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Quadricep and hamstring activation during drop jumps with changes in drop height.
Phys Ther Sport. 2011 Aug; 12(3):127-32.PT

Abstract

OBJECTIVE

Compare the muscle activation patterns of the quadricep-hamstring during drop jumps with increasing demands of drop heights.

DESIGN

Observational.

SETTING

University biomechanics laboratory.

PARTICIPANTS

Fifteen male and eight female college physical education students.

MAIN OUTCOME MEASURES

Electromyographic activity of the rectus femoris (RF) and biceps femoris (BF) during the landing and takeoff phase of drop jumps from 20 to 60-cm heights. The ground contact time, vertical ground reaction force (vGRF), knee flexion angle during ground contact, and jump height after takeoff were also analyzed.

RESULTS

The activation of RF was higher in the drop jump from 60-cm than that from 20- and 30-cm (comparing 107.0 ± 45.9 to 82.3 ± 30.8 and 88.9 ± 38.9 %MVIC, P<.05) during the landing phase. Activation of BF remained similar across all drop heights. Drop jump from 60-cm resulted in greater contact time during takeoff phase and peak vGRF, and resulted in greater maximum knee flexion but straighter knee at ground contact than from lower drop heights.

CONCLUSION

At drop height of 60-cm, the altered knee muscular activation and movement patterns may diminish the effectiveness of plyometric training and increase the potential injury risk of knee.

Authors+Show Affiliations

Department of Physical Education, Chinese Culture University, Taipei, Taiwan.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21802039

Citation

Peng, Hsien-Te, et al. "Quadricep and Hamstring Activation During Drop Jumps With Changes in Drop Height." Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine, vol. 12, no. 3, 2011, pp. 127-32.
Peng HT, Kernozek TW, Song CY. Quadricep and hamstring activation during drop jumps with changes in drop height. Phys Ther Sport. 2011;12(3):127-32.
Peng, H. T., Kernozek, T. W., & Song, C. Y. (2011). Quadricep and hamstring activation during drop jumps with changes in drop height. Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine, 12(3), 127-32. https://doi.org/10.1016/j.ptsp.2010.10.001
Peng HT, Kernozek TW, Song CY. Quadricep and Hamstring Activation During Drop Jumps With Changes in Drop Height. Phys Ther Sport. 2011;12(3):127-32. PubMed PMID: 21802039.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Quadricep and hamstring activation during drop jumps with changes in drop height. AU - Peng,Hsien-Te, AU - Kernozek,Thomas W, AU - Song,Chen-Yi, Y1 - 2010/11/26/ PY - 2010/07/19/received PY - 2010/09/29/revised PY - 2010/10/12/accepted PY - 2011/8/2/entrez PY - 2011/8/2/pubmed PY - 2011/12/21/medline SP - 127 EP - 32 JF - Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine JO - Phys Ther Sport VL - 12 IS - 3 N2 - OBJECTIVE: Compare the muscle activation patterns of the quadricep-hamstring during drop jumps with increasing demands of drop heights. DESIGN: Observational. SETTING: University biomechanics laboratory. PARTICIPANTS: Fifteen male and eight female college physical education students. MAIN OUTCOME MEASURES: Electromyographic activity of the rectus femoris (RF) and biceps femoris (BF) during the landing and takeoff phase of drop jumps from 20 to 60-cm heights. The ground contact time, vertical ground reaction force (vGRF), knee flexion angle during ground contact, and jump height after takeoff were also analyzed. RESULTS: The activation of RF was higher in the drop jump from 60-cm than that from 20- and 30-cm (comparing 107.0 ± 45.9 to 82.3 ± 30.8 and 88.9 ± 38.9 %MVIC, P<.05) during the landing phase. Activation of BF remained similar across all drop heights. Drop jump from 60-cm resulted in greater contact time during takeoff phase and peak vGRF, and resulted in greater maximum knee flexion but straighter knee at ground contact than from lower drop heights. CONCLUSION: At drop height of 60-cm, the altered knee muscular activation and movement patterns may diminish the effectiveness of plyometric training and increase the potential injury risk of knee. SN - 1873-1600 UR - https://www.unboundmedicine.com/medline/citation/21802039/Quadricep_and_hamstring_activation_during_drop_jumps_with_changes_in_drop_height_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1466-853X(10)00104-5 DB - PRIME DP - Unbound Medicine ER -