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J Athl Train. 2012 Jul-Aug;47(4):406-13. doi: 10.4085/1062-6050-47.4.17.

Lower extremity muscle activation and knee flexion during a jump-landing task.

Author information

1
Campus Health Services, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

Abstract

CONTEXT:

Decreased sagittal-plane motion at the knee during dynamic tasks has been reported to increase impact forces during landing, potentially leading to knee injuries such as anterior cruciate ligament rupture.

OBJECTIVE:

To describe the relationship between lower extremity muscle activity and knee-flexion angle during a jump-landing task.

DESIGN:

Cross-sectional study.

SETTING:

Research laboratory.

PATIENTS OR OTHER PARTICIPANTS:

Thirty recreationally active volunteers (15 men, 15 women: age = 21.63 ± 2.01 years, height = 173.95 ± 11.88 cm, mass = 72.57 ± 14.25 kg).

INTERVENTION(S):

Knee-flexion angle and lower extremity muscle activity were collected during 10 trials of a jump-landing task.

MAIN OUTCOME MEASURE(S):

Simple correlation analyses were performed to determine the relationship between each knee-flexion variable (initial contact, peak, and displacement) and electromyographic amplitude of the gluteus maximus (GMAX), quadriceps (VMO and VL), hamstrings, gastrocnemius, and quadriceps : hamstring (Q : H) ratio. Separate forward stepwise multiple regressions were conducted to determine which combination of muscle activity variables predicted each knee-flexion variable.

RESULTS:

During preactivation, VMO and GMAX activity and the Q : H ratio were negatively correlated with knee-flexion angle at initial contact (VMO: r = 0.382, P = .045; GMAX: r = 0.385, P = .043; Q : H ratio: r = 0.442, P = .018). The VMO, VL, and GMAX deceleration values were negatively correlated with peak knee-flexion angle (VMO: r = 0.687, P = .001; VL: r = 0.467, P = .011; GMAX: r = 0.386, P = .043). The VMO and VL deceleration values were negatively correlated with knee-flexion displacement (VMO: r = 0.631, P = .001; VL: r = 0.453, P = .014). The Q : H ratio and GM activity predicted 34.7% of the variance in knee-flexion angle at initial contact (P = .006). The VMO activity predicted 47.1% of the variance in peak knee-flexion angle (P = .001). The VMO and VL activity predicted 49.5% of the variance in knee-flexion displacement (P = .001).

CONCLUSIONS:

Greater quadriceps and GMAX activation and less hamstrings and gastrocnemius activation were correlated with smaller knee-flexion angles. This landing strategy may predispose an individual to increased impact forces due to the negative influence on knee-flexion position.

PMID:
22889656
PMCID:
PMC3396300
DOI:
10.4085/1062-6050-47.4.17
[Indexed for MEDLINE]
Free PMC Article

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