Validity and Reliability of the Load-Velocity Relationship to Predict the One-Repetition Maximum in Deadlift

2018 ◽  
Vol 32 (3) ◽  
pp. 681-689 ◽  
Author(s):  
Ludwig Ruf ◽  
Clément Chéry ◽  
Kristie-Lee Taylor
Keyword(s):  
Validity And Reliability ◽  
Repetition Maximum ◽  
Velocity Relationship ◽  
The One

scholarly journals Concurrent Validity and Reliability of the Load-Velocity Relationship to Predict the One-Repetition Maximum during Three Weightlifting Derivatives

Kinesiology ◽  
2021 ◽  
Vol 53 (2) ◽  
pp. 215-225
Author(s):  
Ricardo Berton ◽  
Marcos Soriano ◽  
Demostenys David da Silva ◽  
Marcel Lopes dos Santos ◽  
Gustavo Teixeira ◽  
...  
Keyword(s):  
Measurement Errors ◽  
Concurrent Validity ◽  
Direct Test ◽  
Validity And Reliability ◽  
Repetition Maximum ◽  
Typical Error ◽  
Velocity Relationship ◽  
The One ◽  
Power Clean ◽  
Adequate Reliability

The study investigated the concurrent validity and reliability of the load-velocity relationship to predict the one-repetition maximum (1RM) of the power clean from the knee (PCK), high pull from the knee (HPK), and mid-thigh clean pull (MTCP). For each exercise, 12 participants performed two 1RM sessions tests and two sessions to measure the barbell’s load-velocity relationship at 30, 45, 60, 75, and 90% of 1RM. The velocity recorded at each load was used to establish the linear regression equation and, consequently, to predict 1RM value. A low validity between the 1RM direct test and predicted 1RM was observed for PCK (typical error [TE]=3.96 to 4.50 kg, coefficient of variation [CV]=4.68 to 5.27%, effect size [ES]=-0.76 to -0.58, Bland-Altman bias [BAB]=9.83 to 11.19 kg), HPK (TE=4.58 to 5.82 kg, CV=6.44 to 8.14%, ES=-0.40 to -0.39, BAB=3.52 to 4.17 kg), and MTCP (TE=6.33 to 8.08 kg, CV=4.78 to 6.16%, ES=-0.29 to -0.19, BAB=3.98 to 6.17 kg). Adequate reliability was observed for the 1RM direct test and for the predicted 1RM. However, based on Bland-Altman limits of agreement, lower measurement errors were obtained for the 1RM direct test in comparison to the predicted 1RM for all the exercises. In conclusion, the load-velocity relationship was not able to predict 1RM values with high accuracy in the PCK, HPK, and MTCP. Moreover, the 1RM direct test was the most reliable for PCK, HPK and MTCP.

scholarly journals Where does the One-Repetition Maximum Exist on the Force-Velocity Relationship in Squat?

2017 ◽  
Vol 38 (13) ◽  
pp. 1035-1043 ◽  
Author(s):  
Jean Rivière ◽  
Jérémy Rossi ◽  
Pedro Jimenez-Reyes ◽  
Jean-Benoit Morin ◽  
Pierre Samozino
Keyword(s):  
Lower Limb ◽  
Goodness Of Fit ◽  
Reaction Force ◽  
Squat Jump ◽  
Repetition Maximum ◽  
Velocity Relationship ◽  
Force Velocity ◽  
The Difference ◽  
The One ◽  
The Individual

AbstractThe aim was to determine the position of the one-repetition maximum (1RM) squat point on the force-velocity (F-V) relationship obtained during squat jump (SJ). Ten healthy athletes performed a 1RM squat during which ground reaction force and lower-limb extension velocity were measured, and six loaded SJs to determine individual F-V relationship. The goodness of fit of the linear F-V relationship with or without the 1RM point was tested. The vertical and horizontal coordinates were determined relative to the theoretical maximal force (F0) and the highest loaded SJ (load of 44.5±4.6% 1RM). The goodness of fit of the individual F-V relationship did not differ with or without the 1RM condition, even if the 1RM point was slightly below the curve (−5±5%, P=0.018). The 1RM point can be considered as a point of the F-V relationship. The velocity (0.22±0.05 m.s−1) of the 1RM point corresponded to ~30% of the velocity reached during the highest loaded SJ. The force developed in the 1RM condition was ~16% higher than during the highest loaded SJ and ~11% lower than F0. This finding underlines the difference between F0 and the 1RM condition.

scholarly journals Validity and Reliability of a Smartphone Accelerometer for Measuring Lift Velocity in Bench-Press Exercises

2020 ◽  
Vol 12 (6) ◽  
pp. 2312
Author(s):  
Javier Peláez Barrajón ◽  
Alejandro F. San Juan
Keyword(s):  
Bench Press ◽  
Basic Program ◽  
Validity And Reliability ◽  
Training Experience ◽  
Mean Velocity ◽  
Repetition Maximum ◽  
Linear Transducer ◽  
The Mean ◽  
One Year ◽  
The One

The aim of this study was to determine the validity and reliability that a smartphone accelerometer (ACC) used by a mobile basic program (MBP) can provide to measure the mean velocity of a bench-press (BP) lift. Ten volunteers participated in the study (age 23.1 ± 2.5 years; mean ± SD). They had more than one year of resistance training experience in BP exercise. All performed three attempts with different loads: 70%, 90%, and 100% of the estimated value of the one-repetition maximum (1RM). In each repetition, the mean velocity was measured by a validated linear transducer and the ACC. The smartphone accelerometer used by the mobile basic program showed no significant differences between the mean velocities at 70% 1RM lifts (ACC = 0.52 ± 0.11 m/s; transducer = 0.54 ± 0.09 m/s, p > 0.05). However, significant differences were found in the mean velocities for 90% 1RM (ACC = 0.46 ± 0.09 m/s; transducer = 0.31 ± 0.03 m/s, p < 0.001), and 100% 1RM (ACC = 0.33 ± 0.21 m/s; transducer = 0.16 ± 0.04 m/s, p < 0.05). The accelerometer is sensitive enough to measure different lift velocities, but the algorithm must be correctly calibrated.

Validity and Reliability of a Standardized Protocol for Assessing the One Repetition Maximum Performance During Overhead Pressing Exercises

2020 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Marcos A. Soriano ◽  
Amador García-Ramos ◽  
Antonio Torres-González ◽  
Joaquín Castillo-Palencia ◽  
Víctor Ayuso ◽  
...  
Keyword(s):  
Validity And Reliability ◽  
Maximum Performance ◽  
Repetition Maximum ◽  
Standardized Protocol ◽  
The One

A Study of Environmental awareness among the students at Shaqra University and its relationship with sustainable development: دراسة مستوى الوعي البيئي لدى طالبات جامعة شقراء وعلاقته بالتنمية المستدامة

2020 ◽  
Vol 4 (2) ◽  
Author(s):  
Laila Hanafy Kamel
Keyword(s):  
Sustainable Development ◽  
Statistical Significance ◽  
Environmental Awareness ◽  
Control Sample ◽  
Environmental Information ◽  
Female Students ◽  
Validity And Reliability ◽  
Fourth Level ◽  
The One ◽  
Level Of Significance

The current study focused on measuring environmental awareness and its relationship to the variables of specialization and age, on the one hand, and its relationship to sustainable development among Shaqra University students in Shaqra in the second semester of the year 2018/2019 where the research community included three colleges, namely the College of Education, the College of Sciences and Humanities and the College of Applied Medical Sciences, In order to achieve the research objectives, the choice was made on the scale of environmental awareness that was used by (Al- Badrani, 2004), citing (Al- Dakhil, 2000), which consists of two axes, the first axis concerns environmental information and the second axis is concerned with the attitude towards the environment and adjustments were made to be ready for implementation as was the Confirmed the validity and reliability of the scale appropriate ways. The sample of the study was 110 female students, who were selected from the control sample Fourth level female students, the results of the research showed that the level of environmental awareness among the three college students is lower than the default test, 70% of the degree of the questionnaire, where the average awareness of the students reached 58.32%. The results also showed an inverse relationship between environmental information and behavior towards the environment. Statistical significance according to the speciality or age variable at the level of indication α= 0.05 The research also showed a strong correlation between environmental awareness and the information of female students on sustainable development of the environment at the level of significance α= 0. 01 and a number of recommendations were made that aim to raise the level of environmental awareness for students and activate the diffusion of green culture to protect the environment.

Differences in the one-repetition maximum and load-velocity profile between the flat and arched bench press in competitive powerlifters

2018 ◽  
pp. 1-13 ◽  
Author(s):  
Amador García-Ramos ◽  
Alejandro Pérez-Castilla ◽  
Francisco Javier Villar Macias ◽  
Pedro Á. Latorre-Román ◽  
Juan A. Párraga ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Bench Press ◽  
Repetition Maximum ◽  
The One

Reliability and validity of different methods of estimating the one-repetition maximum during the free-weight prone bench pull exercise

2019 ◽  
Vol 37 (19) ◽  
pp. 2205-2212 ◽  
Author(s):  
Amador García-Ramos ◽  
Paola Barboza-González ◽  
David Ulloa-Díaz ◽  
Angela Rodriguez-Perea ◽  
Darío Martinez-Garcia ◽  
...  
Keyword(s):  
Reliability And Validity ◽  
Repetition Maximum ◽  
Free Weight ◽  
The One

scholarly journals Validity and reliability of an optoelectronic system to measure movement velocity during bench press and half squat in a Smith machine

2019 ◽  
Vol 234 (1) ◽  
pp. 88-97
Author(s):  
Borja Muniz-Pardos ◽  
Gabriel Lozano-Berges ◽  
Jorge Marin-Puyalto ◽  
Alex Gonzalez-Agüero ◽  
German Vicente-Rodriguez ◽  
...  
Keyword(s):  
Bench Press ◽  
Reference Method ◽  
Testing Session ◽  
Validity And Reliability ◽  
Optoelectronic System ◽  
Movement Velocity ◽  
Force System ◽  
Repetition Maximum ◽  
Strength Exercises ◽  
Wide Range

The purpose of this study was to determine the validity and reliability of a camera-based optoelectronic system to measure movement velocity during bench press and half squat at different load intensities. A total of 22 active males (age: 28.2 ± 3.9 years; one-repetition maximum bench press: 77.9 ± 19.0 kg; one-repetition maximum half squat: 116.6 ± 22.5 kg) participated in this study. After an initial one-repetition maximum testing session, participants performed five repetitions for each load (40%, 60% and 80% one-repetition maximum) and exercise (bench press and half squat) on a Smith machine in the second testing session. A third testing session was used for the test–retest reliability study. Time, displacement and mean propulsive velocity were simultaneously determined by the reference method (T-Force system) and the Velowin system. In bench press, ordinary least products regression analysis revealed low fixed biases for mean propulsive velocity at 40%, time at 60% and displacement at 80% one-repetition maximum (intercept = 0.065 m s−1, −28.02 ms and 0.87 cm, respectively). In half squat, low fixed biases were also detected for mean propulsive velocity at 40% and 80% one-repetition maximum (intercept = −0.040 and 0.023 m s−1, respectively), time at 40% and 60% one-repetition maximum (intercept = −53.05 and −101.85 ms, respectively) and displacement at 60% one-repetition maximum (intercept = −1.95 cm). Proportional bias was only observed for mean propulsive velocity at 80% bench press. In half squat, there was proportional bias for time and mean propulsive velocity at 40% one-repetition maximum, and also for time at 60% one-repetition maximum. The reliability test showed low and comparable fixed and proportional biases between systems across exercises and intensities. Velowin confirmed to be a valid and reliable system to measure movement velocity across a wide range of intensities (40%–80% one-repetition maximum) for two basic strength exercises through a robust statistical approach. Velowin would provide coaches and trainers with a suitable, affordable and easy-to-use equipment capable of measuring movement velocity in various exercises at different load intensities.

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