Effect of Beta-Alanine Supplementation on 800-m Running Performance

2013 ◽  
Vol 23 (6) ◽  
pp. 554-561 ◽  
Author(s):  
Kagan J. Ducker ◽  
Brian Dawson ◽  
Karen E. Wallman
Keyword(s):  
Effect Size ◽  
Exercise Performance ◽  
High Intensity ◽  
Effect Sizes ◽  
Short Term ◽  
Running Performance ◽  
Beta Alanine ◽  
Moderate Effect Size ◽  
Improve Exercise Performance ◽  
Moderate Effect

Beta-alanine supplementation has been shown to improve exercise performance in short-term, high-intensity efforts.Purpose:The aim of this study was to assess if beta-alanine supplementation could improve 800 m track running performance in male recreational club runners (n = 18).Methods:Participants completed duplicate trials (2 presupplementation, 2 postsupplementation) of an 800 m race, separated by 28 days of either beta-alanine (n = 9; 80 mg·kg−1BM·day−1) or placebo (n = 9) supplementation.Results:Using ANCOVA (presupplementation times as covariate), postsupplementation race times were significantly faster following beta-alanine (p = .02), with post- versus presupplementation race times being faster after beta-alanine (–3.64 ± 2.70 s, –2.46 ± 1.80%) but not placebo (–0.59 ± 2.54 s, –0.37 ± 1.62%). These improvements were supported by a moderate effect size (d = 0.70) and a very likely (99%) benefit in the beta-alanine group after supplementation. Split times (ANCOVA) at 400 m were significantly faster (p = .02) postsupplementation in the beta-alanine group, compared with placebo. This was supported by large effect sizes (d = 1.05–1.19) and a very likely (99%) benefit at the 400 and 800 m splits when comparing pre- to postsupplementation with beta-alanine. In addition, the first and second halves of the race were faster post- compared with presupplementation following beta-alanine (1st half –1.22 ± 1.81 s, likely 78% chance of benefit; 2nd half –2.38 ± 2.31 s, d = 0.83, very likely 98% chance of benefit). No significant differences between groups or pre- and postsupplementation were observed for postrace blood lactate and pH.Conclusion:Overall, 28 days of beta-alanine supplementation (80 mg·kg-1BM·day-1) improved 800 m track performance in recreational club runners.

Quiet Eye and Performance in Sport: A Meta-Analysis

2016 ◽  
Vol 38 (5) ◽  
pp. 441-457 ◽  
Author(s):  
Jean-Charles Lebeau ◽  
Sicong Liu ◽  
Camilo Sáenz-Moncaleano ◽  
Susana Sanduvete-Chaves ◽  
Salvador Chacón-Moscoso ◽  
...  
Keyword(s):  
Effect Size ◽  
Meta Analysis ◽  
Effect Sizes ◽  
Subsequent Performance ◽  
Quiet Eye ◽  
Performance Effects ◽  
Moderate Effect Size ◽  
Moderate Effect ◽  
And Performance ◽  
Absolute Duration

Research linking the “quiet eye” (QE) period to subsequent performance has not been systematically synthesized. In this paper we review the literature on the link between the two through nonintervention (Synthesis 1) and intervention (Synthesis 2) studies. In the first synthesis, 27 studies with 38 effect sizes resulted in a large mean effect (d = 1.04) reflecting differences between experts’ and novices’ QE periods, and a moderate effect size (d = 0.58) comparing QE periods for successful and unsuccessful performances within individuals. Studies reporting QE duration as a percentage of the total time revealed a larger mean effect size than studies reporting an absolute duration (in milliseconds). The second synthesis of 9 articles revealed very large effect sizes for both the quiet-eye period (d = 1.53) and performance (d = 0.84). QE also showed some ability to predict performance effects across studies.

School-Based High-Intensity Interval Training Programs for Promoting Physical Activity and Fitness in Adolescents: A Systematic Review

2021 ◽  
pp. 1-13
Author(s):  
André Filipe Paulino da Silva Bento ◽  
Luis Carrasco Páez ◽  
Armando Manuel de Mendonça Raimundo
Keyword(s):  
Physical Activity ◽  
Physical Education ◽  
Physical Fitness ◽  
Effect Size ◽  
High Intensity ◽  
Interval Training ◽  
High Intensity Interval Training ◽  
Moderate Effect Size ◽  
Moderate Effect ◽  
High Intensity Interval

Purpose: This review aimed to evaluate the utility of high-intensity interval training (HIIT) programs integrated into physical education classes. Method: Searches of electronic databases from January 2008 to March 2020. Inclusion criteria: Applied to adolescents aged 10–19 years; applied in school settings; reported results on physical fitness, physical activity (PA), and motivation; at least for 4 weeks; and randomized controlled trials. Studies with adolescents with physical or intellectual limitations were excluded, as well as other interventions parallel to HIIT. Results: Fourteen studies were included. All works present significant improvements in physical fitness and PA. Improvements in body composition recorded, at most, a moderate effect size. HIIT is presented as a powerful stimulus on cardiorespiratory fitness. Improvements in PA registered, a least, a moderate effect size. Conclusions: HIIT in the school context has great potential in improving physical fitness and PA in adolescents. HIIT efficiency (about 10 min) reflects the wide applicability that these protocols can have in physical education classes and great adaptation to the facilities.

scholarly journals Influence of Aerobic Power on Youth Players’ Tactical Behavior and Network Properties during Football Small-Sided Games

Sports ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 73 ◽  
Author(s):  
Gibson Moreira Praça ◽  
Raphael Brito e Sousa ◽  
Pablo Juan Greco
Keyword(s):  
Effect Size ◽  
Aerobic Power ◽  
Team Sports ◽  
Clustering Coefficient ◽  
Effect Sizes ◽  
Power Group ◽  
Moderate Effect Size ◽  
Network Properties ◽  
Moderate Effect ◽  
Macro Variables

(1) Background: This study aimed to compare the incidence of tactical principles, the percentage of successful tactical principles, and the network properties between higher and lower aerobic power in young football players during small-sided games. (2) Methods: Eighteen Under-17 Brazilian players were recruited. Firstly, they performed the Yo-Yo Intermittent Recovery Test Level 2, which was used to split them into two groups with higher and lower aerobic power. In the sequence, they played three vs three small-sided games within each group. The System of Tactical Assessment in Soccer was used to analyze the tactical behavior demonstrated by measuring the incidence of tactical principles and the percentage of successful principles, while the macro variables, density and clustering coefficient from social network analysis for team sports was used to analyze players’ interactions. (3) Results: No differences were reported for the incidence of tactical principles (p > 0.05, small or small-to-moderate effect sizes), the percentage of successful offensive principles (p = 0.122, small-to-moderate effect size), or the network variables (p > 0.05; small effect sizes). The lower aerobic power group demonstrated a higher percentage of successful defensive tactical principles (p = 0.043; small-to-moderate effect size). (4) Conclusions: We concluded that aerobic power has a limited impact on player behavior, indicating that players’ actions within a small-sided game are mostly constrained by other parameters.

Effects of manual acupuncture and electroacupuncture for lateral epicondylalgia of musculoskeletal origin: a systematic review and meta-analysis

2020 ◽  
pp. 096452842096736
Author(s):  
Marcos J Navarro-Santana ◽  
Jorge Sanchez-Infante ◽  
Guido F Gómez-Chiguano ◽  
Mike Cummings ◽  
César Fernández-de-las-Peñas ◽  
...  
Keyword(s):  
Pain Intensity ◽  
Effect Size ◽  
Randomized Clinical Trials ◽  
Meta Analysis ◽  
Short Term ◽  
Positive Effects ◽  
Small Effect Size ◽  
Lateral Epicondylalgia ◽  
Moderate Effect Size ◽  
Moderate Effect

Objective: The aim of this study was to evaluate the effect of acupuncture/electroacupuncture, alone or combined with other interventions, on pain intensity, pain-related disability, and strength in lateral epicondylalgia (LE) of musculoskeletal origin. Databases and data treatment: Electronic databases were searched for randomized clinical trials, where at least one group received acupuncture or electroacupuncture for LE of musculoskeletal origin. To be eligible, trials had to include humans and collect outcomes on pain intensity or pain-related disability in LE. Data were extracted by two reviewers. The risk of bias (RoB) of the trials was assessed using the Cochrane RoB tool, methodological quality was assessed with the Physiotherapy Evidence Database (PEDro) score, and the level of evidence was summarized using the Grading of Recommendations Assessment, Development, and Evaluation (GRADE). Standardized mean differences (SMDs) using random effects were calculated. Results: A total of 14 trials (10 acupuncture) were included. The meta-analysis found a moderate effect size of acupuncture (SMD = −0.66, 95% confidence interval (CI) = −1.22 to −0.10), but not electroacupuncture (SMD = −0.08, 95% CI = −0.99 to 0.83), in the reduction of elbow pain as compared to a comparative group. Acupuncture exhibited a significant moderate effect size (SMD = −0.51, 95% CI = −0.91 to −0.11) in the improvement of related-disability. Acupuncture (SMD = 0.36, 95% CI = 0.16 to 0.57), but not electroacupuncture (SMD = 0.34, 95% CI = −0.29 to 0.98), exhibited a significant but small effect size on strength. Most significant effects were in the short term. The RoB was low but the heterogeneity of trial results led to a downgrading of the GRADE evidence level. Conclusion: Low-level evidence suggests positive effects of acupuncture, but not electroacupuncture, for pain, related-disability, and strength, in LE of musculoskeletal origin, in the short term.

scholarly journals Specific Absolute Velocity Thresholds during Male Basketball Games Using Local Positional System; Differences between Age Categories

2021 ◽  
Vol 11 (10) ◽  
pp. 4390
Author(s):  
Carlos Sosa ◽  
Alberto Lorenzo ◽  
Juan Trapero ◽  
Carlos Ribas ◽  
Enrique Alonso ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Real Time ◽  
Effect Size ◽  
High Speed ◽  
Maximum Speed ◽  
Large Effect Size ◽  
Moderate Effect Size ◽  
Positional System ◽  
Moderate Effect ◽  
Distance Zone

The aim of this study was (I) to establish absolute specific velocity thresholds during basketball games using local positional system (LPS) and (II) to compare the speed profiles between various levels of competitions. The variables recorded were total distance (TD); meters per minute (m·min); real time (min); maximum speed (Km h−1), distance (m), percentage distance, and percentage duration invested in four speed zones (standing–walking; jogging; running; and high-speed running). Mean and standard deviation (±SD) were calculated, and a separate one-way analysis of variance was undertaken to identify differences between competitions. TD (3188.84 ± 808.37 m) is covered by standing–walking (43.51%), jogging (36.58%), running (14.68%), and sprinting (5.23%) activities. Overall, 75.22% of the time is invested standing–walking, jogging (18.43%), running (4.77%), and sprinting (1.89%). M·min (large effect size), % duration zone 2 (moderate effect size); distance zone 4 (large effect size), and % distance zone 4 (very large effect size) are significantly higher during junior than senior. However, % distance zone 1 (large effect size) and % duration zone 1 (large effect size) were largely higher during senior competition. The findings of this study reveal that most of the distance and play time is spent during walking and standing activities. In addition, the proportion of time spent at elevated intensities is higher during junior than in senior competition.

scholarly journals Targeting Turkish-to-English Interlingual Interference Through Context-Heavy Data-Driven Learning

SAGE Open ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 215824402092059 ◽  
Author(s):  
Keith John Lay ◽  
Mehmet Ali Yavuz
Keyword(s):  
Search Engine ◽  
Effect Size ◽  
First Language ◽  
Significant Degree ◽  
Data Driven ◽  
Step Process ◽  
Hands On ◽  
Moderate Effect Size ◽  
Moderate Effect ◽  
Grammar Development

This study investigates the effect of grammar-focused hands-on in-class data-driven learning (DDL) with a heavily contextualized corpus on the frequency of written errors attributable to common interlingual interference issues in low–intermediate Turkish learners ( n = 30) of English. Items representing the most common Turkish-to-English interlingual errors were selected through a two-step process involving the analysis of past studies and a subsequent ranking survey of teachers ( n = 10) of Turkish learners of English. Participants’ grammar development in terms of types of written errors was measured over a ten-week period through written tasks in a pre/posttest design, producing 19,328 words for analysis. The results, although variable by item, suggest that targeted DDL with the TED Corpus Search Engine (TCSE) helps reduce written errors in Turkish learners of English to a significant degree with a moderate effect size. Consequently, the investigation of DDL with the TCSE for the targeting of interlingual interference in other first-language contexts is recommended.

Age and Sex Differences in Representation of Horizontality among Children in India

1989 ◽  
Vol 68 (3) ◽  
pp. 739-746 ◽  
Author(s):  
Richard de Lisi ◽  
Gowri Parameswaran ◽  
Ann V. McGillicuddy-Delisi
Keyword(s):  
Sex Differences ◽  
Individual Differences ◽  
Water Level ◽  
Effect Size ◽  
Fourth Graders ◽  
Ninth Graders ◽  
Female Adolescents ◽  
Moderate Effect Size ◽  
Moderate Effect ◽  
Age And Sex

Girls and boys from Grades 4 ( ns = 15) and 9 ( ns = 15 and 16) in Bombay, India were individually administered water-level and crossbar assessments of horizontality representation. Ninth graders were more successful than fourth graders, especially on trials in which the apparatus was obliquely rotated. Ninth graders, however, did not perform at ceiling levels, and a sex difference with a moderate effect size favoring male over female adolescents was obtained for the water-level task. These findings of both developmental and individual differences in horizontality performance replicate previous findings in Western cultures.

Effects of Short-Term Creatine Monohydrate Supplementation on High Intensity, Anaerobic Exercise Performance

2006 ◽  
Vol 38 (Supplement) ◽  
pp. S406
Author(s):  
John W. Womack ◽  
Adam G. Parker ◽  
Benjamin J. Head ◽  
John S. Green ◽  
Stephen F. Crouse
Keyword(s):  
Exercise Performance ◽  
High Intensity ◽  
Creatine Monohydrate ◽  
Anaerobic Exercise ◽  
Short Term

Influence of Physical Contact on Pacing Strategies During Game-Based Activities

2014 ◽  
Vol 9 (5) ◽  
pp. 811-816 ◽  
Author(s):  
Rich D. Johnston ◽  
Tim J. Gabbett ◽  
Anthony J. Seibold ◽  
David G. Jenkins
Keyword(s):  
Effect Size ◽  
High Intensity ◽  
High Speed ◽  
Rugby League ◽  
Physical Contact ◽  
Running Performance ◽  
Low Speed ◽  
Pacing Strategies ◽  
Group 2 ◽  
Group 1

Purpose:Repeated sprinting incorporating tackles leads to greater reductions in sprint performance than repeated sprinting alone. However, the influence of physical contact on the running demands of game-based activities is unknown. The aim of this study was to determine whether the addition of physical contact altered pacing strategies during game-based activities.Methods:Twenty-three elite youth rugby league players were divided into 2 groups. Group 1 played the contact game on day 1 while group 2 played the noncontact game; 72 h later they played the alternate game. Each game consisted of offside touch on a 30 × 70-m field, played over two 8-min halves. Rules were identical between games except the contact game included a 10-s wrestle bout every 50 s. Microtechnology devices were used to analyze player movements.Results:There were greater average reductions during the contact game for distance (25%, 38 m/min, vs 10%, 20 m/min; effect size [ES] = 1.78 ± 1.02) and low-speed distance (21%, 24 m/min, vs 0%, 2 m/s; ES = 1.38 ± 1.02) compared with the noncontact game. There were similar reductions in high-speed running (41%, 18 m/min, vs 45%, 15 m/min; ES = 0.15 ± 0.95).Conclusions:The addition of contact to game-based activities causes players to reduce low-speed activity in an attempt to maintain high-intensity activities. Despite this, players were unable to maintain high-speed running while performing contact efforts. Improving a player’s ability to perform contact efforts while maintaining running performance should be a focus in rugby league training.

Sign in / Sign up

Export Citation Format

Share Document