scholarly journals Ejercicios físicos diarios de intensidad moderada en el interior del aula mejora la fuerza de tren inferior y la agilidad en escolares: un estudio cuasi experimental (Daily moderate-intensity physical exercises inside the classroom improves lower body str

Retos ◽  
2021 ◽  
Vol 44 ◽  
pp. 585-594
Author(s):  
Gaston Eduardo Ibañez Rojas ◽  
Ivana Leao Ribeiro ◽  
Patricio Andres Inostroza Dominguez ◽  
Daniela Margarita Vergara Rojas ◽  
Ricardo Souza de Carvalho
Keyword(s):  
Body Mass Index ◽  
Body Mass ◽  
Moderate Intensity ◽  
Lower Body ◽  
Obesity And Overweight ◽  
Body Strength ◽  
Resistance Exercises ◽  
Daily Training ◽  
Lower Body Strength ◽  
Shuttle Run

 El estudio tuvo como objetivo determinar los cambios en la condición física y en el índice de masa corporal que se producen en una intervención de 16 semanas en escolares en . Setenta tres escolares (n=34 niñas; n=39 niños) con edad entre los 8 y 9 años recibieron las siguientes evaluaciones: flexibilidad de la musculatura dorsal de espalda (mediante la prueba de weels), fuerza muscular (mediante la prueba pararse y sentarse), agilidad (mediante la prueba 4x10m shuttle run) y índice de masa corporal (IMC) utilizando un estadiómetro y una balanza. Se aplicó un programa de entrenamiento con ejercicios de flexibilidad, fuerza y resistencia (30 minutos, 5x/semana). Hubo una disminución del IMC (diferencia de 0.60kg/cm2 en ambos géneros), aumento de la fuerza (10.4 repeticiones en niñas y 11.6 en niños) y mejora de la agilidad (0.91 segundos en niñas y 0.71 segundos en niños: p<0.05 en todas las comparaciones y tamaño de efecto entre 0.20-1.77 en niñas y 0.18-2.34 en niños). El índice de obesidad y sobrepeso entre el alumnado de la clase se vio reducido en un 5.3% y 5.9%, respectivamente. No hubo diferencias respecto a la flexibilidad (p>0.05). Un entrenamiento diario en el interior del aula sin implementación y en un espacio de un metro cuadrado , mejora la fuerza de tren inferior y la agilidad en escolares.  Abstract. The objective of the study was to determine the changes in physical condition and body mass index that occur in a 16-week intervention in schoolchildren inside the classroom. Seventy-three schoolchildren (n=34 girls; n=39 boys) between the ages of 8 and 9 received the following evaluations: flexibility of the dorsal back muscles, through the weels test, muscular strength, through the standing and sitting test, agility, through the 4x10m shuttle test run and body mass index (BMI) using a stadiometer and scale. A training program was applied with flexibility, strength and resistance exercises were performed (30 minutes, 5x/ week). There was a decrease in BMI, (difference of 0.60kg/cm2 in both genders), increase in strength (10.4 repetitions in girls and 11.6 in boys) and improvement of the agility (0.91 seconds in girls and 0.71 seconds in boys), p<0.05 in all comparisons and effect size between 0.20-1.77 in girls and 0.18-2.34 in boys. The rate of obesity and overweight among the students in the class was reduced by one 5.3% and 5.9% respectively. There were no differences in flexibility (p>0.05). A daily training in schoolchildren without implementation and in a space of one square meter decreases BMI, improves lower body strength and agility in schoolchildren.

A Descriptive Study of Lower-Body Strength and Power in Overweight Adolescents

2009 ◽  
Vol 21 (1) ◽  
pp. 34-46 ◽  
Author(s):  
James L. Nuzzo ◽  
Michael J. Cavill ◽  
N. Travis Triplett ◽  
Jeffrey M. McBride
Keyword(s):  
Body Mass ◽  
Vertical Jump ◽  
Descriptive Analysis ◽  
Lower Body ◽  
Maximal Strength ◽  
Jump Performance ◽  
Leg Press ◽  
Body Strength ◽  
Significant Difference ◽  
Lower Body Strength

The primary purpose of this investigation was to provide a descriptive analysis of lower-body strength and vertical jump performance in overweight male (n = 8) and female (n = 13) adolescents. Maximal strength was tested in the leg press and isometric squat. Kinetic and kinematic variables were assessed in vertical jumps at various loads. When compared with females, males demonstrated significantly greater (p ≤ .05) absolute maximal strength in the leg press. However, when maximal strength was expressed relative to body mass, no significant difference was observed. There were no significant differences between males and females in vertical jump performance at body mass.

scholarly journals Comparing periodised protocols for the maintenance of strength and power in resistance-trained women

2017 ◽  
Vol 6 (2) ◽  
Author(s):  
Kok Lian Yee
Keyword(s):  
Body Mass ◽  
Repeated Measures ◽  
Bench Press ◽  
Upper Body ◽  
Lower Body ◽  
Power Training ◽  
Body Strength ◽  
Upper Body Strength ◽  
Lower Body Strength ◽  
Training Programmes

Purpose: The purpose of the study was to compare the effects of daily undulating periodisation (DUP) and session undulating periodisation (SUP) for maintaining strength and power over a 3-wk period in a group of resistance-trained women.  DUP comprised one session each of strength and power training while DUP combined both strength and power training within each session.  Both training programmes were equalised for training volume and intensity.  Methods: Sixteen resistance-trained women were pre-tested for body mass, mid-arm and mid-thigh girths, one-repetition maximum (1 RM) dynamic squat (SQ) and bench press (BP), and  power during countermovement jumps (CMJ) and bench press throws (BPT). The 1 RM SQ and BP data were used to assign the participants into groups for twice a week training.  Results:  A two-way (group x time) analysis of variance (ANOVA) with repeated measures for time found no significant changes in body mass, mid-arm girth, 1 RM BP and SQ, and BPT and CMJ power for both groups.  However, significant changes in mid-thigh girth were found (F1, 13 = 5.733, p = 0.032). Pooled BP data indicated improved upper body strength (BP: F1, 13 = 6.346, p = 0.025) and decreased CMJ power (p = 0.016).  Conclusions:  Both DUP and SUP programmes increased upper-body strength and maintained lower-body strength adequately across a 3-wk phase probably because the participants were weaker in the upper-body and the lower-body had a reduced capacity for strength adaptations and improvements.

Factors That Affect Selection of Elite Women’s Sculling Crews

2013 ◽  
Vol 8 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Trent W. Lawton ◽  
John B. Cronin ◽  
Michael R. McGuigan
Keyword(s):  
Body Mass ◽  
Time Trial ◽  
Lower Body ◽  
Leg Press ◽  
Leg Strength ◽  
Arm Span ◽  
Body Strength ◽  
Lower Body Strength ◽  
Performance Gains ◽  
Rowing Ergometry

Purpose:There is no common theory on criteria to appropriately select crew rowers in pursuit of small performance gains. The purpose of this study was to establish whether anthropometry, rowing ergometry, or lower body strength were suitable criteria to identify differences between selected and nonselected sculling crews.Method:Twelve elite women performed a 2000-m ergometer time trial and a 5-repetition leg-press dynamometer test, were anthropometrically profiled, and participated in on-water national crew seat-racing trials. Log-transformed data were analyzed to compare percent (± SD) and standardized differences in group means (ES; ±90% confidence interval [CI]) between selected and nonselected oarswomen, with adjustments for body mass where appropriate.Results:Selected crew boats were 4.60% ± 0.02% faster and won by an average margin of 13.5 ± 0.7 s over 1500 m. There were no differences between crews on average in height, arm span, seated height, body mass, or 8-site skinfold sum (body fat). Difference in 2000-m ergometer times were also trivial (ES = 0.2, 90%CI = −0.6 to 1.1, P = .63); however, selected crews had moderately greater leg-press strength (ES = 1.1, 90%CI = 0.3−1.9, P = .03).Conclusion:Selected oarswomen with comparable anthropometry and 2000-m ergometer ability had greater lower body strength. Coaches of elite oarswomen might consider leg strength as part of crew-selection criteria, given acceptable on-water boatmanship and attainment of 2000-m ergometer benchmarks.

scholarly journals The Importance of Lower Body Strength and Power for Future Success in Professional Men’s Basketball

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Dimitrije Čabarkapa ◽  
Andrew C. Fry ◽  
Michael T. Lane ◽  
Andrea Hudy ◽  
Patricia R. Dietz ◽  
...  
Keyword(s):  
Body Mass ◽  
Repeated Measures ◽  
Effect Sizes ◽  
Lower Body ◽  
Load Spectrum ◽  
Basketball Players ◽  
Men's Basketball ◽  
Body Strength ◽  
Lower Body Strength ◽  
Few Data

Heavy resistance exercise is often prescribed for collegiate basketball players to enhance game performance, but few data are available concerning the transference of lower body strength and power to the opportunity to play professionally after college. This study investigated if lower body muscular power and strength measures obtained during the barbell squat are related to future professional playing opportunities. The data was collected over a seven year period from a collegiate men’s basketball program (n=37; X±SD, age=20.0±1.4 yrs, hgt=1.98±0.09 m, bw=94.5±11.8 kg). Lower body strength was determined from 1 repetition maximum (1RM) tests of the parallel high-bar squat. Maximum lower body squat power was determined from speed squat testing across a load spectrum (30-90% 1RM) while an external tethered dynamometer or a 3-D video motion capture system quantified barbell power. Repeated measures ANOVA with Tukey’s HSD post hoc, Spearman ρ correlations, and Cohen’s D effect sizes were used to analyze the results. Subjects who subsequently played in the NBA or in professional leagues elsewhere had greater lower body strength and power. This was mainly attributed to their greater body mass, since strength and power relative to body mass was not different between the groups. Even without statistically significant differences, effect sizes consistently indicated moderate to large differences between the NBA and other professional groups when compared to those who did not play professionally. Regardless, lower body strength and power were related to post-collegiate playing opportunities, with greater values related to higher levels of professional play.

scholarly journals Relationships Between Measures of Functional and Isometric Lower Body Strength, Aerobic Capacity, Anaerobic Power, Sprint and Countermovement Jump Performance in Professional Soccer Players

2020 ◽  
Vol 75 (1) ◽  
pp. 161-175
Author(s):  
Michał Boraczyński ◽  
Tomasz Boraczyński ◽  
Robert Podstawski ◽  
Zbigniew Wójcik ◽  
Piotr Gronek
Keyword(s):  
Body Mass ◽  
Aerobic Capacity ◽  
Anaerobic Power ◽  
Knee Extensor ◽  
Soccer Players ◽  
Lower Body ◽  
Countermovement Jump ◽  
Body Strength ◽  
Wide Range ◽  
Lower Body Strength

Abstract The purpose of this study was to assess a wide range of physiological and performance variables and investigate whether and to what extent these variables are associated with each other in soccer. Twenty-five male soccer players (25.1 ± 4.56 years; body mass, 75.2 ± 5.92 kg; body height, 180.6 ± 5.45 cm) performed: 5- and 30-m sprints (T5m and T30m, respectively), 1-repetition-maximum (1RM) half squat, maximal voluntary isometric contraction (MVIC) of the knee extensors, countermovement jump (CMJ) to obtain vertical jump height (CMJheight) and power output (CMJpower), the 10-s Wingate Anaerobic Test (WAnT) to obtain peak power (Pmax), and the 20-m multi-stage shuttle run test (MST) to evaluate aerobic capacity. 1RM, MVIC, and Pmax were normalized to body mass. Large negative correlations were found between sprint times and 1RM half back squat/BM (r = -0.510 to -0.570, r2 = 0.260–0.325, both p < 0.01) and Pmax/BM (r = -0.501, r2 = 0.251, p < 0.01). T30m most strongly and negatively correlated with CMJheight (r = -0.744, r2 = 0.554, p < 0.001). WAnT-determined Pmax showed a very large correlation between absolute Pmax and knee-extensor MVIC (r = 0.827, r2 = 0.684, p < 0.001) and large correlations between absolute Pmax and 1RM half squat (r = 0.674, r2 = 0.454, p < 0.001) and CMJpower (r = 0.579, r2 = 0.335, p < 0.01). We also identified a large inverse relationship between CMJheight and T30m (r = -0.744, r2 = 0.554, p < 0.001) and large positive correlation between CMJheight and MVIC/BM (r = 0.702, p < 0.001). The results demonstrate that elite soccer players with greater lower body strength (quantified by the MVIC of the knee extensor and the 1RM half squat) show better sprint and CMJ performance, suggesting the incorporation of soccer-specific resistance training to develop lower body musculature and therefore maximize sprinting ability. The higher correlation coefficients found between T30m and the physiological and athletic measures compared with T5m promote the use of this sprint distance when assessing performance. The use of relative measures (normalized to body mass) is advisable when comparing strength variables with sprint and CMJ performance or anaerobic power. Considering the correlations of WAnT-determined Pmax versus CMJpower, coaches should administer tests that assess jumping and linear sprint performance rather than the cycling-specific WAnT.

scholarly journals A Preliminary Investigation: Evaluating the Effectiveness of an Occupational Specific Training Program to Improve Lower Body Strength and Speed for Law Enforcement Officers

2021 ◽  
Vol 18 (14) ◽  
pp. 7685
Author(s):  
Ian Bonder ◽  
Andrew Shim ◽  
Robert G. Lockie ◽  
Tara Ruppert
Keyword(s):  
Law Enforcement ◽  
Training Program ◽  
Injury Risk ◽  
Preliminary Investigation ◽  
Lower Body ◽  
Specific Training ◽  
Body Strength ◽  
Post Test ◽  
Lower Body Strength ◽  
Post Shift

Based on current law enforcement officer (LEO) duties, musculoskeletal injury risk is elevated due to the unpredictable nature of physically demanding tasks. The purpose of this 4-week study was to determine the effectiveness of a 15-min post-shift standardized occupational specific training program. The standardized program was designed to improve lower-body strength and speed to aid physically demanding task performance. Seven male LEOs completed the program after their 12-h shift. Subjects were required to use the department fitness center to perform the 15-min standardized program consisting of a dynamic warm-up, 4 sets of 3 repetitions on hex-bar deadlift and four 20-m sprints. Two minutes of rest was required between each set of 3 repetitions on hex-bar deadlift and 1 min of rest between each 20-m sprint. A dependent T-test was used between pre-test and post-test scores for hex-bar deadlift (HBD) and sprint. Data revealed significant improvements in relative lower-body strength with HBD (p ≤ 0.001). However, insignificant results were demonstrated with the 20-m sprint (p ≤ 0.262). In conclusion, a 15-min post-shift workout can improve lower-body strength as measured by the hex-bar deadlift. However, data indicated running speed may require a different training approach to improve the 20-m sprint.

scholarly journals Development of Maximal Dynamic Strength During Concurrent Resistance and Endurance Training in Untrained, Moderately Trained, and Trained Individuals: A Systematic Review and Meta-analysis

2021 ◽  
Vol 51 (5) ◽  
pp. 991-1010
Author(s):  
Henrik Petré ◽  
Erik Hemmingsson ◽  
Hans Rosdahl ◽  
Niklas Psilander
Keyword(s):  
Resistance Training ◽  
Endurance Training ◽  
Meta Analysis ◽  
Dynamic Strength ◽  
Concurrent Training ◽  
Strength Development ◽  
Lower Body ◽  
Body Strength ◽  
Lower Body Strength ◽  
Maximal Dynamic Strength

Abstract Background The effect of concurrent training on the development of maximal strength is unclear, especially in individuals with different training statuses. Objective The aim of this systematic review and meta-analysis study was to compare the effect of concurrent resistance and endurance training with that of resistance training only on the development of maximal dynamic strength in untrained, moderately trained, and trained individuals. Methods On the basis of the predetermined criteria, 27 studies that compared effects between concurrent and resistance training only on lower-body 1-repetition maximum (1RM) strength were included. The effect size (ES), calculated as the standardised difference in mean, was extracted from each study, pooled, and analysed with a random-effects model. Results The 1RM for leg press and squat exercises was negatively affected by concurrent training in trained individuals (ES =  – 0.35, p < 0.01), but not in moderately trained ( – 0.20, p = 0.08) or untrained individuals (ES = 0.03, p = 0.87) as compared to resistance training only. A subgroup analysis revealed that the negative effect observed in trained individuals occurred only when resistance and endurance training were conducted within the same training session (ES same session =  – 0.66, p < 0.01 vs. ES different sessions =  – 0.10, p = 0.55). Conclusion This study demonstrated the novel and quantifiable effects of training status on lower-body strength development and shows that the addition of endurance training to a resistance training programme may have a negative impact on lower-body strength development in trained, but not in moderately trained or untrained individuals. This impairment seems to be more pronounced when training is performed within the same session than in different sessions. Trained individuals should therefore consider separating endurance from resistance training during periods where the development of dynamic maximal strength is prioritised.

scholarly journals Influence of Playing Standard on Upper- and Lower-Body Strength, Power, and Velocity Characteristics of Elite Rugby League Players

2019 ◽  
Vol 4 (2) ◽  
pp. 22 ◽  
Author(s):  
John F. T. Fernandes ◽  
Matthew Daniels ◽  
Liam Myler ◽  
Craig Twist
Keyword(s):  
Bench Press ◽  
Peak Velocity ◽  
First Grade ◽  
Rugby League ◽  
Power Relationships ◽  
Lower Body ◽  
Body Strength ◽  
Lower Body Strength ◽  
Lower Body Power ◽  
Level Resistance

Background: To compare load–velocity and load–power relationships among first grade (n = 26, age 22.9 ± 4.3 years), academy (n = 23, age 17.1 ± 1.0 years), and scholarship (n = 16, age 15.4 ± 0.5 years) Super League rugby league players. Methods: Participants completed assessments of maximal upper- and lower-body strength (1RM) and peak velocity and power at 20, 40, 60, and 80 kg during bench press and squat exercises, in a randomised order. Results: Bench press and squat 1RM were highest for first grade players compared with other standards (effect size (ES) = −0.43 to −3.18). Peak velocities during bench and squat were greater in the higher playing standards (ES = −0.39 to −3.72 range), except for the squat at 20 and 40 kg. Peak power was higher in the better playing standards for all loads and exercises. For all three groups, velocity was correlated to optimal bench press power (r = 0.514 to 0.766), but only 1RM was related to optimal power (r = 0.635) in the scholarship players. Only squat 1RM in the academy was related to optimal squat power (r = 0.505). Conclusions: Peak velocity and power are key physical qualities to be developed that enable progression from junior elite rugby league to first grade level. Resistance training should emphasise both maximal strength and velocity components, in order to optimise upper- and lower-body power in professional rugby league players.

scholarly journals Are Men More Intuitive When It Comes to Eating and Physical Activity?

2011 ◽  
Vol 6 (2) ◽  
pp. 164-171 ◽  
Author(s):  
Julie Gast ◽  
Hala Madanat ◽  
Amy Campbell Nielson
Keyword(s):  
Physical Activity ◽  
Body Mass Index ◽  
Weight Loss ◽  
Intrinsic Motivation ◽  
Weight Management ◽  
Body Mass ◽  
Demographic Variables ◽  
Intuitive Eating ◽  
Lower Body ◽  
Behavioral Regulation

The purpose of this study was to determine where men fall on the motivation continuum based on intuitive eating status and if motivation for physical activity and intuitive eating are correlated. Results indicate that being an intuitive eater was associated with a lower body mass index. In terms of demographic variables, as age increased, intuitive eating status decreased and body mass index increased. Men scored high on the antidieting and self-care subscales of the Intuitive Eating Scale. Men who were classified as intuitive eaters scored higher on the external and introjected regulation of the Behavioral Regulation in Exercise Questionnaire but no significant differences were reported by eating status and the identified and intrinsic motivation subscales. Intuitive eating holds promise as a weight management and weight loss tool for men. Intuitive eating may also influence initial motivation for physical activity for men.

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