took 1800 mg glucosamine and 900 mg chondroitin capsules and the placebo group took 2700 mg starch capsules per day. In physiology, we measure exercise performance by the Snatch and the Clean and Jerk. We used serum C-propeptide of type II procollagen (CPII) and cartilage oligomeric matrix protein (COMP) to measure cartilage metabolism. We also measured athletes’ pain situation by pain score. We carried out that both group had trend to increase the total amount of exercise performance and the amount of supplement group was higher than placebo group. Serum CPII concentrations between two groups were no significant difference on week 0 and week 12. But COMP concentration in supplement group was lower than placebo group. And there were no benefits on joint pain score in 0, 8 and 12 week. In conclusion, the supplementation of 1800 mg glucosamine and 900 mg chondroitin was no effect on weight lifters’ exercise performance, cartilage metabolism and pain situation for 12 weeks intervention.
13
Crowley, Jeffrey A. "The effects of three manipulated rest intervals on accentuated eccentric bench pressing." 2006. http://www.oregonpdf.org.
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14
陳柏揚. "The Kinematic Analysis of Elite College Weight Lifters’ Elbow Flexion During the Second Pull of Snatch." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/29340753677255075517.
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碩士<br>國立體育大學<br>教練研究所<br>95<br>Abstract
To improve the skills of the junior weightlifters, evaluating and depicting of the skill characteristics have become an important issue. Weightlifting, a sport with extreme loading, need to follow the rule of biomechanics and highly requires related physical skills. However, there were few weightlifting researches about biomechanics at the elbow joints and the shoulder joints in the past. Therefore, the purpose of this study is to evaluate the elbow flexion after the second pull in 3D kinematic analysis of elite college male weightlifters. 16 elite college weightlifters are involved in this study and 7 infrared cameras of Motion Analysis System at 120 Hz are used to capture the kinematic data during the second pull of snatching. The data are analyzed by Pearson’s product-moment correlation to derive the correlation coefficient between the angles of the shoulder joints and the elbow joints in the second pull. Besides, the correlation coefficient between the angles of the elbow joints and the horizontal offsets of the barbells is also calculated. The following are the results:
1. During the second pull, the angles of the participants’ shoulder joints continuously increase; the angles of the participants’ elbow joints increase first and then decrease.
2. During the second pull, the angle velocity of the participants’ shoulder joints continuously increases; in addition, the angle velocity of the participants’ elbow joints has two separate types: one is to continuously decrease and the other is to increase first and then to decrease.
3. During the second pull, the angles of shoulder joint and the elbow joint present the significant negative correlation for 18.8% participants.
4. During the second pull, the angles of elbow joint and horizontal offset of barbell present the significant positive and negative correlation for 25% and 75% participants respectively and no significant correlation for 1.3% participants. The angles of elbow joint and vertical offset of barbell present the significant positive and negative correlation for 31.3% and 68.8% participants respectively and no significant on 43.8% participants. It showed that the angular displacement of Elbow forθ2 is more important for horizontal offset of Barbell than k2.
15
Vongjaturapat, Naruepon. "Effect of false positive and false negative feedback on self-efficacy and performance of low and high self-esteem experienced weightlifters." Thesis, 1992. http://hdl.handle.net/1957/36883.
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The purpose of this study was to determine the effects of false positive and
false negative feedback upon the self-efficacy and performance of high and low
self-esteem experienced weight lifters. Among a group of volunteers, 65 experienced
male weight lifters were classified as either high or low self-esteem
following administration of the Global Self-Worth Scale (Neemann & Harter,
1986). Each was qualified by the ability to perform a one repetition-maximum
(1RM) bench press between 200 to 350 lbs., which was tested through a series of
trials. Self-efficacy estimates for the 1RM bench press were obtained throughout
the experiment. Trial sessions were accompanied by manipulated feedback,
providing the subjects with either actual, inflated, or deflated values of weights
lifted.
High and low self-esteem subjects performed tasks differently with respect
to the type of feedback received. During the first manipulative treatments, high
self-esteem subjects lifted greater weights after receiving false positive feedback
and lesser weights after receiving false negative feedback. At all times, low self
esteem subjects did not perform differently after the receipt of either false
positive or false negative feedback.
An analysis of the self-efficacy data demonstrated that predictions for
1RM bench press performances were not influenced by levels of self-esteem.
However, both high and low self-esteem subjects predicted that they would lift
greater or lesser weights following the administration of, false positive or false
negative feedback, respectively, and both groups of subjects predicted there
would be no weight differences following administration of actual feedback.
Correlation analyses, conducted to determine relationships between self-efficacy
and performance, indicated that during the first day of manipulative feedback
treatment there was a positive relationship between self-efficacy and subsequent
performance change. Previous performance change and subsequent self-efficacy
change were correlated only for high self-esteem subjects during day 2 of
the treatment. A regression analysis revealed that self-efficacy change was a
better predictor of subsequent performance change than previous performance
change.
In conclusion, false positive feedback increased self-efficacy and
performance of high self-esteem subjects. False negative feedback showed no
significant change for either low or high self-esteem subjects.<br>Graduation date: 1993
16
ZHANG, ZHI-PING, and 張志平. "The effects of the dietary manipulation on elite weight-lifters' and tennis players' body composition and biochemical profile." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/19668478820875921574.
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Drury, Kathryn A. "Cardiovascular adaptations to repeated valsalva manoeuvres in powerlifting athletes." Thesis, 2021. http://hdl.handle.net/1959.7/uws:63112.
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Powerlifters utilise a unique breathing pattern known as the Valsalva manoeuvre (VM) in order to help them move maximal loads. This pattern of breathing is thought to impact a powerlifter’s cardiac morphology; however, the functional consequences of this are still unknown. The VM has profound implications for the cardiovascular system, with heart rate and blood pressure demonstrating four phases of reciprocal behaviour. This study proposed that there may be observable differences in the cardiovascular response to the VM when comparing powerlifters to those who are Valsalva-naïve. It was also speculated that changes in the expiratory pressure of the VM may influence the cardiovascular response. The final question was whether any of the differences observed were dependent on sex. This study found that there were statistically significant differences in the heart rate and blood pressure response exhibited by powerlifters when compared to sedentary controls. For instance, the blood pressure change in Phase I of the VM was 28mmHg in powerlifters compared to 15mmHg in sedentary (p <0.05). There were also significant differences in the cardiovascular response of all participants when performing the VM at varying intensities of expiratory pressure. For example, the VM Phase II heart rate changed by 40 ± 25 beats.min-1 during a protocol at fifty percent of maximum expiratory pressure, which was significantly (p <0.05) greater than the heart rate change observed during the protocol at thirty percent of maximum expiratory pressure (25 ± 14 beats.min-1). However, none of the differences observed which resulted from training status or intensity were dependent on sex. The findings of this study suggest that within the VM’s inherent cardiovascular pattern, heart rate and blood pressure respond to training and intensity in a way that is similar to other contexts of isometric exercise. This thesis contributes to the understanding of cardiovascular functional differences in powerlifters. This thesis also provides new insight into VM methodology, which may be applicable to other settings of VM utilisation. Finally, this work provides knowledge about female physiology in exercise science, an area which is currently lacking.
18
Hsiao-Ching, Hsiao, and 蕭筱青. "Development of a Computer Aided Nutrition Care System for Weight-lifter Athletes." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/82379770900645841008.
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碩士<br>國立體育學院<br>運動科學研究所<br>88<br>This study is to develop a computer aided sports nutrition care system, providing nutrition assessment and nutrition support for weight-lifter athletes. The system can assess nutritional status and give athletes sports nutrition education. We use Authorware to develop the system, and use Datagrip to link the database. The system consists of one database and two modules: nutritional assessment and nutritional education. The database can record athletes’ subjective and objective information, and nutritional assessment module simulate human experts’ reasoning process in making appropriate advice for sports nutritional care. The nutritional education module can provide suitable nutrition education knowledge for athletes and students. This system can be used as learning tool, and be used in assessment and nutrition support. It can also improve the efficiency of nutritional consult, give an example of developing computer aided nutrition care system for athletes, and help to develop the elite athletes database for further study.
19
Wang, Huang-Kai, and 王皇凱. "Study on Trunk Muscle Power and Joint Range of Motion in Weight Lifter Athletes and General College Students." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/10745089587410527606.
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碩士<br>國立體育大學<br>運動保健學系碩士班<br>98<br>The purpose of this study was to investigate the difference between trunk muscle power and joint range of motion in weight lifter athletes and general college students. Fifteen weight lifter athletes who studying in the department of sports training science-athletics in NTSU and twenty-nine general college students who studying in the department of athletic training and health in NTSU, were recruited as subjects. All of the subjects are male, the average age of weight lifter athletes is 19.71±1.14y/o, average height: 171.07±5.71cm, average weight: 88.07±19.54kg. Furthermore, the average age of general college students is 20.21±1.11y/o, average height: 173.86±5.68cm, average weight: 70.17±8.44kg. Physical examination measures included trunk muscle power (abdominal isometric and dynamic muscular endurance, back muscle isometric and dynamic muscular endurance, trunk muscle stability, and side bridge) and joint range of motion (passive hip flexion and extension, active lumbar flexion, extension, lateral bending and rotation). The data were analyzed by independent-t test, p=.05. The results showed that weight lifter athletes had greater quadratus lumborum isometric muscular endurance than general college students, but there was no significant difference even less than general college students in other trunk muscle power measures. Weight lifter athletes had greater passive hip extension than general college students, but there was no significant difference even less than general college students in other joint range of motion measures. The conclusion of this study was weight lifter athletes had no better than general college students in trunk muscle power and joint range of motion. We suggest that weight lifter training not only focus on special training but also put more attention in trunk muscle power and flexibility to avoid injuring, and then improving sport achievement in the future.