scholarly journals SOME ASPECTS OF THE ASSESSMENT OF ANAEROBIC CAPACITY IN COMBAT ATHLETES

2019 ◽  
Vol 19 (3) ◽  
pp. 80-87
Author(s):  
F Zotova ◽  
F Mavliev ◽  
A Nazarenko ◽  
I Zemlenukhin ◽  
O Razzhivin
Keyword(s):  
Peak Power ◽  
Average Power ◽  
Anaerobic Capacity ◽  
Shoulder Girdle ◽  
Chest Circumference ◽  
Time To Peak ◽  
Arm Ergometer ◽  
Shoulder Girdle Muscles ◽  
The Moment ◽  
Flexion And Extension

Aim. The article deals with the assessment of anaerobic capacity in wrestlers depending on wrestling style and morphological indicators. Materials and methods. 33 male wrestlers participated in the experiment. All participants are apparently healthy people at the moment of the study and have their sports grades (from 1st grade to the Master of Sport). The test was conducted with the Monark 891E arm ergometer (Switzerland). The following parameters were obtained during the experiment: peak power (W), average power (W), time to peak power (ms). Results. Power was assessed with an arm ergometer. This power is mostly achieved by the muscles responsible for arm flexion and extension in the shoulder joint and, to a lesser extent, by the biceps and triceps responsible for flexion and extension in the elbow joint. This statement is based on the correlations between the peak power, average power, and chest circumference, which look as following: r = 0.58 ± 0.019 (р = 0.0006) and r = 0.68 ± 0.15 (р < 0.0001). At the same time, shoulder circumference is less correlated with power, while chest circumference correlates with the average power in a more pronounced way than body weight does (r = 0.68 ± 0.15 against r = 0.58 ± 0.19, at р = 0.049 – one-way analysis). Therefore, in wrestlers, it is necessary to take into account chest circumference, which will allow predicting the potential power of the locomotion connected with the shoulder girdle (in case if the test is adjusted to a specific wrestling style), as well as  the degree of shoulder girdle muscles development and training as one of the important predictors of successful combat. Conclusion. There are statistically significant correlations between the morphological indicators of wrestlers and their power. This can be used for the assessment of motor qualities depending on chest circumference, shoulder circumference, and skin-fat folds. It will be helpful for estimating a potential power and the efficiency of the training process as one of the main predictors of successful combat, especially at the first stages of multiyear training.

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.

No Improvement in Sprint Performance With a Neuromuscular Fitted Dental Splint

2017 ◽  
Vol 12 (3) ◽  
pp. 414-417 ◽  
Author(s):  
Henrike Fischer ◽  
Daniel Weber ◽  
Ralph Beneke
Keyword(s):  
Peak Power ◽  
Average Power ◽  
Sprint Performance ◽  
Wingate Anaerobic Test ◽  
Time To Peak ◽  
Coefficients Of Variation ◽  
Power Peak ◽  
Mouth Guards ◽  
Performance Results ◽  
Dental Injuries

Mouth guards protect against orofacial and dental injuries in sports. However, special fitted dental splints have been claimed to improve strength and speed and, therefore, to enhance athletic performance.Purpose:To test the effects of a neuromuscular fitted dental splint in comparison with a habitual verticalizing splint and a no-splint condition on cycling sprint performance in the Wingate Anaerobic Test (WAnT).Methods:Twenty-three men (26.0 ± 2.0 y, 1.82 ± 0.06 m, 79.4 ± 7.7 kg) performed 3 WAnTs, 1 with the neuromuscular fitted splint, 1 with a habitual verticalized dental splint of the same height and material, and 1 under control conditions without any mouth guard, in randomized order separated by 1 wk.Results:No differences between any splint conditions were found in any aspect of WAnT performance (time to peak power, peak power, minimum power, power drop, and average power). Moderate to nearly perfect correlations between all splint conditions in all WAnT outcomes with coefficients of variation between 1.3% and 6.6% were found.Conclusions:Irrespective of habitual verticalization or myocentric positioning, dental splints have no effects on any aspect of WAnT performance. Results are comparable to those of test–retest experiments.

scholarly journals AB0862-HPR THE RELATIONSHIP BETWEEN ANAEROBIC EXERCISE CAPACITY AND LOWER EXTREMITY FUNCTIONALITY IN PATIENTS WITH FAMILIAL MEDITERRANEAN FEVER

2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 1454.2-1455
Author(s):  
M. E. Acar ◽  
D. Bayraktar ◽  
S. Gucenmez ◽  
D. C. Saraç ◽  
N. Buker ◽  
...  
Keyword(s):  
Familial Mediterranean Fever ◽  
Lower Extremity ◽  
Functional Status ◽  
Exercise Capacity ◽  
Peak Power ◽  
Average Power ◽  
Anaerobic Capacity ◽  
Anaerobic Exercise ◽  
Walking Distance ◽  
Mediterranean Fever

Background:Familial Mediterranean fever (FMF) is an auto-inflammatory disease commonly affects people from Mediterranean basin. It is characterized by acute self-limiting inflammatory attacks of serous membranes. The disease is commonly associated with musculoskeletal symptoms of lower extremities such as arthritis, exercise induced leg pain, as well as protracted febrile myalgia. The term of anaerobic exercise capacity describes the ability of performing quick and explosive tasks such as stair climbing and brisk walking. It is well known that anaerobic exercise capacity is closely related to functional status.Objectives:To assess the relationship between anaerobic exercise capacity and lower extremity functionality in patients with FMF.Methods:Twenty-eight FMF patients (57% female) were included in the study. Median age was 33.5 (IQR 25/75: 23.3/44.3) years, median body mass index was 24.3 (IQR 25/75: 21.0/27.8) kg/m2, median time since symptom onset was 20.0 (IQR 25/75: 11.5/24.5) years, median time since diagnosis was 10.0 (IQR 25/75: 3.75/17.5) years, and median colchicine dosage was 1.5 (IQR 25/75: 1.0/1.5) mg/day. Anaerobic exercise capacity was measured with Wingate Anaerobic Test by using a cycle ergometer. Peak power (watt/kg) and average power (watt/kg) were calculated. Stair climbing, standing from a chair, and walking were assessed by using 9-step stair climb test, 10-repetition chair stand test, and 6-minute walking distance, respectively. Spearman’s rank-order correlation test was used to analyse the relationships between anaerobic exercise capacity and lower extremity functional tests.Results:The results of the anaerobic exercise capacity and lower extremity functional test scores of patients with FMF were summarized in table 1. Moderate relationships were found between both peak and average anaerobic exercise capacities and lower extremity functional status tests (Table 1, p<0.05). Six-minute walking distance has the strongest association with both peak (rho: .672, p<0.001) and average (rho: .689, p<0.001) anaerobic exercise capacity.Table 1.Anaerobic exercise capacity scores and lower extremity functionality as well as the relationships between anaerobic capacity and functional tests in patient with familial Mediterranean fever.CharacteristicsMedian (IQR 25/75)(n:28)The correlation results, rho, p valuesPeak Power(watt/kg)Average Power (watt/kg)9-step stair climb test (seconds)5.7 (5.1/6.4)-.590*-.648*p:0.001p: 0.00110-repetition chair stand test (seconds)16.6 (13.7/18.7)-.493*-.476*p:0.008p:0.0106-minute walking distance (meters)594.1 (551.1/643.3).672*.689*p<0.001p<0.001Peak power (watt/kg)5.8 (4.1/7.9)Average power (watt/kg)4.6 (3.1/5.9)IQR 25/75: Interquartile range between 25th and 75th percentiles; kg: kilograms, *Spearman’s rank-order correlation test, p<0.05.Conclusion:According to our results, anaerobic exercise capacity is related to lower extremity functional status in patients with FMF. Improving anaerobic capacity by using optimal rehabilitation programs including speed and agility exercises may help to improve anaerobic exercise capacity, and consequently lower extremity functionality in those patients.Disclosure of Interests:None declared

scholarly journals The effect of citrus flavonoid extract supplementation on anaerobic capacity in moderately trained athletes: a randomized controlled trial

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Lieke E. van Iersel ◽  
Yala R. Stevens ◽  
Jose M. Conchillo ◽  
Freddy J. Troost
Keyword(s):  
Exercise Capacity ◽  
Exercise Performance ◽  
Power Output ◽  
High Intensity ◽  
Peak Power ◽  
Average Power ◽  
Anaerobic Capacity ◽  
High Intensity Exercise ◽  
Anaerobic Exercise ◽  
Average Power Output

Abstract Background Nutritional supplementation is commonly used by athletes to improve their exercise performance. Previous studies demonstrated that citrus flavonoid extract (CFE) supplementation may be an effective strategy to improve exercise performance in male athletes. Yet, no conclusive research has been performed to investigate the effect of chronic CFE supplementation on high-intensity exercise performance under anaerobic conditions. Therefore, the aim of the study was to assess whether CFE supplementation in daily dosages of 400 and 500 mg for a period of 4 and 8 weeks improves anaerobic exercise capacity. Methods A randomized, double-blind, placebo controlled, parallel clinical study was conducted in 92 moderately trained healthy men and women. Subjects were randomized to receive 400 mg of CFE (n = 30), 500 mg of CFE (n = 31) or placebo (n = 31) daily, for 8 consecutive weeks. The Wingate anaerobic test was used to assess anaerobic exercise capacity and power output at baseline, after 4 weeks and after 8 weeks. Results After 4 weeks supplementation, average power output significantly increased in the 400 mg group (Estimated difference [ED] = 38.2 W [18.0, 58.3]; p < 0.001; effect size [ES] = 0.27) and in the 500 mg group (ED = 21.2 W [0.91, 41.4]; p = 0.041; ES = 0.15) compared to placebo. The 5 s peak power output was also increased in the 400 mg group (ED = 53.6 [9.96, 97.2]; p = 0.017; ES = 0.25) after 4 weeks compared to placebo. After 8 weeks of supplementation, average power output was significantly improved in the group receiving 400 mg of CFE (ED = 31.6 [8.33, 54.8]; p = 0.008; ES = 0.22) compared to placebo. Conclusion These results demonstrate that CFE supplementation improved anaerobic capacity and peak power during high intensity exercise in moderately trained individuals. Further research is needed to identify the underlying mechanisms that are affected by CFE supplementation. Trial registration ClinicalTrials.gov (NCT03044444). Registered 7 February 2017

scholarly journals An Eye-Safe, SBS-Free Coherent Fiber Laser LIDAR Transmitter with Millijoule Energy and High Average Power

Photonics ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 15
Author(s):  
Mehmetcan Akbulut ◽  
Leonid Kotov ◽  
Kort Wiersma ◽  
Jie Zong ◽  
Maohe Li ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Repetition Rate ◽  
Peak Power ◽  
Figure Of Merit ◽  
Current System ◽  
Glass Fibers ◽  
Average Power ◽  
High Gain ◽  
Short Length ◽  
High Average Power

We report on an eye-safe, transform-limited, millijoule energy, and high average power fiber laser. The high gain and short length of the NP phosphate-glass fibers enable the SBS-free operation with kW level peak power. The output energy is up to 1.3 mJ, and the average power is up to 23 W at an 18 kHz repetition rate with 600 ns pulses (peak power > 2.1 kW). The PER is ≈16 dB and the M2 of the beam is 1.33 × 1.18. The coherent LIDAR Figure Of Merit (FOM) is 174 mJ*sqrt(Hz), which to our knowledge is the highest reported for a fiber laser. We also report 0.75 mJ energy and >3.7 kW peak power with down to 200 ns pulses and up to 1.21 mJ energy with a 3–5 kHz repetition rate operation of the current system.

A Comparison of Asynchronous and Synchronous Arm Cranking During the Wingate Test

2011 ◽  
Vol 6 (3) ◽  
pp. 419-426 ◽  
Author(s):  
Dale I. Lovell ◽  
Dale Mason ◽  
Elias Delphinus ◽  
Chris McLellan
Keyword(s):  
Blood Lactate ◽  
Peak Power ◽  
Anaerobic Power ◽  
Lactate Concentration ◽  
Blood Lactate Concentration ◽  
Wingate Test ◽  
Mean Power ◽  
Arm Cranking ◽  
Minimum Power ◽  
Time To Peak

Purpose:The aim of this study was to compare asynchronous (AS Y) arm cranking (cranks at 180° relative to each other) with synchronous (SYN) arm cranking (parallel crank setting) during the 30 s Wingate anaerobic test.Methods:Thirty-two physically active men (aged 22.1 ± 2.4 y) completed two Wingate tests (one ASY and one SYN) separated by 4 d in a randomized counterbalanced order. The Wingate tests were completed on a modified electromagnetically braked cycle ergometer. Performance measures assessed during the two tests include peak power, mean power, minimum power, time to peak power, rate to fatigue and maximum cadence (RPMmax). Blood lactate concentration was also measured before and 5 min after the tests.Results:Peak and mean power (both absolute and relative to body weight) during SYN arm cranking were significantly (p < 0.001) less than during ASY arm cranking. Rate to fatigue and RPMmax were also significantly (p = 0.012) lower during SYN arm cranking compared with ASY arm cranking. No significant difference was found between test conditions for minimum power, time to peak power or blood lactate concentration.Conclusions:These findings demonstrate that ASY arm cranking results in higher peak and mean anaerobic power compared with SYN arm cranking during the Wingate test. Therefore, an ASY arm crank configuration should be used to assess anaerobic power in most individuals although specific population groups may require further testing to determine which crank configuration is most suitable for the Wingate test.

Dystrophinopathies and Limb-Girdle Muscular Dystrophies

2017 ◽  
Vol 48 (04) ◽  
pp. 262-272 ◽  
Author(s):  
Anna Sarkozy ◽  
Mariacristina Scoto ◽  
Francesco Muntoni ◽  
Joana Domingos
Keyword(s):  
Clinical Trials ◽  
Treatment Options ◽  
Shoulder Girdle ◽  
Muscle Disease ◽  
Standards Of Care ◽  
Muscular Dystrophies ◽  
New Treatment ◽  
Shoulder Girdle Muscles ◽  
Independent Ambulation ◽  
Duchenne's Muscular Dystrophy

AbstractMuscular dystrophies are a heterogeneous group of inherited diseases. The natural history of these disorders along with their management have changed mainly due to a better understanding of their pathophysiology, the evolution of standards of care, and new treatment options. Dystrophinopathies include both Duchenne's and Becker's muscular dystrophies, but in reality they are a spectrum of muscle diseases caused by mutations in the gene that encodes the protein dystrophin. Duchenne's muscular dystrophy is the most common form of inherited muscle disease of childhood. The current standards of care considerably prolong independent ambulation and survival. Several therapeutic options either aiming at substituting/correcting the primary protein defect or limiting the progression of the dystrophic process are currently being explored in clinical trials.Limb-girdle muscular dystrophies (LGMDs) are rare and heterogeneous conditions, characterized by weakness and wasting of the pelvic and shoulder girdle muscles. Originally classified into dominant and recessive, > 30 genetic forms of LGMDs are currently recognized. Further understanding of the pathogenic mechanisms of LGMD will help identifying novel therapeutic approaches that can be tested in clinical trials.

scholarly journals Electromyographic Evaluation of the Shoulder Muscle after a Fatiguing Isokinetic Protocol in Recreational Overhead Athletes

2021 ◽  
Vol 18 (5) ◽  
pp. 2516
Author(s):  
Sebastian Klich ◽  
Adam Kawczyński ◽  
Bogdan Pietraszewski ◽  
Matteo Zago ◽  
Aiguo Chen ◽  
...  
Keyword(s):  
External Rotation ◽  
Shoulder Girdle ◽  
Median Frequency ◽  
Shoulder Injury ◽  
Overhead Athletes ◽  
Upper Trapezius ◽  
Main Effect ◽  
Shoulder Girdle Muscles ◽  
Exercise Induced ◽  
The Right

The goal of our study was to examine the muscle activity of the shoulder girdle after isokinetic fatigue, which may simulate muscle activities commonly occurring during specific sport-related activities in recreational overhead asymptomatic athletes. We hypothesized that exercise-induced fatigue, reported after isokinetic protocols, may cause a decrease in the median frequency (MF) of the upper trapezius (UT), infraspinatus (IS), and deltoid muscles. Twenty-four male overhead volleyball (n = 8), handball (n = 8), and tennis (n = 8) athletes participated in this study. All subjects were without shoulder injury history. The surface electromyography (SEMG) was collected on the right (dominant) side of the shoulder girdle muscles in the following order: UT, IS and anterior (DA), and posterior deltoideus (DP). The fatigue protocol consisted of three sets of 32 maximum isokinetic concentric contractions while performing shoulder internal and external rotation at an isokinetic speed of 120 o/s. The resultant difference in median frequency (ΔMF) values consistently dropped after the fatiguing tasks across all recorded muscles, in terms of the initial MF (MFINI = 65.1 ± 1.1 Hz) and final MF (MFFIN = 57.9 ± 0.9 Hz), and the main effect of time was significant (F(1,22) = 43.15, p < 0.001). MF values decreased mostly for IS (ΔMFIS = −9.9 ± 1.6 Hz) and DP (ΔMFPD = −9.5 ± 1.9 Hz) muscles, while DA and UT showed smaller changes (ΔMFDA = −6.9 ± 1.5 Hz) and (ΔMFUT = −3.2 ± 1.3 Hz). The results of our study show a meaningful contribution in determining increased fatigue of the shoulder girdle muscles during repeated isokinetic internal-external rotation protocols. We have also demonstrated a significant decrease in MF in all examined muscles, especially IS and DA.

5 Examination of the relationship between changes in workload and changes in loaded countermovement jump during a rugby union season

2021 ◽  
Vol 55 (16) ◽  
pp. 941.3-942
Author(s):  
Rob Strong ◽  
Daniel West ◽  
Joe Kupsarevic
Keyword(s):  
Peak Power ◽  
Rank Order ◽  
Rugby Union ◽  
Countermovement Jump ◽  
Match Play ◽  
Time To Peak ◽  
Significant Relationships ◽  
Flight Season ◽  
Acute Changes ◽  
The Relationship

BackgroundThe loaded countermovement jump (CMJ) is a variation on the normal CMJ (bodyweight-only), used routinely in sport settings as a measure of neuromuscular fatigue (NMF). Although commonplace, the CMJ variables that are most sensitive to NMF remain somewhat unclear.PurposeThe aim of this study was to examine the relationship between changes in workload and changes in the loaded CMJ; specifically, to determine its suitability for assessment of NMF.MethodsEighteen professional rugby union players performed loaded CMJ tests on seven occasions over the course of thirteen weeks, during an English top-flight season. Eight CMJ variables were measured, assessing different aspects of the CMJ. Workload was measured by GPS total distance and was the sum of the previous week’s data, recorded in on-field training and match-play. Spearman’s rank-order correlations were calculated to identify the relationship between changes in workload and changes in loaded CMJ variables.ResultsNo significant relationships were found between loaded CMJ variables and workload with no lag or workload lagged one week. Significant relationships were found between workload lagged 2 weeks and flight time/contact time (FT-CT; rs=-0.35; p=0.04) and time to peak power (TtPP; rs=0.35; p=0.05).ConclusionThis study suggests loaded CMJ is not a suitable test to monitor acute changes to NMF. However, results also indicate that FT-CT and TtPP, are associated with changes in workload lagged 2-weeks. Therefore, certain CMJ variables may prove useful to help prescribe alterations to athlete training plans following periods of heavy workload.

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