scholarly journals The effects of BCAA and creatine supplementation on anaerobic capacity and ball kicking speed in male football players

2021 ◽  
Keyword(s):  
Peak Power ◽  
Average Power ◽  
Anaerobic Capacity ◽  
Creatine Supplementation ◽  
Football Players ◽  
Performance Tests ◽  
Fatigue Index ◽  
Tests And Measurements ◽  
Before And After ◽  
Branched Chain

Background and objective: The use of nutritional supplements has increased in recent years. This study analyzes the effects of Branched-Chain Amino Acids (BCAA) and creatine (CR) supplementation on anaerobic capacity and ball kicking speed in football players. Material and methods: 24 volunteer-active male amateur football players between 18--26 were recruited for this study. Football players were randomly divided into three groups as BCAA (n = 8), CR (n = 8), and placebo (PLA) (n = 8). Experimental groups were given 5 g BCAA and 2 g creatine before and after exercise, whereas the placebo group ingested bran, performance tests and measurements were performed, and results were assessed. Results: BCAA group average power (pre: 530.70 ± 53.73 W vs. post: 567.65 ± 66.68 W; p = 0.028), CR group minimum power (pre: 413.75 ± 51.13 W vs. post: 462.82 ± 71.93 W; p = 0.043) increased, while there were decreases in peak power (pre: 659.34 ± 121.03 W vs. post: 613.20 ± 124.24 W; p = 0.043) and fatigue index (pre: 6.55 ± 2.12 W/s vs. post: 4.34 ± 2.37 W/s; p = 0.043) parameters of PLA group (p < 0.05). There were statistically significant differences in the BCAA group in rest, pre-and post-supplementation; CR group in pre-and post-supplementation; PLA group in rest, pre-and post-supplementation (p < 0.05). Conclusions: BCAA and creatine consumption do not affect recovery rates in football players regarding obtained data. But, regarding other findings of this study, BCAA and creatine supplementation improves anaerobic capacity, provides strength endurance against fatigue, and prevents the decrement of ball-kicking speed in exhaustion.

scholarly journals The effects of phosphocreatine disodium salts plus blueberry extract supplementation on muscular strength, power, and endurance

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
John Paul V. Anders ◽  
Tyler J. Neltner ◽  
Robert W. Smith ◽  
Joshua L. Keller ◽  
Terry J. Housh ◽  
...  
Keyword(s):  
Placebo Group ◽  
Exercise Performance ◽  
Muscular Strength ◽  
Minimal Important Difference ◽  
Average Power ◽  
Creatine Supplementation ◽  
Peak Torque ◽  
Before And After ◽  
Group A ◽  
Percent Decline

Abstract Background Numerous studies have demonstrated the efficacy of creatine supplementation for improvements in exercise performance. Few studies, however, have examined the effects of phosphocreatine supplementation on exercise performance. Furthermore, while polyphenols have antioxidant and anti-inflammatory properties, little is known regarding the influence of polyphenol supplementation on muscular strength, power, and endurance. Thus, the purpose of the present study was to compare the effects of 28 days of supplementation with phosphocreatine disodium salts plus blueberry extract (PCDSB), creatine monohydrate (CM), and placebo on measures of muscular strength, power, and endurance. Methods Thirty-three men were randomly assigned to consume either PCDSB, CM, or placebo for 28 days. Peak torque (PT), average power (AP), and percent decline for peak torque (PT%) and average power (AP%) were assessed from a fatigue test consisting of 50 maximal, unilateral, isokinetic leg extensions at 180°·s− 1 before and after the 28 days of supplementation. Individual responses were assessed to examine the proportion of subjects that exceeded a minimal important difference (MID). Results The results demonstrated significant (p < 0.05) improvements in PT for the PCDSB and CM groups from pre- (99.90 ± 22.47 N·m and 99.95 ± 22.50 N·m, respectively) to post-supplementation (119.22 ± 29.87 N·m and 111.97 ± 24.50 N·m, respectively), but no significant (p = 0.112) change for the placebo group. The PCDSB and CM groups also exhibited significant improvements in AP from pre- (140.18 ± 32.08 W and 143.42 ± 33.84 W, respectively) to post-supplementation (170.12 ± 42.68 W and 159.78 ± 31.20 W, respectively), but no significant (p = 0.279) change for the placebo group. A significantly (p < 0.05) greater proportion of subjects in the PCDSB group exceeded the MID for PT compared to the placebo group, but there were no significant (p > 0.05) differences in the proportion of subjects exceeding the MID between the CM and placebo groups or between the CM and PCDSB groups. Conclusions These findings indicated that for the group mean responses, 28 days of supplementation with both PCDSB and CM resulted in increases in PT and AP. The PCDSB, however, may have an advantage over CM when compared to the placebo group for the proportion of individuals that respond favorably to supplementation with meaningful increases in muscular strength.

Catchlike-inducing train activation of human muscle during isotonic contractions: burst modulation

1999 ◽  
Vol 87 (5) ◽  
pp. 1758-1767 ◽  
Author(s):  
Samuel C. K. Lee ◽  
Cara N. Becker ◽  
Stuart A. Binder-Macleod
Keyword(s):  
Isometric Contraction ◽  
Peak Power ◽  
Average Power ◽  
Knee Extension ◽  
Human Muscle ◽  
Constant Frequency ◽  
Maximum Voluntary Isometric Contraction ◽  
Before And After ◽  
Isotonic Performance ◽  
Isotonic Contractions

Stimulation trains that exploit the catchlike property [catchlike-inducing trains (CITs)] produce greater forces and rates of rise of force than do constant-frequency trains (CFTs) during isometric contractions and isovelocity movements. This study examined the effect of CITs during isotonic contractions in healthy subjects. Knee extension was electrically elicited against a load of 10% of maximum voluntary isometric contraction. The stimulation intensity was set to produce 20% of maximum voluntary isometric contraction. The muscle was tested before and after fatigue with a 6-pulse CFT and 6-pulse CITs that contained an initial doublet, triplet, or quadruplet. For prefatigue responses, the greatest isotonic performance was produced by CITs with initial doublets. When the muscles were fatigued, triplet CITs were best. CITs produce greater excursion, work, peak power, and average power than do CFTs, because CITs produced more rapid rates of rise of force. Faster rates of rise of force enabled the preload on the muscle to be exceeded earlier during the stimulation train.

Effect of Wingate Start Procedure on Peak Power, Average Power, and Fatigue Index

2014 ◽  
Vol 46 ◽  
pp. 833
Author(s):  
Taylor S. Thurston ◽  
Anthony B. Ciccone ◽  
Xavier Avila ◽  
Barry A. Spiering ◽  
Daniel A. Judelson
Keyword(s):  
Peak Power ◽  
Average Power ◽  
Fatigue Index

scholarly journals Interlimb asymmetry thresholds that negatively affect change of direction performance in collegiate American football players

2020 ◽  
Author(s):  
Nicolas Philipp ◽  
Derek Crawford ◽  
Matthew Garver ◽  
Dustin Davis ◽  
Josie Hair
Keyword(s):  
Peak Power ◽  
Operating Characteristic ◽  
Average Power ◽  
Roc Curves ◽  
Sport Performance ◽  
American Football ◽  
Football Players ◽  
Strength And Conditioning ◽  
Impact Performance ◽  
Change Of Direction

Purpose: Investigations into the effects of interlimb asymmetries on different aspects of sport performance have been of increased interest to researchers and strength and conditioning practitioners over the past couple of years. Interlimb asymmetries have been found to negatively impact performance in key performance indicators (KPI) such as jumping, sprinting, and changing directions, within various sports populations. However, there is no consensus with regard to a meaningful threshold at which asymmetries start to negatively impact KPIs or performance. The aim of this study was to investigate a potentially meaningful threshold for three asymmetry metrics (mean peak velocity (mPV), mean peak power (mPP), mean average power (mAP)) that were extracted from the Bulgarian split squat and found to be significantly related to change of direction performance (via L-drill test) within a sample of collegiate American football players. Methods: We used receiver operating characteristic (ROC) curves to identify asymmetry thresholds for all metrics that discriminate between faster and slower performers in the L-drill. Results: Asymmetry thresholds of greater than 10.65% (mAP), 14.59% (MPP), and 14.96% (mPV) were the thresholds identified by ROC curves as approximately 15% for both metrics, whereby players with asymmetries over this threshold were more likely to be classified as low performers. Conclusion: These findings may be helpful for practitioners interested in screening athletes for interlimb asymmetries that may negatively impact their change of direction performance.

Effect of oral creatine supplementation on power output and fatigue during bicycle ergometry

1995 ◽  
Vol 78 (2) ◽  
pp. 670-673 ◽  
Author(s):  
W. H. Cooke ◽  
P. W. Grandjean ◽  
W. S. Barnes
Keyword(s):  
Power Output ◽  
High Intensity ◽  
Peak Power ◽  
Creatine Supplementation ◽  
Total Work ◽  
Fatigue Index ◽  
Bicycle Ergometry ◽  
Double Blind ◽  
Mean Values ◽  
Time To Peak

Our purpose was to determine the effect of oral creatine supplementation on exercise performance during high-intensity short-duration bicycle sprinting. Power output was recorded for 12 healthy untrained males (age 24.08 +/- 0.53 yr, weight 81.22 +/- 1.32 kg) before and after 5 days of creatine (n = 6) or placebo (n = 6) supplementation. A double-blind research design was employed. Subjects performed maximal sprints against a constant load (111.8 N) for 15 s. Each one-half pedal revolution was magnetically counted, and subsequent measurements of peak power, time to peak power, total work, and the fatigue index were digitized and stored on disk. Mean values for peak power, time to peak power, total work, and fatigue index were 958.01 +/- 40.66 W, 4.09 +/- 0.82 s, 11.28 +/- 0.46 kJ, and 32.1 +/- 1.58% decline from peak power, respectively. No significant differences were observed within or between groups before or after supplementation for any of the mechanical parameters measured (P > 0.05). These findings suggest that oral creatine supplementation does not positively affect power output or fatigue during continuous high-intensity bicycle exercise in untrained men.

scholarly journals Pulsed Shortwave Diathermy and Joint Mobilizations for Achieving Normal Elbow Range of Motion After Injury or Surgery With Implanted Metal: A Case Series

2014 ◽  
Vol 49 (6) ◽  
pp. 851-855 ◽  
Author(s):  
David O. Draper
Keyword(s):  
Range Of Motion ◽  
Peak Power ◽  
Average Power ◽  
Case Series ◽  
Normal Extension ◽  
Therapeutic Modalities ◽  
Active Range Of Motion ◽  
Before And After ◽  
Cubital Fossa ◽  
Shortwave Diathermy

Context: Regaining full, active range of motion (ROM) after trauma to the elbow is difficult. Objective: To report the cases of 6 patients who lacked full ROM in the elbow because of trauma. The treatment regimen was thermal pulsed shortwave diathermy and joint mobilizations. Design: Case series. Setting: University therapeutic modalities laboratory. Patients or Other Participants: Six patients (5 women [83%], 1 man [17%]) lacked a mean active ROM of 24.5° of extension approximately 4.8 years after trauma or surgery. Intervention(s): Treatment consisted of 20 minutes of pulsed shortwave diathermy at 800 pulses per second for 400 microseconds (40–48 W average power, 150 W peak power) applied to the cubital fossa, immediately followed by 7 to 8 minutes of joint mobilizations. After posttreatment ROM was recorded, ice was applied to the area for about 30 minutes. Main Outcomes Measure(s): Changes in extension active ROM were assessed before and after each treatment. Once the patient achieved full, active ROM or failed to improve on 2 consecutive visits, he or she was discharged from the study. Results: By the fifth treatment, 4 participants (67%) achieved normal extension active ROM, and 2 of the 4 (50%) exceeded the norm. Five participants (83%) returned to normal activities and full use of their elbows. One month later, the 5 participants had maintained, on average, (mean ± SD) 92% ± 6% of their final measurements. Conclusions: A combination of thermal pulsed shortwave diathermy and joint mobilizations was effective in restoring active ROM of elbow extension in 5 of the 6 patients (83%) who lacked full ROM after injury or surgery.

scholarly journals Anaerobic Capacity Changes of the National Freestyle Wrestlers during the Olympic Qualification Competition Period

2017 ◽  
Vol 5 (8) ◽  
pp. 26
Author(s):  
Ozan Sever ◽  
Süleyman Gönülateş ◽  
Akan Bayrakdar ◽  
Bilal Demirhan ◽  
Serdar Geri ◽  
...  
Keyword(s):  
Repeated Measures ◽  
National Level ◽  
Average Power ◽  
Anaerobic Capacity ◽  
Peak Level ◽  
Power Weight ◽  
Jump Height ◽  
Fatigue Index ◽  
Mean Power ◽  
Jump Test

This study aimed to evaluate the national level wrestlers’ anaerobic capacity through the preparation and qualification periods for Rio 2016 summer Olympic Games. For this manner, 10 national level freestyle wrestlers’(age 22,10 ± 3,21; weight 64,75 ±6,34; height 164,31 ± 4,75) anaerobic outputs measured 3 times in three month intervals with Bosco repeated jump test. Peak Jump(cm), Flight time, average power, average power/weight, first 15sec average jump height, last 15sec average jump height, fatigue index scores analyzed with repeated measures Anova. Mean power/weight output of the wrestlers increased from 20,42 W/kg to 21,28 W/kg(4,21 %) and fatigue index is decreased from 1,185 to 1,142 (3,62 %). However, this increase was not statistically significant (p<0,05). In six months of qualification and preparation period wrestlers’ anaerobic capacity did not changed and it is thought to have been caused by some reasons such as having already reached a certain anaerobic peak level or athletes’ competition level and frequency which might made it difficult for them to have a proper periodization during the year.

scholarly journals Repeated anaerobic tests predict performance among a group of advanced CrossFit-trained athletes

2019 ◽  
Vol 44 (7) ◽  
pp. 727-735 ◽  
Author(s):  
Yuri Feito ◽  
Michael J. Giardina ◽  
Scotty Butcher ◽  
Gerald T. Mangine
Keyword(s):  
High Intensity ◽  
Peak Power ◽  
Respiratory Exchange Ratio ◽  
Physiological Responses ◽  
Average Power ◽  
Physical Parameters ◽  
Active Recovery ◽  
Fatigue Index ◽  
Acute Bout ◽  
Advanced Level

High-intensity functional training (HIFT) (i.e., CrossFit (CF) training) uses a combination of movements and self-selected time periods of work and rest. However, little is known about the physiological responses to an acute bout of HIFT exercise or about the physical parameters that distinguish performance. The purpose of this study was to examine the physiological responses in advanced CF athletes to consecutive Wingate trials with short, active recovery periods. Twenty-nine advanced-level CF-trained athletes volunteered for this study. The participants were required to complete 4 consecutive Wingate anaerobic tests (WAnTs) and a 15-min CF-style workout. Across the 4 WAnT trials, significant (p < 0.001) changes were observed in oxygen consumption, respiratory exchange ratio, and heart rate. Significant (p ≤ 0.001) differences among WAnT trials were observed in all anaerobic performance measures. Compared with all other trials, greater peak power (p < 0.04), relative peak power (p < 0.02), average power (p < 0.001), relative average power (p < 0.001), and total work (p < 0.001), together with a lower fatigue index (p < 0.01), were observed during WAnT 1. Overall, the 4 consecutive WAnT trials resulted in a significant (F = 177.0, p < 0.001) increase in blood lactate response. Stepwise regression revealed that the ability to predict total repetitions completed during the 15-min trial to complete as many repetitions as possible improved as the participants progressed from the first to the third WAnT trial. Our data suggest that, combined with the ability to better maintain performance across high-intensity exercise bouts, the ability to quickly recover between bouts is the most important factor in CF performance.

Effect of Creatine Supplementation on Aerobic Performance and Anaerobic Capacity in Elite Rowers in the Course of Endurance Training

2003 ◽  
Vol 13 (2) ◽  
pp. 173-183 ◽  
Author(s):  
Jolanta Chwalbiñska-Moneta
Keyword(s):  
Endurance Training ◽  
Lactate Threshold ◽  
Anaerobic Capacity ◽  
Creatine Supplementation ◽  
Anaerobic Exercise ◽  
Aerobic Performance ◽  
Anaerobic Performance ◽  
Exercise Tests ◽  
Before And After ◽  
Elite Rowers

The effect of oral creatine supplementation on aerobic and anaerobic performance was investigated in 16 elite male rowers during 7-day endurance training. Before and after the daily ingestion of 20 g creatine monohydrate for 5 days (Cr-Group, n = 8) or placebo (Pl-Group, n = 8), subjects performed two exercise tests on a rowing ergometer: (a) incremental exercise consisting of 3-min stage durations and increased by 50 W until volitional exhaustion; (b) an all-out anaerobic exercise performed against a constant load of 7 W/kg. Heart rate and blood lactate concentrations were determined during exercise and recovery. Maximal power output did not significantly differ after the treatment in either group. The mean individual lactate threshold rose significantly after Cr treatment from 314.3 ± 5.0 W to 335.6 ± 7.1 W (p < .01), as compared with 305.0 ± 6.9 W and 308.9 ± 5.9 W (ns), before and after placebo ingestion, respectively. During the anaerobic test, the athletes supplemented with creatine were able to continue rowing longer (mean increase, 12.1 ± 4.5 s; p < .01) than Pl-Group (2.4 ± 8.2 s; ns). No significant differences were found between groups in blood LA after the all-out exercise. The results indicate that in elite rowers, creatine supplementation improves endurance (expressed by the individual lactate threshold) and anaerobic performance, independent of the effect of intensive endurance training.

scholarly journals The Estimation of the RAST Test Usefulness in Monitoring the Anaerobic Capacity of Sprinters in Athletics

2011 ◽  
Vol 18 (3) ◽  
pp. 214-218 ◽  
Author(s):  
Jakub Adamczyk
Keyword(s):  
High Speed ◽  
Average Power ◽  
Anaerobic Capacity ◽  
Wingate Test ◽  
Maximum Power ◽  
Physical Load ◽  
Fatigue Index ◽  
Regular Monitoring ◽  
Significant Dependence ◽  
Capacity Level

The Estimation of the RAST Test Usefulness in Monitoring the Anaerobic Capacity of Sprinters in AthleticsIntroduction. In athletic high-speed-forced competitions one of basic monitored parameters of the preparation is the level of the anaerobic capacity. The aim of the work was the qualification of the usefulness of the RAST (Running-based Anaerobic Sprint Test) in the estimation of the anaerobic capacity of athletes of sprint athletic competitions. Material and methods. 37 athletes (12 Female and 25 Male) specializing in sprint racing (100 m, 100 m hurdles, 110 m hurdles, 200 m) and the prolonged sprint (400 m and 400 m hurdles) partook in the research. The anaerobic capacity was evaluated by means of the RAST test and the Wingate test. Results. In the RAST test competitors obtained significantly higher values of the maximum power (p<0.001) and the average power (p<0.001), with relation to the Wingate test. Among women such dependences were not ascertained. The fundamentally lower (p<0.001) fatigue index in the RAST test characterized in turn both groups, which can testify about the better adaptation to the run effort. For both tests one ascertained significant dependence between the average power and the maximum power. Moreover, the significant dependence between the fatigue index (FI) and the average and maximum power in the Wingate test was shown. For the RAST test such dependence appeared among FI, and the maximum power. Conclusions. The RAST test gave statistically comparable results only in the case of the average and maximum power among women. The smaller physical load for competitors and decidedly easier organization of the research causes that the RAST test can be used for regular monitoring of the anaerobic capacity level of competitors of athletic run competitions.

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