Development of a new isometric strength test using an isoinertial-based weight machine

2010 ◽  
Vol 12 (2) ◽  
pp. 81-86 ◽  
Author(s):  
Jesper Augustsson ◽  
Magnus Bruno ◽  
Joakim Swärd
Keyword(s):  
Strength Test ◽  
Isometric Strength

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

The Minimum Number of Attempts for a Reliable Isometric Strength Test Score

2019 ◽  
Vol 2 (1) ◽  
pp. 89-95 ◽  
Author(s):  
Sunggun Jeon ◽  
William M. Miller ◽  
Minsoo Kang ◽  
Xin Ye
Keyword(s):  
Test Score ◽  
Strength Test ◽  
Isometric Strength ◽  
Minimum Number

scholarly journals The Athletic Shoulder (ASH) test: reliability of a novel upper body isometric strength test in elite rugby players

2018 ◽  
Vol 4 (1) ◽  
pp. e000365 ◽  
Author(s):  
Ben Ashworth ◽  
Patrick Hogben ◽  
Navraj Singh ◽  
Laura Tulloch ◽  
Daniel D Cohen
Keyword(s):  
Injury Risk ◽  
Shoulder Girdle ◽  
Strength Test ◽  
Isometric Strength ◽  
Test Reliability ◽  
Upper Body ◽  
Minimal Detectable Change ◽  
Detectable Change ◽  
Minimum Detectable Change ◽  
Rugby Players

ObjectivesLower limb isometric tests are used to assess strength and strength asymmetries and monitor reductions in muscle force that may contribute to loss of performance and increase injury risk. Isometric tests in the upper body may be appropriate to monitor neuromuscular performance of the shoulder joint in sports involving contact and overhead actions. The aim of this study was to determine the reliability of a novel upper body isometric strength test.MethodsEighteen elite rugby players (age 22.4±4.6 years; body mass 95.5±13.4 kg) were tested on consecutive days. Maximal isometric contractions using both limbs against a force platform were assessed at three angles of abduction (180°, ‘I’; 135°, ‘Y’ and 90°, ‘T’), in a prone lying position. To evaluate interday reliability, intraclass coefficients (ICC) were calculated for mean net peak force (NPF) and highest NPF achieved in any trial (peak NPF). Intratrial variability was assessed using coefficient of variation (CV), and the standard error of measurement (SEM) was used to calculate minimal detectable change (MDC).ResultsInterday reliability for NPF was excellent in all test positions (ICC 0.94–0.98). The test demonstrated high absolute reliability values (SEM 4.8–10.8) and interday measurement error was below 10% in all test positions (CV 5.0–9.9%) except for the non-dominant arm I-position (CV 11.3%). Minimum detectable change was between 13.2 and 25.9 N.ConclusionThe Athletic Shoulder test demonstrated excellent reliability for each test position supporting its use as a reliable tool to quantify the ability to produce and transfer force across the shoulder girdle.

scholarly journals Knee Angle Affects Posterior Chain Muscle Activation During an Isometric Test Used in Soccer Players

Sports ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 13 ◽  
Author(s):  
Paul James Read ◽  
Anthony Nicholas Turner ◽  
Richard Clarke ◽  
Samuel Applebee ◽  
Jonathan Hughes
Keyword(s):  
Muscle Activation ◽  
Gluteus Maximus ◽  
Biceps Femoris ◽  
Strength Test ◽  
Isometric Strength ◽  
Medial Gastrocnemius ◽  
Soccer Players ◽  
Emg Activity ◽  
Hamstring Muscle ◽  
Knee Angle

Background: It has been suggested that altering the knee flexion angle during a commonly used supine isometric strength test developed with professional soccer players changes preferential hamstring muscle recruitment. The aim of this study was to examine the electromyography (EMG) knee joint-angle relationship during this test, as these data are currently unknown. Methods: Ten recreational male soccer athletes (age: 28 ± 2.4 years) were recruited and performed a supine isometric strength test on their dominant leg with the knee placed at two pre-selected flexion angles (30° and 90°). The surface EMG of the gluteus maximus, biceps femoris, semitendinosus, and medial gastrocnemius was measured, in addition to the within-session reliability (intraclass correlation coefficient (ICC) and coefficient of variation (CV)). Results: Within-session reliability showed large variation dependent upon the test position and muscle measured (CV% = 8.8–36.1) Absolute mean EMG activity and percentage of maximum voluntary isometric contraction (MVIC) indicated different magnitudes of activation between the two test positions; however, significant mean differences were present for the biceps femoris only with greater activation recorded at the 30° knee angle (% MVIC: 31 ± 9 vs. 22 ± 7; p = 0.002). These differences (30% mean difference) were greater than the observed typical measurement error (CV% = 13.1–14.3 for the 90° and 30° test positions, respectively). Furthermore, the percentage MVIC showed a trend of heightened activation of all muscles with the knee positioned at 30°, but there was also more within-subject variation, and this was more pronounced for the gluteus maximus (CV% = 36.1 vs. 19.8) and medial gastrocnemius (CV% 31 vs. 22.6). Conclusions: These results indicate that biceps femoris and overall posterior chain muscle activation is increased with the knee positioned at 30° of flexion; however, the 90° angle displayed less variation in performance within individual participants, especially in the gluteus maximus and medial gastrocnemius. Thus, practitioners using this test to assess hamstring muscle strength should ensure appropriate familiarisation is afforded, and then may wish to prioritise the 30° knee position.

Validity of Isometric Strength Tests for Predicting Performance in Physically Demanding Tasks

1984 ◽  
Vol 28 (5) ◽  
pp. 452-454 ◽  
Author(s):  
Andrew S. Jackson ◽  
H. G. Osburn ◽  
Kenneth R. Laughery
Keyword(s):  
Coal Mining ◽  
Job Analysis ◽  
Strength Test ◽  
Isometric Strength ◽  
Energy Industry ◽  
Work Sample ◽  
Male And Female ◽  
Predicting Performance ◽  
Strength Tests ◽  
Highly Correlated

Job analysis has shown that many tasks in the energy industry are physically demanding. This study examined the validity of an isometric strength test battery for predicting performance in work sample tests that simulated physically demanding tasks in coal mining and oil production. Since two of the work sample tests involved an endurance component, metabolically determined VO(2) (L/Min) was used to measure arm endurance. All tests were administered to 25 male and 25 female physically fit subjects. Correlations between the isometric strength tests and the work sample tests ranged from .67 to .93. In addition, the isometric strength tests were more highly correlated with the endurance work sample tests than metabolically measured arm endurance. Slopes and intercepts of the male and female regression lines were homogeneous. These results support the validity of isometric strength tests for predicting performance in physically demanding jobs.

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.

scholarly journals Reliability of Shoulder Rotators Isometric Strength Test using a Novel Pulley Electromechanical Dynamometer. Influence of the Assessment Position

2018 ◽  
Vol 9 (2) ◽  
Author(s):  
Claudio Chamorro ◽  
Carlos De La Fuente ◽  
Daniel Jerez ◽  
Christian Campos ◽  
Luis Javier Chirosa
Keyword(s):  
Strength Test ◽  
Isometric Strength

A Review on Utilization of Fly- Ash and Pond-Ash as a Partial Replacement of Cement in Concrete Mix Design

2018 ◽  
pp. 413-418
Author(s):  
Harshkumar Patel ◽  
Yogesh Patel
Keyword(s):  
Fly Ash ◽  
Electricity Generation ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Thermal Power ◽  
Strength Test ◽  
Partial Replacement ◽  
Pond Ash ◽  
Research Activities ◽  
Ash Disposal

Now-a-days energy planners are aiming to increase the use of renewable energy sources and nuclear to meet the electricity generation. But till now coal-based power plants are the major source of electricity generation. Disadvantages of coal-based thermal power plants is disposal problem of fly ash and pond ash. It was earlier considered as a total waste and environmental hazard thus its use was limited, but now its useful properties have been known as raw material for various application in construction field. Fly ash from the thermal plants is available in large quantities in fine and coarse form. Fine fly ash is used in construction industry in some amount and coarse fly ash is subsequently disposed over land in slurry forms. In India around 180 MT fly is produced and only around 45% of that is being utilized in different sectors. Balance fly ash is being disposed over land. It needs one acre of land for ash disposal to produce 1MW electricity from coal. Fly ash and pond ash utilization helps to reduce the consumption of natural resources. The fly ash became available in coal based thermal power station in the year 1930 in USA. For its gainful utilization, scientist started research activities and in the year 1937, R.E. Davis and his associates at university of California published research details on use of fly ash in cement concrete. This research had laid foundation for its specification, testing & usages. This study reports the potential use of pond-ash and fly-ash as cement in concrete mixes. In this present study of concrete produced using fly ash, pond ash and OPC 53 grade will be carried. An attempt will be made to investigate characteristics of OPC concrete with combined fly ash and pond ash mixed concrete for Compressive Strength test, Split Tensile Strength test, Flexural Strength test and Durability tests. This paper deals with the review of literature for fly-ash and pond-ash as partial replacement of cement in concrete.

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