Effects of three 8-week strength training programs on jump, speed and agility performance in prepubertal children

2021 ◽  
pp. 1-10
Author(s):  
Diego A.R. Jaimes ◽  
Jorge L. Petro ◽  
Diego A. Bonilla ◽  
Johanny G. Cárdenas ◽  
Ailin O. Duarte ◽  
...  
Keyword(s):  
Strength Training ◽  
Effect Size ◽  
Training Programs ◽  
Vertical Jump ◽  
Physical Growth ◽  
Children And Youth ◽  
Effect Sizes ◽  
General Health Status ◽  
Physiological Adaptations ◽  
Before And After

BACKGROUND: Supervised strength training has been shown to promote physiological adaptations in children and youth that can be beneficial to the process of physical growth and developed, and general health status. METHODS: Sixty-three children (9.2 ± 0.5 years old) were randomly assigned to training groups: multi jumps (MJ) (n= 20), sled towing (ST) (n= 21), or uphill running (UR) (n= 22). The following tests were applied before and after each intervention: vertical jump (ABK, CMJ, SJ), standing broad jump (SBJ), velocity/agility 4 × 10 m, and 20 m sprint test (ST20m). RESULTS: After 8 weeks of training, statistically significant changes were found in all study variables for all groups, but with different effect sizes. In the ABK jump, the largest effect size was observed in UR (1.40, 0.97–1.85), while in ST and MJ it was medium (0.67, 0.44–0.98 and 0.48, 0.17–0.82, respectively). Similarly, the effect size in the SJ jump was large for the UR and ST groups (1.10, 0.78–1.51 and 1.30, 0.98–1.64, respectively) and medium in MJ (0.56, 0.24–0.97). However, the magnitude of the effect registered in SBJ was large in MJ (0.80, 0.55–1.15) and medium in UR and ST (0.56, 0.32–0.86 and 0.64, 0.42–1.013, respectively). CONCLUSIONS: All three training programs improve jumping and velocity/agility performance but based on clinical significance, UR and ST methods can be considered more efficient to improve physical performance in children.

scholarly journals Unilateral and Bilateral Post-Activation Performance Enhancement on Jump Performance and Agility

2021 ◽  
Vol 18 (19) ◽  
pp. 10154
Author(s):  
Alejandro Escobar Hincapié ◽  
Carlos Alberto Agudelo Velásquez ◽  
Mariluz Ortiz Uribe ◽  
Camilo Andrés García Torres ◽  
Andrés Rojas Jaramillo
Keyword(s):  
Effect Size ◽  
Performance Enhancement ◽  
Vertical Jump ◽  
Effect Sizes ◽  
Training Experience ◽  
Jump Performance ◽  
Warm Up ◽  
Vertical Jumping ◽  
Different Types ◽  
Before And After

This study aimed to compare the effects of the post-activation performance enhancement (PAPE) of two different types of warm-ups, unilateral and bilateral, on the performance in vertical jumping and agility of healthy subjects with strength training experience. In the study, 17 subjects (12 men and 5 women) performed two different PAPE protocols: unilateral squat (UT) and bilateral squat (BT). The height of the subjects’ countermovement jump (CMJ) and the subjects’ time to perform the T-agility test (TAT) were measured before and after executing the PAPE warm-up. The squats were performed at a velocity of 0.59 m·s−1 with three sets of three repetitions, with a 3-min rest between sets and a 5-min rest after both uni-and bilateral PAPE warm-ups before taking the tests again. For statistical analysis, we applied ANOVA and calculated the effect size. The results showed that the PAPE for each case decreased the CMJ height but generated significant improvements in the total time taken for the T-agility test (p < 0.01); however, in both cases, the effect sizes were trivial. In conclusion, it is possible to observe that the PAPE, performed both unilaterally and bilaterally, negatively affects the performance in the vertical jump, showing moderate effect sizes. However, both PAPE protocols show performance benefits in agility tests, with a large effect size for the unilateral protocol and moderate for the bilateral protocol.

Clinically Meaningful Change

Methodology ◽  
2019 ◽  
Vol 15 (3) ◽  
pp. 97-105
Author(s):  
Rodrigo Ferrer ◽  
Antonio Pardo
Keyword(s):  
Effect Size ◽  
False Negative ◽  
False Negative Rate ◽  
Point Of View ◽  
Skewed Distribution ◽  
Effect Sizes ◽  
False Negatives ◽  
Large Size ◽  
Before And After ◽  
Post Test

Abstract. In a recent paper, Ferrer and Pardo (2014) tested several distribution-based methods designed to assess when test scores obtained before and after an intervention reflect a statistically reliable change. However, we still do not know how these methods perform from the point of view of false negatives. For this purpose, we have simulated change scenarios (different effect sizes in a pre-post-test design) with distributions of different shapes and with different sample sizes. For each simulated scenario, we generated 1,000 samples. In each sample, we recorded the false-negative rate of the five distribution-based methods with the best performance from the point of view of the false positives. Our results have revealed unacceptable rates of false negatives even with effects of very large size, starting from 31.8% in an optimistic scenario (effect size of 2.0 and a normal distribution) to 99.9% in the worst scenario (effect size of 0.2 and a highly skewed distribution). Therefore, our results suggest that the widely used distribution-based methods must be applied with caution in a clinical context, because they need huge effect sizes to detect a true change. However, we made some considerations regarding the effect size and the cut-off points commonly used which allow us to be more precise in our estimates.

scholarly journals Acute Effects of Strength Training Programs on Vertical Jump and Technical Actions in Handball during Preseason

2014 ◽  
Vol 3 ◽  
pp. 30.25.CP.3.2
Author(s):  
Eduardo A. Abade ◽  
Bruno V. Gonçalves ◽  
José M. Vilaça ◽  
Jaime E. Sampaio
Keyword(s):  
Strength Training ◽  
Training Programs ◽  
Vertical Jump ◽  
Acute Effects

scholarly journals The effect of different training programs on throwing accuracy of elite female handball players

2017 ◽  
Vol 14 (4) ◽  
pp. 3432
Author(s):  
Nebahat Eler ◽  
Serdar Eler
Keyword(s):  
Strength Training ◽  
Training Program ◽  
Training Programs ◽  
Acute Effect ◽  
Maximal Strength ◽  
Mean Values ◽  
Significant Difference ◽  
Throwing Accuracy ◽  
Before And After ◽  
The Mean

The aim of this study is to examine the acute effect of different training programs applied to elite female handball players on throwing accuracy. 14 elite female players were participated in the study. The mean age of the participating players was 28.64 ± 9.88 (years), the mean height length was 176.50 ± 4.86 (cm), the mean body weight was 68.07 ± 2.12 (kg) and the mean sport age was 14.36 ± 4.89 (years). On different days, a technical training program, maximal strength training program, strength endurance training program and speed power training program have been implemented to the participating players in the research.  Before and after training, the players throwing the ball from their area to the specific points of goal and the percentage of accuracy was determined. As a result; there was a significant difference between before and after maximal strength training  the mean values of throwing accuracy (p<0,05) but there was no significant difference before and after other training programs (p> 0,05). This result indicates that acute maximal strength training has a negative effect on throwing accuracy.

Divergent Performance Outcomes Following Resistance Training Using Repetition Maximums or Relative Intensity

2019 ◽  
Vol 14 (1) ◽  
pp. 46-54 ◽  
Author(s):  
Kevin M. Carroll ◽  
Jake R. Bernards ◽  
Caleb D. Bazyler ◽  
Christopher B. Taber ◽  
Charles A. Stuart ◽  
...  
Keyword(s):  
Resistance Training ◽  
Relative Intensity ◽  
Effect Size ◽  
Vertical Jump ◽  
Force Production ◽  
Performance Outcomes ◽  
Peak Force ◽  
Rate Of Force Development ◽  
Effect Sizes ◽  
Force Development

Purpose: To compare repetition maximum (RM) to relative intensity using sets and repetitions (RISR) resistance training on measures of training load, vertical jump, and force production in well-trained lifters. Methods: Fifteen well-trained (isometric peak force = 4403.61 [664.69] N, mean [SD]) males underwent resistance training 3 d/wk for 10 wk in either an RM group (n = 8) or RISR group (n = 7). Weeks 8 to 10 consisted of a tapering period for both groups. The RM group achieved a relative maximum each day, whereas the RISR group trained based on percentages. Testing at 5 time points included unweighted (<1 kg) and 20-kg squat jumps, countermovement jumps, and isometric midthigh pulls. Mixed-design analyses of variance and effect size using Hedge’s g were used to assess within- and between-groups alterations. Results: Moderate between-groups effect sizes were observed for all squat-jump and countermovement-jump conditions supporting the RISR group (g = 0.76–1.07). A small between-groups effect size supported RISR for allometrically scaled isometric peak force (g = 0.20). Large and moderate between-groups effect sizes supported RISR for rate of force development from 0 to 50 ms (g = 1.25) and 0 to 100 ms (g = 0.89). Weekly volume load displacement was not different between groups (P > .05); however, training strain was statistically greater in the RM group (P < .05). Conclusions: Overall, this study demonstrated that RISR training yielded greater improvements in vertical jump, rate of force development, and maximal strength compared with RM training, which may be explained partly by differences in the imposed training stress and the use of failure/nonfailure training in a well-trained population.

scholarly journals Changes in Overall Participation Profile of Youth with Physical Disabilities Following the PREP Intervention

2020 ◽  
Vol 17 (11) ◽  
pp. 3990
Author(s):  
Colin Hoehne ◽  
Brittany Baranski ◽  
Louiza Benmohammed ◽  
Liam Bienstock ◽  
Nathan Menezes ◽  
...  
Keyword(s):  
Life Experiences ◽  
Physical Disabilities ◽  
Real Life ◽  
Children And Youth ◽  
Effect Sizes ◽  
Special School ◽  
Access To Information ◽  
Environmental Barriers ◽  
Potential Impact ◽  
School Roles

The Pathways and Resources for Engagement and Participation (PREP), an environmental-based intervention, is effective in improving the participation of youth with disabilities in specific targeted activities; however, its potential impact on overall participation beyond these activities is unknown. This study examined the differences in participation levels and environmental barriers and supports following the 12-week PREP intervention. Existing data on participation patterns and environmental barriers and supports, measured by the Participation and Environment Measure for Children and Youth, pre-and post-PREP intervention, were statistically analyzed across 20 youth aged 12 to 18 (mean = 14.4, standard deviation (SD) = 1.82) with physical disabilities in three settings: home, school and community. Effect sizes were calculated using Cohen’s d. Following PREP, youth participated significantly less often at home (d = 2.21; 95% Confidence Interval (CI) [1.79, 2.96]), more often (d = 0.57; 95% CI [−0.79, −0.14]) and in more diverse activities (d = 0.51; 95% CI [−1.99, −0.51]) in the community. At school, significantly greater participation was observed in special school roles (t = −2.46. p = 0.024). Involvement and desire for change remained relatively stable across all settings. A substantial increase in community environmental supports was observed (d = 0.67), with significantly more parents reporting availability of, and access to information as a support (χ2 = 4.28, p = 0.038). Findings lend further support to the effectiveness of environmental-based interventions, involving real-life experiences.

scholarly journals Updated systematic review and meta-analysis of studies examining the relationship between reported racism and health and well-being for children and youth: a protocol

BMJ Open ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. e043722
Author(s):  
Naomi Priest ◽  
Kate Doery ◽  
Mandy Truong ◽  
Shuaijun Guo ◽  
Ryan Perry ◽  
...  
Keyword(s):  
Systematic Review ◽  
Health Outcomes ◽  
Research Policy ◽  
Meta Analysis ◽  
Well Being ◽  
Children And Youth ◽  
Effect Sizes ◽  
Future Research ◽  
Critical Determinant ◽  
Health And Well Being

IntroductionRacism is a critical determinant of health and health inequities for children and youth. This protocol aims to update the first systematic review conducted by Priest et al (2013), including a meta-analysis of findings. Based on previous empirical data, it is anticipated that child and youth health will be negatively impacted by racism. Findings from this review will provide updated evidence of effect sizes across outcomes and identify moderators and mediators of relationships between racism and health.Methods and analysisThis systematic review and meta-analysis will include studies that examine associations between experiences of racism and racial discrimination with health outcomes of children and youth aged 0–24 years. Exposure measures include self-reported or proxy reported systemic, interpersonal and intrapersonal racism. Outcome measures include general health and well-being, physical health, mental health, biological markers, healthcare utilisation and health behaviours. A comprehensive search of studies from the earliest time available to October 2020 will be conducted. A random effects meta-analysis will examine the average effect of racism on a range of health outcomes. Study-level moderation will test the difference in effect sizes with regard to various sample and exposure characteristics. This review has been registered with the International Prospective Register of Systematic Reviews.Ethics and disseminationThis review will provide evidence for future research within the field and help to support policy and practice development. Results will be widely disseminated to both academic and non-academic audiences through peer-review publications, community summaries and presentations to research, policy, practice and community audiences.PROSPERO registration numberCRD42020184055.

Impact of COVID-19 Lockdown on Serie A Soccer Players’ Physical Qualities

2021 ◽  
Author(s):  
Ermanno Rampinini ◽  
Federico Donghi ◽  
Marco Martin ◽  
Andrea Bosio ◽  
Marco Riggio ◽  
...  
Keyword(s):  
Aerobic Fitness ◽  
Mixed Models ◽  
Peak Power ◽  
Vertical Jump ◽  
Soccer Players ◽  
Limited Evidence ◽  
Professional Soccer ◽  
Home Based ◽  
Before And After ◽  
Different Seasons

AbstractIn March 2020, the COVID-19 pandemic forced most activities in Italy, including soccer, to cease. During lockdown, players could only train at home, with limited evidence regarding the effect of this period. Therefore, this study aimed to investigate the effect of COVID-19 lockdown on professional soccer players’ physical performance. Aerobic fitness and vertical jump were assessed before and after four periods in two different seasons: COVID-19 lockdown, competitive period before lockdown, competitive period and summer break of the 2016–2017 season. Linear mixed models were used to examine within-period changes and between-period differences in changes observed during COVID-19 lockdown and the three other periods. Within-period changes in aerobic fitness showed a significant improvement following COVID-19 lockdown (p<0.001) and a significant decline during summer break (p<0.001). Between-period differences were significant in the comparison of COVID-19 lockdown with both the competitive 2019–2020 season (p<0.01) and summer break (p<0.001). For the vertical jump, only the between-period comparison revealed significant differences as the changes associated with COVID-19 lockdown were worse than those of the two competitive periods, for both absolute (p<0.05; p<0.001) and relative peak power (p<0.01; p<0.001). Home-based training during lockdown was effective to improve aerobic fitness, although it did not allow players to maintain their competitive period’s power levels.

Exercise in the Treatment of Claudication: Assessment and Treatment of Functional Impairment

1997 ◽  
Vol 2 (3) ◽  
pp. 238-242 ◽  
Author(s):  
Judith G Regensteiner
Keyword(s):  
Functional Status ◽  
Training Programs ◽  
Meta Analysis ◽  
Exercise Program ◽  
Community Settings ◽  
Before And After ◽  
Assessment And Treatment ◽  
Walking Speeds ◽  
Walking Time ◽  
Efficacy Studies

Claudication is an important cause of impaired exercise capacity, which limits a patient's ability to walk and thus to meet the personal, social and occupational demands of daily life. Given that improvement of the walking impairment is the primary goal of treating claudication, exercise performance and functional status of patients with claudication should be measured before and after any intervention. Assessment of functional status in both the laboratory and community settings is important so that the various treatments can be judged as to relative efficacy. Studies have shown that exercise training programs have a clinically important impact on functional capacity in persons with claudication. A meta-analysis showed that pain-free walking time increased 180% and maximal walking time increased 120% in claudicants who participated in an exercise program. Substantial improvements have been found in walking speeds and distances (65% and 44%, respectively), caloric expenditure (31%) and physical functioning (67%).

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