Changes in isokinetic muscle strength of the knee in elite female adolescent volleyball players after 4 years of systematic training
BACKGROUND:
There are few reports regarding changes in joint muscle strength in elite-level adolescent athletes after systematic training.
METHODS:
This study followed elite-level adolescent female volleyball players for 4 years to analyze changes in knee joint muscle strength after systematic training. We performed isokinetic muscle strength testing of the knee at angular velocities of 60°/s and 240°/s in 16 elite-level adolescent female volleyball players.
RESULTS:
Compared with baseline, in adulthood (4 years later), peak torque (240°/s) in the right flexor and extensor increased by 13.94% and 16.02% (P<0.05), but the increase was not statistically significant for the left knee (P>0.05). Left and right flexor endurance ratios increased by 17.00% and 14.75%, respectively (P<0.05). The difference between bilateral homonymous muscles was more than 15%, in adolescence, at 60°/s, N.=1 for flexors, N.=5 for extensors; at 240°/s, N.=2 for flexors, N.=4 for extensors and in adulthood, at 60°/s, N.=1 for flexors, N.=2 for extensors; at 240°/s N.=1 case for flexors, N.=3 for extensors.
CONCLUSIONS:
After 4 years of systematic training, elite-level adolescent female volleyball players had significant increased (240°/s) peak torque for the dominant knee, and the endurance ratio of bilateral flexor muscles was improved. We recommend strengthening the knee flexor muscle group during training to increase hamstrings-to-quadriceps ratio values and reduce the risk of knee injury.
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Aiheet: | naispuolinen lentopallo ammattilaisurheilu tutkimusmenetelmä nuoriso polvi nivel sääri, jalka lihas harjoittelu voima, vahvuus ennaltaehkäisy vamma pitkän tähtäimen suorituskyvyn kehittäminen reisilihakset |
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Aihealueet: | junioriurheilu biologiset ja lääketieteelliset tieteet |
Tagging: | isokinetisch |
DOI: | 10.23736/S0025-7826.21.03885-0 |
Julkaisussa: | Medicina dello Sport |
Julkaistu: |
2021
|
Vuosikerta: | 74 |
Numero: | 3 |
Sivuja: | 384-95 |
Julkaisutyypit: | artikkeli |
Kieli: | englanti (kieli) |
Taso: | kehittynyt |