and performance of athletes’ lower body is half squat ( McMaster, Gill, Cronin, & McGuigan, 2014 ), both male and female athletes carried out a maximum incremental strength test (MIST) in a half-squat apparatus with increasing intensities until they reached their one repetition maximum (1RM). We show
Jerónimo Aragón-Vela, Yaira Barranco-Ruiz, Cristina Casals-Vázquez, Julio Plaza-Díaz, Rafael A. Casuso, Luis Fontana and Jesús F. Rodríguez Huertas
Irineu Loturco, Lucas A. Pereira, Cesar C. Cal Abad, Saulo Gil, Katia Kitamura, Ronaldo Kobal and Fábio Y. Nakamura
To determine whether athletes from different sport disciplines present similar mean propulsive velocity (MPV) in the half-squat (HS) during submaximal and maximal tests, enabling prediction of 1-repetition maximum (1-RM) from MPV at any given submaximal load.
Sixty-four male athletes, comprising American football, rugby, and soccer players; sprinters and jumpers; and combat-sport strikers attended 2 testing sessions separated by 2–4 wk. On the first visit, a standardized 1-RM test was performed. On the second, athletes performed HSs on Smith-machine equipment, using relative percentages of 1-RM to determine the respective MPV of submaximal and maximal loads. Linear regression established the relationship between MPV and percentage of 1-RM.
A very strong linear relationship (R 2 ≈ .96) was observed between the MPV and the percentages of HS 1-RM, resulting in the following equation: %HS 1-RM = −105.05 × MPV + 131.75. The MPV at HS 1-RM was ~0.3 m/s.
This equation can be used to predict HS 1-RM on a Smith machine with a high degree of accuracy.
Timothy J. Suchomel, Kimitake Sato, Brad H. DeWeese, William P. Ebben and Michael H. Stone
The purposes of this study were to examine the effect of ballistic concentric-only half-squats (COHS) on subsequent squat-jump (SJ) performances at various rest intervals and to examine the relationships between changes in SJ performance and bilateral symmetry at peak performance. Thirteen resistance-trained men performed an SJ immediately and every minute up to 10 min on dual force plates after 2 ballistic COHS repetitions at 90% of their 1-repetition-maximum COHS. SJ peak force, peak power, net impulse, and rate of force development (RFD) were compared using a series of 1-way repeated-measures ANOVAs. The percent change in performance at which peak performance occurred for each variable was correlated with the symmetry index scores at the corresponding time point using Pearson correlation coefficients. Statistical differences in peak power (P = .031) existed between rest intervals; however, no statistically significant pairwise comparisons were present (P > .05). No statistical differences in peak force (P = .201), net impulse (P = .064), and RFD (P = .477) were present between rest intervals. The relationships between changes in SJ performance and bilateral symmetry after the rest interval that produced the greatest performance for peak force (r = .300, P = .319), peak power (r = –.041, P = .894), net impulse (r = –.028, P = .927), and RFD (r = –.434, P = .138) were not statistically significant. Ballistic COHS may enhance SJ performance; however, the changes in performance were not related to bilateral symmetry.
Manuel Terraza-Rebollo and Ernest Baiget
.2) 1RM HS/body mass 1.4 (0.2) 1.4 (0.2) 1.3 (0.2) Abbreviations: 1RM BP = 1-repetition maximum in bench press; 1RM HS = 1-repetition maximum in half squat. Note: Values are presented as mean (SD). All the subjects had over 4 years of experience in competition tennis training, did not practice another
Irineu Loturco, Timothy Suchomel, Chris Bishop, Ronaldo Kobal, Lucas A. Pereira and Michael McGuigan
researchers to better select appropriate training strategies for their athletes. Thus, the aims of the present study were to: (1) analyze the correlations between bar-power outputs (under optimum loading conditions) and 1RM values (assessed in half-squat [HS] and jump squat [JS] exercises), and multiple
Moritz Schumann, Hannah Notbohm, Simon Bäcker, Jan Klocke, Stefan Fuhrmann and Christoph Clephas
swimming performance test, maximal strength performance was assessed by subjects’ 1RM in half squat and bench press, respectively. Following a warm-up of 5 repetitions at 60% 1RM, subjects performed a maximal of 5 trials to achieve the 1RM. Five minutes of rest were allowed between subsequent trials. The
Kevin L. de Keijzer, Stuart A. McErlain-Naylor, Antonio Dello Iacono and Marco Beato
·kg −1 body mass) on an ergometer (Sport Excalibur; Lode, Groningen, The Netherlands). Dynamic mobilization exercises for a duration of 3 minutes, using the same procedure previously described by this research group, 1 , 16 consisted of dynamic movements mimicking the EOL exercise (eg, half squat) and
Ty B. Palmer, Jose G. Pineda and Rachel M. Durham
Quarter Squat Positions Variable Parallel squat Half squat Quarter squat PF P-value 0.34 0.88 0.12 ICC 2,1 0.840 0.839 0.904 SEM (N) 93.5 111.1 82.9 CV (SEM%) 12.0 11.2 6.6 MD (N) 259.1 307.9 229.7 Peak RFD P-value 0.28 0.07 0.92 ICC 2,1 0.601 0.547 0.852 SEM (N·s −1 ) 3343.5 4158.3 2276.1 CV
Marco Beato, Stuart A. McErlain-Naylor, Israel Halperin and Antonio Dello Iacono
and training status Intervention Rest interval Intensity Findings Hedges g effect size Beato et al, 34 2019 12 physically active men EOL condition 1: 3 × 6 half squats at M-EOL EOL condition 2: 3 × 6 half squats at H-EOL (Rev: 2-min passive) or control 30 s, 3 min, and 6 min Inertia (kg·m 2 ): M
Mehrez Hammami, Nawel Gaamouri, Gaith Aloui, Roy J. Shephard and Mohamed Souhaiel Chelly
trials were conducted in each direction, with 2-minute rest intervals. Test–retest reliabilities for the 3 reach directions were .90 to .95, with respective CVs of 12.7%, 12.0%, and 28.5% for the right leg and 12.0%, 12.1%, and 25.9% for the left leg. 1-RM Back Half-Squat at 90° Knee Flexion Subjects