TY - JOUR
T1 - Divergent isokinetic muscle strength deficits in street running athletes
AU - Grazioli, Rafael
AU - Sobieski, Nataniel
AU - Wilhelm, Eurico N.
AU - Brusco, Clarissa Muller
AU - Rech, Anderson
N1 - Funding information: We thank to CAPES and CNPq Brazilian Government Associations for support. We also thank to Universidade de Caxias do Sul and all the running athletes who participated in this research and made it possible.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - Background: Running is a very popular activity and muscle strength imbalance has been treated with caution to prevent injuries. Aim: The present study aimed to compare and correlate knee flexion and extension strength imbalance based on peak torque (PT) and total work (TW) in running athletes. Methods: Thirty-eight male amateur running athletes (38 ± 6 years; 80.6 ± 8.3 kg; 177 ± 7 cm; 7.8 ± 8.4 years of training; 3.5 ± 0.9 training sessions a week; 33.5 ± 13.4 km of training per week) took part in the present study. Knee flexion eccentric and concentric PT and TW, as well as concentric knee extension PT and TW were assessed. PT- and TW-based hamstring-to-quadriceps ratios (H:Q), as well as PT and TW contralateral imbalance were quantified. Results: A significant correlation was observed between TW and PT concentric knee flexion contralateral deficits (r = 0.52, p < 0.001). No further correlations were found among TW- and PT-based muscle strength imbalance variables (p > 0.05). All mean comparisons of H:Q and contralateral imbalances using TW or PT were significantly different (p < 0.05). Conclusions: Our results showed that TW and PT muscle strength imbalance were unrelated, and the H:Q and contralateral imbalance profile of endurance runners may differ based on the isokinetic variable analyzed.
AB - Background: Running is a very popular activity and muscle strength imbalance has been treated with caution to prevent injuries. Aim: The present study aimed to compare and correlate knee flexion and extension strength imbalance based on peak torque (PT) and total work (TW) in running athletes. Methods: Thirty-eight male amateur running athletes (38 ± 6 years; 80.6 ± 8.3 kg; 177 ± 7 cm; 7.8 ± 8.4 years of training; 3.5 ± 0.9 training sessions a week; 33.5 ± 13.4 km of training per week) took part in the present study. Knee flexion eccentric and concentric PT and TW, as well as concentric knee extension PT and TW were assessed. PT- and TW-based hamstring-to-quadriceps ratios (H:Q), as well as PT and TW contralateral imbalance were quantified. Results: A significant correlation was observed between TW and PT concentric knee flexion contralateral deficits (r = 0.52, p < 0.001). No further correlations were found among TW- and PT-based muscle strength imbalance variables (p > 0.05). All mean comparisons of H:Q and contralateral imbalances using TW or PT were significantly different (p < 0.05). Conclusions: Our results showed that TW and PT muscle strength imbalance were unrelated, and the H:Q and contralateral imbalance profile of endurance runners may differ based on the isokinetic variable analyzed.
KW - Hamstring-to-quadriceps ratios
KW - Isokinetic dynamometry
KW - Muscle imbalance
KW - Running
UR - http://www.scopus.com/inward/record.url?scp=85117511245&partnerID=8YFLogxK
U2 - 10.1007/s11332-021-00856-2
DO - 10.1007/s11332-021-00856-2
M3 - Article
AN - SCOPUS:85117511245
SN - 1824-7490
VL - 18
SP - 781
EP - 788
JO - Sport Sciences for Health
JF - Sport Sciences for Health
IS - 3
ER -