Concurrent Validity of a Velocity Perception Scale to Monitor Back Squat Exercise Intensity in Young Skiers

2016 ◽  
Vol 30 (2) ◽  
pp. 421-429 ◽  
Author(s):  
Iker J. Bautista ◽  
Ignacio J. Chirosa ◽  
Joseph E. Robinson ◽  
Luis J. Chirosa ◽  
Isidoro Martínez
Keyword(s):  
Exercise Intensity ◽  
Concurrent Validity ◽  
Back Squat ◽  
Squat Exercise ◽  
Velocity Perception

Reliability and concurrent validity of the Velowin optoelectronic system to measure movement velocity during the free-weight back squat

2018 ◽  
Vol 13 (5) ◽  
pp. 737-742 ◽  
Author(s):  
Amador García-Ramos ◽  
Alejandro Pérez-Castilla ◽  
Fernando Martín
Keyword(s):  
Concurrent Validity ◽  
Body Height ◽  
Maximum Velocity ◽  
Single Session ◽  
Optoelectronic System ◽  
Mean Velocity ◽  
Movement Velocity ◽  
Back Squat ◽  
Free Weight ◽  
Squat Exercise

The objective of this study was to explore the reliability and concurrent validity of the Velowin optoelectronic system to measure movement velocity during the free-weight back squat exercise. Thirty-one men (age = 27.5 ± 3.2 years; body height = 1.76 ± 0.15 m; body mass: 78.3 ± 7.6 kg) were evaluated in a single session against five different loads (20, 40, 50, 60 and 70 kg) and three velocity variables (mean velocity, mean propulsive velocity and maximum velocity) were recorded simultaneously by a linear velocity transducer (T-Force; gold-standard) and a camera-based optoelectronic system (Velowin). The main findings revealed that (1) the three velocity variables were determined with a high and comparable reliability by both the T-Force and Velowin systems (median coefficient of variation of the five loads: T-Force: mean velocity = 4.25%, mean propulsive velocity = 4.49% and maximum velocity = 3.45%; Velowin: mean velocity = 4.29%, mean propulsive velocity = 4.60% and maximum velocity = 4.44%), (2) the maximum velocity was the most reliable variable when obtained by the T-force ( p < 0.05), but no significant differences in the reliability of the variables were observed for the Velowin ( p > 0.05) and (3) high correlations were observed for the values of mean velocity ( r = 0.976), mean propulsive velocity ( r = 0.965) and maximum velocity ( r = 0.977) between the T-Force and Velowin systems. Collectively, these results support the Velowin as a reliable and valid system for the measurement of movement velocity during the free-weight back squat exercise.

Joint-Level Analyses of the Back Squat With and Without Intraset Rest

2019 ◽  
Vol 14 (5) ◽  
pp. 583-589 ◽  
Author(s):  
Jason D. Stone ◽  
Adam C. King ◽  
Shiho Goto ◽  
John D. Mata ◽  
Joseph Hannon ◽  
...  
Keyword(s):  
Sagittal Plane ◽  
Movement Pattern ◽  
Joint Angles ◽  
Mean Power ◽  
Joint Power ◽  
Joint Level ◽  
Back Squat ◽  
Squat Exercise ◽  
Limb Kinematics ◽  
Plane Joint

Purpose: To provide a joint-level analysis of traditional (TS) and cluster (CS) set structure during the back-squat exercise. Methods: Eight men (24 [3] y, 177.3 [7.9] cm, 82.7 [11.0] kg, 11.9 [3.5] % body fat, and 150.3 [23.0] kg 1-repetition maximum [1RM]) performed the back-squat exercise (80%1RM) using TS (4 × 6, 2-min interset rest) and CS (4 × [2 × 3], 30-s intraset rest, 90-s interset rest), randomly. Lower-limb kinematics were collected by motion capture, as well as kinetic data by bilateral force platforms. Results: CS attenuated the loss in mean power (TS −21.6% [3.9%]; CS −12.4% [7.5%]; P = .042), although no differences in gross movement pattern (sagittal-plane joint angles) within and between conditions were observed (P ≥ .05). However, joint power produced at the hip increased from repetition (REP) 1 through REP 6 during TS, while a decrease was noted at the knee. A similar pattern was observed in the CS condition but was limited to the hip. Joint power produced at the hip increased from REP 1 through REP 3 but returned to REP 1 values before a similar increase through REP 6, resulting in differences between conditions (REP 4, P = .018; REP 5, P = .022). Conclusions: Sagittal-plane joint angles did not change in either condition, although CS elicited greater power. Differing joint power contributions (hip and knee) suggest potential central mechanism that may contribute to enhanced power output during CS and warrant further study. Practitioners should consider incorporating CS into training to promote greater power adaptations and to mitigate fatigue.

scholarly journals Effects of front and back squat techniques on patellofemoral joint kinetics in males

2015 ◽  
Vol 2 (1) ◽  
pp. 76 ◽  
Author(s):  
J Sinclair ◽  
S Atkins ◽  
N Kudiersky ◽  
PJ Taylor ◽  
H Vincent
Keyword(s):  
Patellofemoral Joint ◽  
Pain Syndrome ◽  
Current Investigation ◽  
Strength And Conditioning ◽  
Joint Kinetics ◽  
Associated Injury ◽  
Back Squat ◽  
Squat Exercise ◽  
Experienced Male ◽  
Joint Load

Purpose: The barbell squat is fundamental in strength and conditioning, with two principal variants; the back and front squat. Unfortunately, the propensity for injury is high particularly at the knee. The aim of the current investigation was examine the influence of front and back squat variations on patellofemoral joint load. Methods: Patellofemoral loads were obtained from thirty-five experienced male participants, who completed both back and front squats at 70% of 1 RM. Differences between squat conditions were examined using Bonferroni adjusted (P = .008) paired t-tests. Results: The results showed that significant differences (P < .008) in patellofemoral load were identified between both conditions with the highest load being experienced during the back squat exercise. Conclusions: Given the proposed relationship between the magnitude of the load experienced by the patellofemoral joint and associated injury pathology, the back squat appears to place lifters at greater risk from injury. Therefore, it may be prudent therefore for lifters who are predisposed to patellofemoral pain syndrome to utilize the front squat in their training.

scholarly journals Estimation of Relative Load From Bar Velocity in the Full Back Squat Exercise

2017 ◽  
Vol 01 (02) ◽  
pp. E80-E88 ◽  
Author(s):  
Luis Sánchez-Medina ◽  
Jesús Pallarés ◽  
Carlos Pérez ◽  
Ricardo Morán-Navarro ◽  
Juan González-Badillo
Keyword(s):  
Relative Strength ◽  
Loading Test ◽  
Mean Velocity ◽  
Relative Load ◽  
Back Squat ◽  
Training Approach ◽  
Velocity Relationship ◽  
Squat Exercise ◽  
Close Relationship ◽  
Bar Velocity

AbstractThe use of bar velocity to estimate relative load in the back squat exercise was examined. 80 strength-trained men performed a progressive loading test to determine their one-repetition maximum (1RM) and load-velocity relationship. Mean (MV), mean propulsive (MPV) and peak (PV) velocity measures of the concentric phase were analyzed. Both MV and MPV showed a very close relationship to %1RM (R2=0.96), whereas a weaker association (R2=0.79) and larger SEE (0.14 vs. 0.06 m·s−1) were found for PV. Prediction equations to estimate load from velocity were obtained. When dividing the sample into 3 groups of different relative strength (1RM/body mass), no differences were found between groups for the MPV attained against each %1RM. MV attained with the 1RM was 0.32±0.03 m·s−1. The propulsive phase accounted for ~82% of concentric duration at 40% 1RM, and progressively increased until reaching 100% at 1RM. Provided that repetitions are performed at maximal intended velocity, a good estimation of load (%1RM) can be obtained from mean velocity as soon as the first repetition is completed. This finding provides an alternative to the often demanding, time-consuming and interfering 1RM or nRM tests and allows implementing a velocity-based resistance training approach.

scholarly journals The Validity and Reliability of a Customized Rigid Supportive Harness During Smith Machine Back Squat Exercise

2014 ◽  
Vol 28 (3) ◽  
pp. 636-642 ◽  
Author(s):  
Brendan R. Scott ◽  
Ben J. Dascombe ◽  
Jace A. Delaney ◽  
Nathan Elsworthy ◽  
Robert G. Lockie ◽  
...  
Keyword(s):  
Validity And Reliability ◽  
Back Squat ◽  
Squat Exercise

The effects of a high-intensity free-weight back-squat exercise protocol on postural stability in resistance-trained males

2014 ◽  
Vol 33 (2) ◽  
pp. 211-218 ◽  
Author(s):  
R.M. Thiele ◽  
E.C. Conchola ◽  
T.B. Palmer ◽  
J.M. DeFreitas ◽  
B.J. Thompson
Keyword(s):  
High Intensity ◽  
Postural Stability ◽  
Exercise Protocol ◽  
Back Squat ◽  
Free Weight ◽  
Squat Exercise

Reliability of Trunk Muscle Electromyography in the Loaded Back Squat Exercise

2016 ◽  
Vol 37 (06) ◽  
pp. 448-456 ◽  
Author(s):  
D. Clark ◽  
M. Lambert ◽  
A. Hunter
Keyword(s):  
Trunk Muscle ◽  
Back Squat ◽  
Squat Exercise

scholarly journals Effect of Hip Abduction Maximal Voluntary Isometric Contraction on Lumbar Motion and Power Output During the Back Squat

2018 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Christopher F. Kelly ◽  
Adam M. Gonzalez ◽  
Robert W. Spitz ◽  
Katie M. Sell ◽  
Jamie J. Ghigiarelli
Keyword(s):  
Isometric Contraction ◽  
Power Output ◽  
Maximum Deviation ◽  
Lateral Flexion ◽  
Maximal Voluntary Isometric Contraction ◽  
Lumbar Flexion ◽  
Back Squat ◽  
Squat Exercise ◽  
Hip Abduction ◽  
Lumbar Motion

Background: Post-activation potentiation (PAP) is a neuromuscular phenomenon that has been shown to augment muscular force generating attributes as well as neural and sensory recruitment. While PAP has demonstrated to acutely enhance muscular performance during high-intensity activities, the effect of PAP on lumbopelvic kinematics under load remains unknown. Objectives: The purpose of this study was to examine the potential PAP effect of a hip abduction maximal voluntary isometric contraction (MVIC) on lumbar motion and power output during the barbell back squat.  Methods: Nine resistance-trained men (22.9±2.3 y; 85.0±13.8 kg; 174.3±5.1 cm) performed a set of 5 repetitions of the barbell back squat using 80% one-repetition maximum with and without a hip abduction MVIC prior to performance.  Experimental and control trials were randomized and counterbalanced among participants.  MVIC was carried out via manual long-lever hip abduction.  During the back squat exercise, lumbar motion analysis was performed using wireless motion-sensor technology, and power output was assessed via an accelerometer.  Results: No significant differences were observed between trials for lumbar flexion range of motion (ROM) (p=0.32), lumbar flexion maximum deviation (p=0.32), lumbar lateral flexion ROM (p=0.81), lumbar lateral flexion maximum deviation (p=0.98), lumbar rotation maximum deviation (p=0.70), average peak power (p=0.98), or average mean power output (p=0.99) during the squat protocol.  Conclusions: Implementation of a manual long-lever hip abduction MVIC prior to the back squat exercise did not significantly alter lumbar motion or augment power output in resistance trained males. 

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