scholarly journals Knee Kinematics In Division Iii Soccer Players Before And After A Fatigue Protocol

2021 ◽  
Vol 53 (8S) ◽  
pp. 144-144
Author(s):  
Natalee Lessert ◽  
Ana Ribeiro
Keyword(s):  
Knee Kinematics ◽  
Soccer Players ◽  
Division Iii ◽  
Fatigue Protocol ◽  
Before And After

scholarly journals The Effect of Fatigue on Kicking Velocity in Soccer Players

2012 ◽  
Vol 35 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Ricardo Ferraz ◽  
Roland Van Den Tillaar ◽  
Mário C. Marques
Keyword(s):  
Repeated Measures ◽  
Body Height ◽  
Negative Influence ◽  
Soccer Players ◽  
Exercise Protocol ◽  
Performance Skills ◽  
Fatigue Protocol ◽  
Repeated Exercise ◽  
Before And After ◽  
Ball Velocity

Soccer is a game in which fatigue can negatively influence players’ performance. Few studies have examined the practical effects of fatigue on soccer performance skills. Thus, the aim of the present study was to evaluate the effect of fatigue, acutely induced by means of a soccer specific circuit on ball velocity. Ten amateur soccer players (age 27.3 ± 5.25 yr; experience 16,8 ± 6.05 yr; level secondary division; body height 1,80 m ± 0,06; body mass 75,7 kg ± 5,78), participated in this study and performed maximal instep kicks before and after the implementation of an intensive, intermittent and repeated exercise protocol. Analysis of variance with repeated measures indicated a significant decrease (p<0.05) in ball velocity after just one round of the fatigue circuit. However, after the third circuit ball velocity increased and after the fifth circuit maximal ball velocity increased yet again (compared to the second circuit) and was not significantly different from before commencement of the fatigue protocol. The results partly confirmed the hypothesis of the negative influence of fatigue upon ball velocity in soccer kicking, demonstrating also some variability in the presented values of ball velocity perhaps theoretically accounted for by the general governor model.

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.

scholarly journals Effects of Short-Term Plyometric Training on Agility, Jump and Repeated Sprint Performance in Female Soccer Players

2021 ◽  
Vol 18 (5) ◽  
pp. 2274
Author(s):  
Marcin Maciejczyk ◽  
Renata Błyszczuk ◽  
Aleksander Drwal ◽  
Beata Nowak ◽  
Marek Strzała
Keyword(s):  
Physical Performance ◽  
Sprint Performance ◽  
Soccer Players ◽  
Plyometric Training ◽  
Countermovement Jump ◽  
Short Term ◽  
Jump Performance ◽  
Squat Jump ◽  
Repeated Sprint ◽  
Before And After

The aim of the study was to determine the effects of short-term (4 weeks, twice a week: 8 sessions) plyometric training on agility, jump, and repeated sprint performance in female soccer players. The study comprised 17 females performing this sports discipline. The players were randomly divided into two groups: with plyometric training (PLY) and the control (CON). All players followed the same training program, but the PLY group also performed plyometric exercises. Tests used to evaluate physical performance were carried out immediately before and after PLY. After implementing the short PLY training, significant improvement in jump performance (squat jump: p = 0.04, ES = 0.48, countermovement jump: p = 0.009, ES = 0.42) and agility (p = 0.003, ES = 0.7) was noted in the PLY group. In the CON group, no significant (p > 0.05) changes in physical performance were observed. In contrast, PLY did not improve repeated sprint performance (p > 0.05) among female soccer players. In our research, it was shown that PLY can also be effective when performed for only 4 weeks instead of the 6–12 weeks typically applied.

scholarly journals The Effects of Repeated Sprints on the Kinematics of 3-Point Shooting in Basketball

2018 ◽  
Vol 62 (1) ◽  
pp. 5-14 ◽  
Author(s):  
Jean Slawinski ◽  
Julien Louis ◽  
Julien Poli ◽  
Eve Tiollier ◽  
Charles Khazoom ◽  
...  
Keyword(s):  
Wrist Joint ◽  
Height Velocity ◽  
Centre Of Mass ◽  
Joint Angles ◽  
Basketball Players ◽  
Repeated Sprints ◽  
Fatigue Protocol ◽  
Before And After ◽  
Measurement Units ◽  
Maximal Exercise Capacity

AbstractFatigue modifies the kinematics of various sports-related movements. Basketball induces fatigue, however, the effects of fatigue on the kinematics of shooting have never been studied. This study analysed the effects of fatigue induced by repeated sprints on the kinematics of 3-point shooting (3PS) in young, elite basketball players (U18 level). 3D joint angles were calculated at the maximum and minimum heights of the centre of mass during 3PS, using inertial measurement units (Biomech system, Xsens Technologies BV, Enschede, The Netherlands). Height, velocity and the angle of the ball at the time of release were extrapolated from the wrist joint angles. All players performed four 3PS actions in dynamic conditions before and after a fatigue protocol at 70% of their maximal exercise capacity. The fatigue protocol consisted of a shuttle test with repeated 20-m sprints interspersed with sets of 5 jumps. There was no change in the kinematics of 3PS (p > 0.05), or the ball release variables (p > 0.05) following the fatigue protocol. This suggests that elite basketball players are able to cope with physical fatigue while performing coordinated movements such as 3PS.

In Vivo Comparison of Knee Kinematics Before and After High-Flexion Posterior Cruciate-Retaining Total Knee Arthroplasty

2010 ◽  
Vol 25 (6) ◽  
pp. 964-969 ◽  
Author(s):  
Atsushi Kitagawa ◽  
Nobuhiro Tsumura ◽  
Takaaki Chin ◽  
Kazuyoshi Gamada ◽  
Scott A. Banks ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Knee Kinematics ◽  
Cruciate Retaining ◽  
High Flexion ◽  
Before And After ◽  
Total Knee

Gender differences in the neuromuscular fitness profiles of NCAA Division III soccer players

2012 ◽  
Vol 20 (2) ◽  
pp. 115-120
Author(s):  
Kevin Burfeind ◽  
Junggi Hong ◽  
Stasinos Stavrianeas
Keyword(s):  
Gender Differences ◽  
Ncaa Division Iii ◽  
Soccer Players ◽  
Division Iii

scholarly journals Associations Between Selected Training-Stress Measures and Fitness Changes in Male Soccer Players

2019 ◽  
Vol 14 (8) ◽  
pp. 1050-1057 ◽  
Author(s):  
Alireza Rabbani ◽  
Mehdi Kargarfard ◽  
Carlo Castagna ◽  
Filipe Manuel Clemente ◽  
Craig Twist
Keyword(s):  
Heart Rate ◽  
High Intensity ◽  
Soccer Players ◽  
Running Performance ◽  
Total Distance ◽  
Professional Soccer ◽  
Before And After ◽  
Body Load ◽  
Training Stress ◽  
Training Impulse

Purpose: To investigate the relationship between accumulated global positioning system–accelerometer-based and heart rate–based training metrics and changes in high-intensity intermittent-running capacity during an in-season phase in professional soccer players. Methods: Eleven male professional players (mean [SD] age 27.2 [4.5] y) performed the 30-15 Intermittent Fitness Test (30-15IFT) before and after a 5-wk in-season training phase, and the final velocity (VIFT) was considered their high-intensity intermittent-running capacity. During all sessions, Edwards training impulse (Edwards TRIMP), Banister TRIMP, Z5 TRIMP, training duration, total distance covered, new body load (NBL), high-intensity running performance (distance covered above 14.4 km·h−1), and very-high-intensity running performance (distance covered above 19.8 km·h−1) were recorded. Results: The players’ VIFT showed a most likely moderate improvement (+4.3%, 90% confidence limits 3.1–5.5%, effect size 0.70, [0.51–0.89]). Accumulated NBL, Banister TRIMP, and Edwards TRIMP showed large associations (r = .51–.54) with changes in VIFT. A very large relationship was also observed between accumulated Z5 TRIMP (r = .72) with changes in VIFT. Large to nearly perfect within-individual relationships were observed between NBL and some of the other training metrics (ie, Edwards TRIMP, Banister TRIMP, training duration, and total distance) in 10 out of 11 players. Conclusions: Heart rate–based training metrics can be used to monitor high-intensity intermittent-running-capacity changes in professional soccer players. The dose–response relationship is also largely detected using accelerometer-based metrics (ie, NBL) to track changes in high-intensity intermittent-running capacity of professional soccer players.

scholarly journals Effects of Two Competitive Soccer Matches on Landing Biomechanics in Female Division I Soccer Players

Sports ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 237
Author(s):  
Benjamin J. Snyder ◽  
Randolph E. Hutchison ◽  
Christopher J. Mills ◽  
Stephen J. Parsons
Keyword(s):  
Shear Force ◽  
Reaction Force ◽  
Knee Extension ◽  
Soccer Players ◽  
Control Group ◽  
Initial Contact ◽  
Time Points ◽  
Landing Biomechanics ◽  
Isometric Knee Extension ◽  
Before And After

Fatigue has been proposed to increase the risk of knee injury. This study tracked countermovement jump, knee isometric strength, and kinetics and kinematics in 8 female soccer players (experimental group) during an anticipated sidestep maneuver before and after two matches played over a 43-h period. Time points were: Before and after match 1 (T0 and T1), 12 h after the first match (T2), and immediately after the second match (T3). A control group participated only in practice sessions. Isometric knee extension strength decreased by 14.8% at T2 (p = 0.003), but knee flexion was not affected until T3, declining by 12.6% (p = 0.018). During the sidestep maneuver, knee joint degrees of flexion at initial contact was increased by 17.1% at T3, but maximum knee and hip angle at initial contact were unchanged. Peak resultant ground reaction force (GRF) increased by 12.6% (p = 0.047) at T3 (3.03 xBW) from 2.69 xBW at T0, while posterior GRF was significantly higher than T0 at all three subsequent time points (T1 = 0.82 ± 0.23 xBW, T2 = 0.87 ± 0.22 xBW, T3 = 0.89 ± 0.22 xBW). Anterior tibial shear force increased significantly (p = 0.020) at T3 (1.24 ± 0.12 xBW) compared to T1 (1.15 ± 0.13 xBW), an 8.8% increase. Lateral tibial shear force was significantly higher at both T1 (0.95 ± 0.20 xBW) and T3 (1.15 ± 0.38 xBW) compared to T0 (0.67 ± 0.25 xBW). These findings suggest that participation in a soccer match has significant effects on both physical performance parameters and kinetics/kinematics during a sidestep cut, but these can be more pronounced after a second match with short rest.

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