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The Effect of Abdominal Muscle Activation Techniques on Trunk and Lower Limb Mechanics During the Single-Leg Squat Task in Females.
J Sport Rehabil 2018; 27(5):438-444JS

Abstract

CONTEXT

Females suffer 4 to 6 times more noncontact anterior cruciate ligament (ACL) injuries than males due to neuromuscular control deficits of the hip musculature leading to increases in hip adduction angle, knee abduction angle, and knee abduction moment during dynamic tasks such as single-leg squats. Lateral trunk displacement has been further related to ACL injury risk in females, leading to the incorporation of core strength/stability exercises in ACL preventative training programs. However, the direct mechanism relating lateral trunk displacement and lower limb ACL risk factors is not well established.

OBJECTIVE

To assess the relationship between lateral trunk displacement and lower limb measures of ACL injury risk by altering trunk control through abdominal activation techniques during single-leg squats in healthy females.

DESIGN

Interventional study setting: movement and posture laboratory.

PARTICIPANTS

A total of 13 healthy females (21.3 [0.88] y, 1.68 [0.07] m, and 58.27 [5.46] kg).

INTERVENTION

Trunk position and lower limb kinematics were recorded using an optoelectric motion capture system during single-leg squats under differing conditions of abdominal muscle activation (abdominal hollowing, abdominal bracing, and control), confirmed using surface electromyography.

MAIN OUTCOME MEASURES

Lateral trunk displacement, peak hip adduction angle, peak knee abduction angle/moment, and average muscle activity from bilateral internal oblique, external oblique, and erector spinae muscles.

RESULTS

No differences were observed for peak lateral trunk displacement, peak hip adduction angle, or peak knee abduction angle/moment. Abdominal hollowing and bracing elicited greater muscle activation than the control condition, and bracing was greater than hollowing in 4 of 6 muscles recorded.

CONCLUSION

The lack of reduction in trunk, hip, and knee measures of ACL injury risk during abdominal hollowing and bracing suggests that these techniques alone may provide minimal benefit in ACL injury prevention training.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28714764

Citation

Linde, Lukas D., et al. "The Effect of Abdominal Muscle Activation Techniques On Trunk and Lower Limb Mechanics During the Single-Leg Squat Task in Females." Journal of Sport Rehabilitation, vol. 27, no. 5, 2018, pp. 438-444.
Linde LD, Archibald J, Lampert EC, et al. The Effect of Abdominal Muscle Activation Techniques on Trunk and Lower Limb Mechanics During the Single-Leg Squat Task in Females. J Sport Rehabil. 2018;27(5):438-444.
Linde, L. D., Archibald, J., Lampert, E. C., & Srbely, J. Z. (2018). The Effect of Abdominal Muscle Activation Techniques on Trunk and Lower Limb Mechanics During the Single-Leg Squat Task in Females. Journal of Sport Rehabilitation, 27(5), pp. 438-444. doi:10.1123/jsr.2016-0038.
Linde LD, et al. The Effect of Abdominal Muscle Activation Techniques On Trunk and Lower Limb Mechanics During the Single-Leg Squat Task in Females. J Sport Rehabil. 2018 Sep 1;27(5):438-444. PubMed PMID: 28714764.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The Effect of Abdominal Muscle Activation Techniques on Trunk and Lower Limb Mechanics During the Single-Leg Squat Task in Females. AU - Linde,Lukas D, AU - Archibald,Jessica, AU - Lampert,Eve C, AU - Srbely,John Z, Y1 - 2018/07/20/ PY - 2017/7/18/pubmed PY - 2018/9/21/medline PY - 2017/7/18/entrez KW - abdomen KW - electromyography KW - kinematics KW - knee joint KW - posture SP - 438 EP - 444 JF - Journal of sport rehabilitation JO - J Sport Rehabil VL - 27 IS - 5 N2 - CONTEXT: Females suffer 4 to 6 times more noncontact anterior cruciate ligament (ACL) injuries than males due to neuromuscular control deficits of the hip musculature leading to increases in hip adduction angle, knee abduction angle, and knee abduction moment during dynamic tasks such as single-leg squats. Lateral trunk displacement has been further related to ACL injury risk in females, leading to the incorporation of core strength/stability exercises in ACL preventative training programs. However, the direct mechanism relating lateral trunk displacement and lower limb ACL risk factors is not well established. OBJECTIVE: To assess the relationship between lateral trunk displacement and lower limb measures of ACL injury risk by altering trunk control through abdominal activation techniques during single-leg squats in healthy females. DESIGN: Interventional study setting: movement and posture laboratory. PARTICIPANTS: A total of 13 healthy females (21.3 [0.88] y, 1.68 [0.07] m, and 58.27 [5.46] kg). INTERVENTION: Trunk position and lower limb kinematics were recorded using an optoelectric motion capture system during single-leg squats under differing conditions of abdominal muscle activation (abdominal hollowing, abdominal bracing, and control), confirmed using surface electromyography. MAIN OUTCOME MEASURES: Lateral trunk displacement, peak hip adduction angle, peak knee abduction angle/moment, and average muscle activity from bilateral internal oblique, external oblique, and erector spinae muscles. RESULTS: No differences were observed for peak lateral trunk displacement, peak hip adduction angle, or peak knee abduction angle/moment. Abdominal hollowing and bracing elicited greater muscle activation than the control condition, and bracing was greater than hollowing in 4 of 6 muscles recorded. CONCLUSION: The lack of reduction in trunk, hip, and knee measures of ACL injury risk during abdominal hollowing and bracing suggests that these techniques alone may provide minimal benefit in ACL injury prevention training. SN - 1543-3072 UR - https://www.unboundmedicine.com/medline/citation/28714764/The_Effect_of_Abdominal_Muscle_Activation_Techniques_on_Trunk_and_Lower_Limb_Mechanics_During_the_Single_Leg_Squat_Task_in_Females_ L2 - https://journals.humankinetics.com/doi/10.1123/jsr.2016-0038 DB - PRIME DP - Unbound Medicine ER -