FSI Football Science Update

Relative skeletal maturity status affects injury burden in U14 elite academy football players.

Monasterio X, Bidaurrazaga-Letona I, Larruskain J, Lekue JA, Diaz-Beitia G, Santisteban J, Martin-Garetxana I, Gil SM.

Scand J Med Sci Sports. 2022 Jun 24. doi: 10.1111/sms.14204.

This study in 183 U14 elite academy football players in 9 years found that early maturers had an injury burden 2.8-times higher than late maturers, with muscle injuries 4-times more burdensome and joint/ligament injuries 12- times more burdensome, what should be taken into account for targeted injury prevention programs.



The Relationship between the Hamstring-to-Quadriceps Ratio and Jumping and Sprinting Abilities of Young Male Soccer Players.

Diker G, Struzik A, Ön S, Zileli R.

Int J Environ Res Public Health. 2022 Jun 18;19(12):7471. doi: 10.3390/ijerph19127471.

This study in 26 young elite soccer players found a significant relationship was obtained between the isokinetic H/Q ratio (60°/s) and 30 m sprint time (r = 0.47) what may indicate an important role of knee joint extensors in sprinting performance. The H/Q ratio was not significantly associated with the CMJ, SJ or 10 m sprint performance.



The effect of mid-season coach turnover on running match performance and match outcome in professional soccer players.

Radzimiński Ł, Padrón-Cabo A, Modric T, Andrzejewski M, Versic S, Chmura P, Sekulic D, Konefał M.

Sci Rep. 2022 Jun 23;12(1):10680. doi: 10.1038/s41598-022-14996-z.

This study on 23 mid-season coach turnovers in the Polish Ekstraklasa (highest level of competition in Poland) during seasons 2019 to 2021 found that new coaches collected a significantly higher number of points than dismissed coaches, with increased physical performance in total and high-intensity running distance. However, this effect disappears after a period of approximately 5 games.



Impact of Cold-Water Immersion Compared with Passive Recovery Following a Single Bout of Strenuous Exercise on Athletic Performance in Physically Active Participants: A Systematic Review with Meta-analysis and Meta-regression.

Moore E, Fuller JT, Buckley JD, Saunders S, Halson SL, Broatch JR, Bellenger CR.

Sports Med. 2022 Jul;52(7):1667-1688. doi: 10.1007/s40279-022-01644-9. Epub 2022 Feb 14.

This systematic review of 52 studies found that cold-water immersion (CWI) improved the recovery of muscular power 24 h after eccentric and high-intensity exercise, and reduced serum CK 24 h after high-intensity exercise. CWI also improved muscle soreness and perceived feelings of recovery 24 h after high-intensity exercise. Shorter time and lower temperatures were related to the largest beneficial effects on serum CK and endurance performance after high-intensity exercise.



Drop jump neuromuscular performance qualities associated with maximal horizontal deceleration ability in team sport athletes.

Harper DJ, Cohen DD, Rhodes D, Carling C, Kiely J.

Eur J Sport Sci. 2022 Jul;22(7):1005-1016. doi: 10.1080/17461391.2021.1930195. 

This study on 29 university athletes performing Drop Jumps on force plates and maximal horizontal decelerations following a 20 m acceleration measured with radar found that the athletes with greater drop jump reactive strength index RSI demonstrated superior horizontal deceleration ability. Drop jump RSI had a greater association with the early compared to the late horizontal deceleration sub-phase. Of the drop jump kinetic variables examined, concentric mean force had the largest associations with horizontal deceleration ability.