Effects of Posture on Back Strength and Lifting Capacity

1986 ◽  
Vol 30 (3) ◽  
pp. 234-238
Author(s):  
Sean Gallagher ◽  
Thomas G. Bobick
Keyword(s):  
Body Weight ◽  
Pilot Study ◽  
Peak Torque ◽  
Healthy Male ◽  
Strength Tests ◽  
Lifting Capacity ◽  
Subjective Estimates ◽  
Stooped Posture ◽  
Male Subjects

The Bureau of Mines performed a pilot study examining the effects of posture on back strength and Maximum Acceptable Weight of Lift (MAWL) on six healthy male subjects (M = 32 years ± 4 SD). Six back strength measurements (3 static and 3 dynamic) were made while the subjects were kneeling and standing. In addition, these subjects (who were unaccustomed to lifting in these postures) volunteered to participate in a study of psychophysically determined MAWL in both postures. Results of the back strength tests showed a significantly lower peak torque per body weight output in kneeling versus standing back strength measurements for five out of six test comparisons (p < .05). Subjective estimates of lifting capacity in the kneeling posture were significantly lower than those for the stooped posture (p < .05). The results of tests of back strength and lifting capacity in these two postures provide useful information to consider in determining the physiological and psychophysical stresses imposed by these work postures.

Isokinetic Strength Profiles of Thigh Muscles of Modern Dancers in Relation to Their Experience Level

2013 ◽  
Vol 28 (3) ◽  
pp. 137-144
Author(s):  
Ani Agopyan ◽  
Demet Tekin ◽  
Mehmet Unal ◽  
Hizir Kurtel ◽  
Gullu Turan ◽  
...  
Keyword(s):  
Body Weight ◽  
Peak Torque ◽  
Thigh Muscle ◽  
Isokinetic Strength ◽  
Total Work ◽  
Isokinetic Dynamometer ◽  
Experience Level ◽  
Strength Tests ◽  
Angular Velocities ◽  
Modern Dancers

The aim of this study was to determine maximal voluntary peak torque (PT), PT% body weight (PT%BW), total work (TW), and hamstring/quadriceps ratio (HQR) for bilateral and unilateral thigh muscle strength during isokinetic muscle contractions in modern dancers in relation to their experience level. METHODS: Twenty-two female dancers were divided into two groups: intermediate dancers (ID, n=11) and advanced dancers (AD, n=11). Strength tests were performed using the Biodex System-III Pro Multijoint System isokinetic dynamometer to determine three joint angular velocities (60, 180, 300°/s). RESULTS: During extension, ADs exhibited higher ratios in the HQR (p=0.016) on right leg at 300°/s, IDs generated greater TW (p=0.042), and within groups, there was a significant left-to-right difference in the HQR at 300°/s for ADs (p=0.042). During flexion, within groups, the ADs exhibited significant differences between legs for both PT (p=0.026) and PT%BW (p=0.022) at 300°/s. CONCLUSION: For both groups, the average HQR in all angular velocities was not within the recommended range, which is required to prevent injuries; at the same time, unilateral muscular imbalances existed. Lower extremities of ADs exhibited asymmetric strength patterns at a certain level. Further research should be done to confirm the findings of this pilot study.

scholarly journals Comparison of Muscle Onset Activation Sequences between a Golf or Tennis Swing and Common Training Exercises Using Surface Electromyography: A Pilot Study

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
John M. Vasudevan ◽  
Andrew Logan ◽  
Rebecca Shultz ◽  
Jeffrey J. Koval ◽  
Eugene Y. Roh ◽  
...  
Keyword(s):  
Pilot Study ◽  
Surface Electromyography ◽  
Muscle Activation ◽  
Turning Point ◽  
Positive Association ◽  
Spearman Correlation ◽  
Healthy Male ◽  
Training Exercises ◽  
Male Subjects ◽  
Activation Sequence

Aim. The purpose of this pilot study is to use surface electromyography to determine an individual athlete’s typical muscle onset activation sequence when performing a golf or tennis forward swing and to use the method to assess to what degree the sequence is reproduced with common conditioning exercises and a machine designed for this purpose.Methods. Data for 18 healthy male subjects were collected for 15 muscles of the trunk and lower extremities. Data were filtered and processed to determine the average onset of muscle activation for each motion. A Spearman correlation estimated congruence of activation order between the swing and each exercise. Correlations of each group were pooled with 95% confidence intervals using a random effects meta-analytic strategy.Results. The averaged sequences differed among each athlete tested, but pooled correlations demonstrated a positive association between each exercise and the participants’ natural muscle onset activation sequence.Conclusion. The selected training exercises and Turning Point™device all partially reproduced our athletes’ averaged muscle onset activation sequences for both sports. The results support consideration of a larger, adequately powered study using this method to quantify to what degree each of the selected exercises is appropriate for use in both golf and tennis.

Food acceptability affects ghrelin and insulin levels in healthy male subjects. A pilot study

2018 ◽  
Vol 49 ◽  
pp. 48-55 ◽  
Author(s):  
Ammar Olabi ◽  
Nahla Hwalla ◽  
Hamza Daroub ◽  
Omar Obeid ◽  
Christelle Cordahi
Keyword(s):  
Pilot Study ◽  
Healthy Male ◽  
Insulin Levels ◽  
Male Subjects

Pharmacokinetics of Dopamine in Healthy Male Subjects

2000 ◽  
Vol 92 (2) ◽  
pp. 338-338 ◽  
Author(s):  
Drew A. MacGregor ◽  
Timothy E. Smith ◽  
Richard C. Prielipp ◽  
John F. Butterworth ◽  
Robert L. James ◽  
...  
Keyword(s):  
Body Weight ◽  
Washout Period ◽  
Pharmacokinetic Model ◽  
Plasma Concentrations ◽  
Healthy Male ◽  
Blood Concentrations ◽  
Homogeneous Population ◽  
Dopamine Infusion ◽  
Arterial Blood ◽  
Male Subjects

Background Dopamine is an agonist of alpha, beta, and dopaminergic receptors with varying hemodynamic effects depending on the dose of drug being administered. The purpose of this study was to measure plasma concentrations of dopamine in a homogeneous group of healthy male subjects to develop a pharmacokinetic model for the drug. Our hypothesis was that dopamine concentrations can be predicted from the infusion dose using a population-based pharmacokinetic model. Methods Nine healthy male volunteers aged 23 to 45 yr were studied in a clinical research facility within our academic medical center. After placement of venous and arterial catheters, dopamine was infused at 10 microg x kg(-1) x min(-1) for 10 min, followed by a 30-min washout period. Subsequently, dopamine was infused at 3 microg x kg(-1) x min(-1) for 90 min, followed by another 30-min washout period. Timed arterial blood samples were centrifuged, and the plasma was analyzed by high-performance liquid chromatography. Mixed-effects pharmacokinetic models using NONMEM software (NONMEM Project Group, University of California, San Francisco, CA) were used to determine the optimal compartmental pharmacokinetic model for dopamine. Results Plasma concentrations of dopamine varied from 12,300 to 201,500 ng/l after 10 min of dopamine infusion at 10 microg x kg(-1) x min(-1). Similarly, steady-state dopamine concentrations varied from 1,880 to 18,300 ng/l in these same subjects receiving 3-microg x kg(-1) x min(-1) infusions for 90 min. A two-compartment model adjusted for body weight was the best model based on the Schwartz-Bayesian criterion. Conclusions Despite a homogeneous population of healthy male subjects and weight-based dosing, there was 10- to 75-fold intersubject variability in plasma dopamine concentrations, making standard pharmacokinetic modeling of less utility than for other drugs. The data suggest marked intraindividual and interindividual variability in dopamine distribution and/or metabolism. Thus, plasma dopamine concentrations in patients receiving dopamine infusion at identical rates may vary profoundly. Our data suggest that dosing dopamine based on body weight does not yield predictable blood concentrations.

Main force directions of trunk muscles: A pilot study in healthy male subjects

2018 ◽  
Vol 60 ◽  
pp. 214-224 ◽  
Author(s):  
Christoph Anders ◽  
Beatrice Steiniger
Keyword(s):  
Pilot Study ◽  
Trunk Muscles ◽  
Healthy Male ◽  
Male Subjects

scholarly journals Influence of age, body mass index and waist-hip ratio on the human spine; a radiographic study of adult male subjects in Port Harcourt-Nigeria

2021 ◽  
Vol 8 (2) ◽  
pp. 001-007
Author(s):  
Micheal Omonnkheoa Oyakhire ◽  
Loveday Ese Oghenemavwe ◽  
Chukuemeka Emmanuel Agi
Keyword(s):  
Body Mass Index ◽  
Body Weight ◽  
Body Mass ◽  
The Body ◽  
Radiographic Study ◽  
Healthy Male ◽  
Average Value ◽  
Waist Hip Ratio ◽  
Port Harcourt ◽  
Male Subjects

The study determined the Lumbosacral angle (LSA) of male subjects and evaluated its relationship to age, BMI and Waist -Hip ratio. Lateral radiographs of one hundred and forty-two informed healthy male volunteers between the age of 18-60 were studied using Ferguson’s method, and analyzed with respect to age, waist hip ratio (WHR) and body mass index (BMI).. The result showed the average value for Lumbosacral angle was 34.060 ± 0.560, the body weight was 70.34 ± 1.02Kg, and BMI was 24. 64 ± 0.38Kgm-2. Angle values were observed to increase with age up to 32years, followed by a sinusoidal increase and decrease pattern thereafter. Significant correlations were observed between LSA and Body weight as well as between LSA and BMI (p<0.05). The Lumbosacral angle of males in Port-Harcourt, South South Nigeria is within the range of literature derived measurement values world-wide, but lower than the average reported from previous studies on other Nigerian populations.

scholarly journals Ten minutes endurance test at 50% upper body weight: a pilot study in healthy controls and physically active people

2021 ◽  
Author(s):  
Christoph Anders ◽  
Tim Schönau
Keyword(s):  
Body Weight ◽  
Pilot Study ◽  
Perceived Exertion ◽  
Statistical Significance ◽  
Upper Body ◽  
Healthy Controls ◽  
Endurance Test ◽  
Physically Active ◽  
Competition Level ◽  
Male Subjects

Abstract ObjectiveIntense endurance and strength training mark virtually opposite parts of basic motor skills. Extreme high load physical demands are getting sparer but endurance demands are still present. Therefore, healthy controls and endurance and strength trained athletes at competition level were exposed to a submaximal endurance test of their back muscles.In this pilot study 38 healthy male subjects participated: physically inactive controls (C, n=12), endurance trained (ET, n=13), and strength trained subjects (ST, n=13). All participants were asked to finish a ten minutes back muscle endurance test at 50% of their upper body weight. ResultsMaximum holding times were shortest in the ST group (469±142 s; ET 600±0 s; C 600±0 s), but statistical significance could only be proven for ET vs. ST (p<0.01). Hedges gs values for comparisons of maximum holding times showed relevant differences among all groups: ET vs. ST 10.64; ET vs. C 2.38; ST vs. C 0.78. Values of perceived exertion increased over time with lowest values for the ET group, except after the first minute. Especially between 180s and 420s ST group showed highest exertion values, but between group differences could not be determined.

Strength Values of Shoulder Internal and External Rotators in Elite Volleyball Players

2006 ◽  
Vol 15 (3) ◽  
pp. 236-245 ◽  
Author(s):  
Robert van Cingel ◽  
Gertjan Kleinrensink ◽  
Rob Stoeckart ◽  
Geert Aufdemkampe ◽  
Rob de Bie ◽  
...  
Keyword(s):  
Body Weight ◽  
Confidence Intervals ◽  
Peak Torque ◽  
Shoulder Injuries ◽  
Isokinetic Dynamometry ◽  
Type Design ◽  
Strength Tests ◽  
Volleyball Players ◽  
Transversal Study

Objective:To determine concentric shoulder external-internal rotator strength, dominant and non-dominant shoulder differences and agonist/antagonist ratios.Design:A transversal study of isokinetic dynamometry of healthy shoulders, 95% confidence intervals are presented.Participants:35 asymptomatic elite, male volleyball players.Measurements:Peak torque normalized for body weight was recorded at 60, 180, and 300°/sec. with a Cybex 6000 dynamometer.Results:(1) internal rotators were significantly stronger than external rotators of the same shoulder; (2) internal rotators of the dominant arm were significantly stronger than of the non-dominant arm; (3) no difference existed between external rotators of the dominant and the non-dominant arm; (4) external–internal rotator ratios of the dominant arm were significantly lower than of the non-dominant arm; and (5) no differences were found between the ratios of each arm separately.Conclusions:Data presented are important for interpreting isokinetic shoulder rotator strength tests in elite volleyball players and could be relevant in rehabilitation and prevention of shoulder injuries.

scholarly journals ABDOMINAL/ADDUCTOR STRENGTH IMBALANCE IN SOCCER PLAYERS WITH OSTEITIS PUBIS

2018 ◽  
Vol 14 (3) ◽  
pp. e33-e40
Author(s):  
Walaa S. Mohammad ◽  
Walaa M. Elsais
Keyword(s):  
Body Weight ◽  
Eccentric Contraction ◽  
Peak Torque ◽  
Soccer Players ◽  
Healthy Male ◽  
Control Groups ◽  
Osteitis Pubis ◽  
Muscle Imbalance ◽  
Adductor Muscles ◽  
Healthy Control

Background and Objective The muscle imbalance between abdominal and hip adductor muscles as an etiology for osteitis pubis is not well understood. The concept of a relationship between eccentric/concentric ratios at the pelvis and osteitis pubis in athletes is limited. This study aimed to compare the eccentric/concentric ratios for abdominal/adductor, abdominal/back, and hip adductor muscles as well as eccentric abdominal/eccentric adductor muscles in soccer players suffering from osteitis pubis with those in healthy athletes. Material and Methods Twenty male soccer athletes with osteitis pubis were recruited to participate and 20 healthy male soccer athletes were recruited to participate. Peak torque/body weight (PT/BW) for the hip adductor, abdominal, and back muscles during isokinetic concentric and eccentric contraction modes at a speed of 180°/s was recorded for healthy players and soccer athletes with osteitis pubis. Eccentric/concentric ratios for the abdominal/adductor, abdominal/back, and hip adductor muscles and the eccentric abdominal/eccentric adductor muscles were measured for both groups. Results There was a significant decrease in the eccentric abdominal/concentric hip adductor muscles ratio (p = 0.000) and in the eccentric/concentric hip adductor muscles ratio (p = 0.016) between the osteitis pubis and the healthy control groups. Conclusion Soccer players with osteitis pubis present with strength imbalance. The osteitis pubis group displayed eccentric weakness of the abdominal and adductor muscles, resulting in imbalances in the normal eccentric abdominal/concentric adductor and eccentric/concentric adductor ratios. Therefore, exercises that increase the eccentric strength of abdominal and hip adductor muscles may be beneficial to include in rehabilitation programmes of patients with osteitis pubis.

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