TY - JOUR
T1 - Hamstring rate of torque development is more affected than maximal voluntary contraction after a professional soccer match
AU - Grazioli, Rafael
AU - Lopez, Pedro
AU - Andersen, Lars L
AU - Machado, Carlos Leonardo Figueiredo
AU - Pinto, Matheus Daros
AU - Cadore, Eduardo Lusa
AU - Pinto, Ronei Silveira
PY - 2019/11
Y1 - 2019/11
N2 - Match-induced fatigue of knee muscle strength and agonist-antagonist strength-ratios may affect both performance and risk of injury in soccer players. Once explosive tasks are imperative in soccer as well as hamstring strain injuries occur during high-velocity moments, rapid force capacity of this muscle group is especially important. This study evaluated the effect of match-induced fatigue on knee muscle strength and strength-ratio parameters after a single professional soccer match. Male professional soccer players (n = 16; 24.2 ± 3.9 years) were tested before and after a soccer match (56.2 ± 22.6 min of playing) for knee flexors (hamstring) and extensors (quadriceps) isometric peak torque (MVC) and rate of torque development (RTD)–as well as the hamstring-to-quadriceps ratio (H:Q)–at 30° of knee flexion. Knee injuries often occur at this joint angle, which is common in sprinting, pivoting, sidecutting, and jumping. Match-induced fatigue caused a left shift in the knee extensors torque-time curve with no significant change in both early (i.e. 0–50 ms) and late (i.e. 0–200 ms) RTD, and a right shift in the knee flexors torque-time curve with a decrease in early RTD (∼16%, p =.029) and late RTD (∼11%, p =.011). Knee extensors and knee flexors peak torque remained unchanged (p >.05). Early RTD H:Q decreased by∼24% (p =.027), while late RTD H:Q and MVC H:Q remained unchanged (p >.05). In conclusion, match-induced fatigue impaired the ability to rapidly produce force at an angle where injuries are most susceptible to occur. Important information is missed if only the traditional H:Q is considered. .
AB - Match-induced fatigue of knee muscle strength and agonist-antagonist strength-ratios may affect both performance and risk of injury in soccer players. Once explosive tasks are imperative in soccer as well as hamstring strain injuries occur during high-velocity moments, rapid force capacity of this muscle group is especially important. This study evaluated the effect of match-induced fatigue on knee muscle strength and strength-ratio parameters after a single professional soccer match. Male professional soccer players (n = 16; 24.2 ± 3.9 years) were tested before and after a soccer match (56.2 ± 22.6 min of playing) for knee flexors (hamstring) and extensors (quadriceps) isometric peak torque (MVC) and rate of torque development (RTD)–as well as the hamstring-to-quadriceps ratio (H:Q)–at 30° of knee flexion. Knee injuries often occur at this joint angle, which is common in sprinting, pivoting, sidecutting, and jumping. Match-induced fatigue caused a left shift in the knee extensors torque-time curve with no significant change in both early (i.e. 0–50 ms) and late (i.e. 0–200 ms) RTD, and a right shift in the knee flexors torque-time curve with a decrease in early RTD (∼16%, p =.029) and late RTD (∼11%, p =.011). Knee extensors and knee flexors peak torque remained unchanged (p >.05). Early RTD H:Q decreased by∼24% (p =.027), while late RTD H:Q and MVC H:Q remained unchanged (p >.05). In conclusion, match-induced fatigue impaired the ability to rapidly produce force at an angle where injuries are most susceptible to occur. Important information is missed if only the traditional H:Q is considered. .
KW - Peak torque
KW - fatigue
KW - hamstring-to-quadriceps ratios
KW - rate of torque development
KW - strength
UR - http://www.scopus.com/inward/record.url?scp=85066610409&partnerID=8YFLogxK
U2 - 10.1080/17461391.2019.1620863
DO - 10.1080/17461391.2019.1620863
M3 - Journal article
C2 - 31099729
SN - 1746-1391
VL - 19
SP - 1336
EP - 1341
JO - European Journal of Sport Science
JF - European Journal of Sport Science
IS - 10
ER -