TOP 3 SPORT SCIENCE ARTICLES WEEK 22, 2019

Posted by Bernardo Requena on Jun 21, 2019 10:00:00 AM
Bernardo Requena
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Players' Physical Performance Decreased After Two-Thirds of the Season: Results of 3 Consecutive Seasons in the German First Bundesliga.

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Chmura P, Konefal M, Wong DP, Figueiredo AJ, Kowalczuk E, Rokita A, Chmura J, Andrejewski M. Int J Environ Res Public Heath 2019, 16(11)

The objective of this study was to verify if the players of a competitive European league can maintain the physical and technical performance in the matches throughout the season. For this, 70 players from the Bundesliga (Germany) were selected and their running and technical performance was analyzed: Total distance, distances: <11 km·h-1, 11-13.99 km·h-1, 14-16.99 km·h-1, 17-20.99 km·h-1, 21-23.99 km·h-1, and> 24 km·h-1. The analysis was carried out during 3 consecutive seasons, dividing them into phases (1st phase: matches 1-6, 2nd: matches 7-11, 3rd: matches 12-17, 4th: matches 18-23, 5th: matches 24-28 and 6th : 29-34). The data shows an increase in running performance from the 1st to the 4th, except a significant decrease of the D <11 km·h-1 from the 1st to the 6th phase. His technical performance did not vary throughout the season.

TAKE HOME MESSAGES

Throughout a season, in a competitive league, divided into phases of 5-6 matches:
  • The distance <11 km·h-1 decreases gradually from the 1st phase.
  • However, match performance increased in all speed ranges (above 11 km·h-1) from the 1st to the 4th phase (matches 18-23), started to fall significantly in the 5th phase (values similar to the 1st), and suffering a significant decrease more important in the 6th phase (matches 29-34).
  • The performance peak is placed in the 4th stages (matches 18-23).
  • The players could keep the D> 24 km·h-1 relatively constant.

Influence of the structural components of artificial turf systems on impact attenuation in amateur football players

 

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Javier Sánchez-Sánchez, Ana M. Gallardo-Guerrero, Antonio García-Gallart, Juan Antonio Sánchez-Sáez, José L. Felipe & Alberto Encarnación-Martínez . Influence of the structural components of artificial turf systems on impact attenuation in amateur football players. Scientific Reports 9, Article number: 7774 (2019)

Impact caused by three third-generation artificial turfs with different structural components was evaluated in vivo by taping two triaxial accelerometers to the forehead and the distal end of the right tibia on 12 amateur football players who performed linear running tests at 12 , 14.4 km/h and at maximum speed in 20 m.

TAKE HOME MESSAGES

  • Better shock absorption was associated with a higher height of the fibre and greater quantity of infill, present in the ATS3 turf (see Fig).
  • On the other hand, these characteristics were accompanied by less energy restitution and longer stride time.

FSI STATEMENT

New generation artificial turfs should keep a balance between energy absorption - related with better injury prevention - and energy restitution - related with better running speed and less fatigue - to protect from injuries while allowing for good performance.

 

How anterior pelvic tilt affects the lower extremity kinematics during the late swing phase in soccer players while running: A time series analysis

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Shahab Alizadeh, Klaus Mattes. How anterior pelvic tilt affects the lower extremity kinematics during the late swing phase in soccer players while running: A time series analysis. Human Movement Science, Volume 66, 2019, Pages 459-466, ISSN 0167-9457.

Anterior pelvic tilt has been proposed to predispose to hamstrings injury in soccer players at the late swing phase during a sprint. This tilt was measured in 34 male amateur soccer players by using the DIERS Formetric 4D video rasterized stereography. Lower extremity angles at the late swing phase were recorded using an 8-camera Vicon motion capture system at 200 Hz while the athlete performed a high speed run on a motorized treadmill.

TAKE HOME MESSAGES

  • The average stationary anterior pelvic tilt angle was 18.7 ± 4. During the fast running test, the pelvis oscillated at the late swing phase but remained anteriorly tilted, the hip started in flexion but extended progressively when approaching ground contact, and the knee showed its peak flexion angle at the beginning of the phase and developed an extending motion until ground contact.
  • The anterior pelvic tilt angle of the male soccer players was negatively correlated with the amount of hip flexion (B in Figure ) and knee flexion (C in Figure) angles during the late swing phase while fast running.

FSI STATEMENTS

  • Increased anterior pelvic tilt leads to less hip and knee flexion motion during the late swing phase while running at high speed.
  • Due to hamstrings anatomy, this restriction is probably related to increased muscle tension, so increasing its injury risk.

Topics: Sport Science Articles