Muscle strength

2013 ◽  
Author(s):  
Mark B. A. De Ste Croix
Keyword(s):  
Body Composition ◽  
Muscle Strength ◽  
Strength Test ◽  
Muscle Size ◽  
Strength Development ◽  
Strength Testing ◽  
Factors Associated ◽  
Rate Of Recovery ◽  
Over Time ◽  
Age And Sex

Despite a relatively limited understanding of the factors associated with strength development, advances in equipment, and increased understanding of growth and maturation issues, have provided new insights into paediatric muscle strength development. Strength testing of children is performed routinely by researchers to monitor the determinants and development of strength throughout childhood, and also by physiotherapists to assess the degree of muscle disability and to diagnose the rate of recovery. It is important for strength test administrators to be equipped with knowledge of the normal age and sex-associated variations in strength and the factors attributable to that variation. Over time, the use of differing techniques to adjust for body size has changed our perspective of the historical concept of the age- and sex-associated differences in muscle strength. Likewise, the development of more sophisticated techniques to determine muscle size and body composition has allowed researchers to explore the factors associated with the development of strength during growth with a greater degree of validity.

scholarly journals Handgrip strength and muscle fatigue among footwear industry workers

2016 ◽  
Vol 29 (2) ◽  
pp. 317-324 ◽  
Author(s):  
Lidiane Angélica Cotelez ◽  
Maysa Venturoso Gongora Buckeridge Serra ◽  
Eliane Ramos ◽  
José Eduardo Zaia ◽  
Flávia Oliveira Toledo ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Muscle Fatigue ◽  
Handgrip Strength ◽  
Strength Test ◽  
Strength Testing ◽  
Test Results ◽  
Irreversible Damage ◽  
Low Correlation ◽  
Footwear Industry ◽  
The Mean

Abstract Introduction: Muscle fatigue can be defined as a decrease in the performance of the neuromuscular system in generating force. This situation is considered a complex physiological process involving various body systems, in order to avoid irreversible damage or even cell death. Objective: The aim of this study was to measure muscle strength in order to assess the level of fatigue among footwear industry workers, and to determine a possible correlation between muscle strength and the perception of reported fatigue. Materials and Methods: The study included 32 male workers from the footwear industry with a mean age of 34.63 ± 11.98 years. The workers performed the handgrip strength test using a handheld dynamometer, and completed the Bipolar Fatigue Questionnaire. Results: The mean result of strength testing was 23.1 ± 8.3 kgf, and the mean score of the fatigue questionnaire was 2.28 ± 0.93 points. However, a low correlation was observed between the results of the fatigue questionnaire and the strength test results. Conclusion: The grip strength results of the footwear workers were below the values for the general Brazilian population, a fact that may indicate potential muscle fatigue. However, a low correlation with the perception of fatigue was indicated by the questionnaire.

Research of Isokinetic Test on the Strength of Shoulder Joint of Elite Female Water Polo Athletes

2015 ◽  
Vol 713-715 ◽  
pp. 598-601
Author(s):  
Xiao Yong Wang
Keyword(s):  
Muscle Strength ◽  
The United States ◽  
Strength Test ◽  
Strength Testing ◽  
Isokinetic Exercise ◽  
Muscle Testing ◽  
Isokinetic Test ◽  
Isokinetic Muscle Strength ◽  
The World ◽  
And Training

Study Objective:The concept of isokinetic exercise was first proposed by Hislop and Perrine. Cybex Company of the United States created the first isokinetic muscle strength training instrument in the early 1970 s, after then many countries in the world has begun the application and research of the isokinetic muscle testing, and all acknowledged that it is a major innovation in the field of muscle strength testing and training. The isokinetic muscle strength test can evaluate the muscle characteristics under different contracting such as contraction centripetal and centrifugal contraction.

Treatment with oxandrolone and the durability of effects in older men

2004 ◽  
Vol 96 (3) ◽  
pp. 1055-1062 ◽  
Author(s):  
E. Todd Schroeder ◽  
Ling Zheng ◽  
Kevin E. Yarasheski ◽  
Dajun Qian ◽  
Yolanda Stewart ◽  
...  
Keyword(s):  
Body Composition ◽  
Muscle Strength ◽  
Muscle Size ◽  
Thigh Muscle ◽  
Whole Body ◽  
Muscle Area ◽  
Leg Flexion ◽  
Anabolic Androgen ◽  
Total Body ◽  
Proximal Thigh

We investigated the effects of the anabolic androgen, oxandrolone, on lean body mass (LBM), muscle size, fat, and maximum voluntary muscle strength, and we determined the durability of effects after treatment was stopped. Thirty-two healthy 60- to 87-yr-old men were randomized to receive 20 mg oxandrolone/day ( n = 20) or placebo ( n = 12) for 12 wk. Body composition [dual-energy X-ray absorptiometry (DEXA), magnetic resonance imaging, and 2H2O dilution] and muscle strength [1 repetition maximum (1 RM)] were evaluated at baseline and after 12 wk of treatment; body composition (DEXA) and 1-RM strength were then assessed 12 wk after treatment was discontinued ( week 24). At week 12, oxandrolone increased LBM by 3.0 ± 1.5 kg ( P < 0.001), total body water by 2.9 ± 3.7 kg ( P = 0.002), and proximal thigh muscle area by 12.4 ± 8.4 cm2 ( P < 0.001); these increases were greater ( P < 0.003) than in the placebo group. Oxandrolone increased 1-RM strength for leg press by 6.7 ± 6.4% ( P < 0.001), leg flexion by 7.0 ± 7.8% ( P < 0.001), chest press by 9.3 ± 6.7% ( P < 0.001), and latissimus pull-down exercises by 5.1 ± 9.1% ( P = 0.02); these increases were greater than placebo. Oxandrolone reduced total (-1.9 ± 1.0 kg) and trunk fat (-1.3 ± 0.6 kg; P < 0.001), and these decreases were greater ( P < 0.001) than placebo. Twelve weeks after oxandrolone was discontinued ( week 24), the increments in LBM and muscle strength were no longer different from baseline ( P > 0.15). However, the decreases in total and trunk fat were sustained (-1.5 ± 1.8, P = 0.001 and -1.0 ± 1.1 kg, P < 0.001, respectively). Thus oxandrolone induced short-term improvements in LBM, muscle area, and strength, while reducing whole body and trunk adiposity. Anabolic improvements were lost 12 wk after discontinuing oxandrolone, whereas improvements in fat mass were largely sustained.

Isometric Strength Test Consistency over Time

1983 ◽  
Vol 27 (9) ◽  
pp. 790-793
Author(s):  
Terrence J. Stobbe ◽  
Ralph W. Plummer ◽  
Donald P. Shreves
Keyword(s):  
Financial Burden ◽  
Strength Test ◽  
Isometric Strength ◽  
Strength Testing ◽  
Test Results ◽  
Testing Protocol ◽  
Strength Tests ◽  
Test Population ◽  
Student Volunteer ◽  
Over Time

Workmen's Compensation costs have become a major financial burden on industry. A significant part of these costs are the result of musculoskeletal injuries. One method of controlling these injuries is matching employees to jobs based on strength. Isometric strength testing has been shown to be an effective method of matching employee strength capability to job strength requirements. The use of screening test raises the question of test-retest consistency. This study was designed to determine the consistency of isometric strength test results over time. Thirteen student volunteer subjects (10m, 3F) participated in a testing protocol consisting of five strength tests performed a minimum of two times each at two week intervals. Four test sessions were held. An analysis of variance was used to identify week to week strength differences in the test population. Each of the five tests was analyzed separately and no significant week to week strength differences were found. This result further supports the validity of using isometric strength testing as a selection tool.

Isometric strength test consistency over time

1983 ◽  
Author(s):  
Terrence J. Stobbe ◽  
Ralph W. Plummer ◽  
Donald P. Shreves
Keyword(s):  
Strength Test ◽  
Isometric Strength ◽  
Over Time

scholarly journals Factors associated with professional identity formation within psychiatry residency training: A longitudinal study

2021 ◽  
Author(s):  
Qian Hui Chew ◽  
Yvonne Steinert ◽  
Kang Sim
Keyword(s):  
Professional Identity ◽  
Identity Formation ◽  
Psychiatry Residency ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Developmental Stages ◽  
Rate Of Change ◽  
Psychiatry Residents ◽  
Factors Associated ◽  
Over Time

Abstract Introduction Conceptual frameworks for professional identity (PI) formation highlight the importance of developmental stages and socialization as the learner progresses from legitimate peripheral to full participation. Based on extant literature and clinical impressions, the authors aimed to explore factors associated with PI formation in psychiatry residents over time, and hypothesized that time in training, seniority status, and duration of exposure to psychiatry prior to residency would be associated with PI formation. Methods Eighty out of 96 psychiatry residents (response rate, 83.3%) from the National Psychiatry Residency Program in Singapore participated and rated their PI development using the Professional Self Identity Questionnaire (PSIQ) across four timepoints from January 2016–December 2019. The residents were classified as junior (first 3 years) or senior residents (years 4–5). Linear mixed model analyses were conducted, with time in training, seniority status (junior versus senior residents), duration of psychiatry postings prior to residency, and their interaction as associated factors with PI over time. Results Time in training, seniority, and duration of psychiatry postings before residency (all p < 0.01) were significantly associated with higher PSIQ scores at baseline. Over time, although all residents had increases in PSIQ scores, this rate of change did not differ significantly between junior and senior residents. Discussion Exposure to psychiatry postings before residency, time in learning, and seniority are factors which influence PI development in residents. This has implications for psychiatry residency selection and training, adequate clinical exposure during training rotations, and continual support for new and senior residents to foster PI formation over time.

Sign in / Sign up

Export Citation Format

Share Document