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Position of the non-stance leg during the single leg squat affects females and males differently.
Hum Mov Sci. 2019 Oct; 67:102506.HM

Abstract

BACKGROUND

Kinematic differences between females and males for the single leg squat (SLS) have been identified. However, kinetic differences between sexes and how variations of the non-stance leg position during the SLS may affect kinematics and kinetics differently in females and males have not been examined.

OBJECTIVES

Examine sex-specific kinematic and kinetic differences during the SLS task with 3 different non-stance leg positions.

DESIGN

Controlled laboratory study, cross-sectional design.

METHODS

Thirty-two healthy adults (16 females, 16 males) performed the 3 SLS tasks while data were collected using a motion capture system and force plates. At 60 degrees of knee flexion (60KF) and peak knee flexion (PKF), kinematics and joint moments were compared between sexes and SLS tasks using a linear regression analysis.

RESULTS

Females exhibited less ipsilateral trunk flexion (P < 0.001) and greater anterior pelvic tilt (P ≤ 0.021) and hip adduction (P < 0.001) than males across tasks at 60KF and PKF. Across tasks, females had a smaller knee flexion moment than males at PKF (P = 0.001). Females had a greater hip abduction moment during SLS-Front than SLS-Middle (P = 0.044) and SLS-Back (P = 0.003) at PKF, but males had similar hip abduction moments across tasks (P ≥ 0.299). At 60KF, males had a greater knee adduction moment during SLS-Front compared to the other tasks (P ≤ 0.019) while females had similar hip abduction moments across tasks (P ≥ 0.459).

CONCLUSION

Altering the non-stance leg position during the SLS affects the kinematics and kinetics of both females and males. The position of the non-stance leg can be modified for assessment and treatment purposes and should be reported in research.

Authors+Show Affiliations

Boston University, Department of Physical Therapy & Athletic Training, PhD Program in Rehabilitation Sciences, College of Health & Rehabilitation Sciences: Sargent College, 635 Commonwealth Ave, Boston, MA 02215, USA. Electronic address: akhuu@bu.edu.Boston University, Department of Physical Therapy & Athletic Training, PhD Program in Rehabilitation Sciences, College of Health & Rehabilitation Sciences: Sargent College, 635 Commonwealth Ave, Boston, MA 02215, USA. Electronic address: lewisc@bu.edu.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

31445486

Citation

Khuu, Anne, and Cara L. Lewis. "Position of the Non-stance Leg During the Single Leg Squat Affects Females and Males Differently." Human Movement Science, vol. 67, 2019, p. 102506.
Khuu A, Lewis CL. Position of the non-stance leg during the single leg squat affects females and males differently. Hum Mov Sci. 2019;67:102506.
Khuu, A., & Lewis, C. L. (2019). Position of the non-stance leg during the single leg squat affects females and males differently. Human Movement Science, 67, 102506. https://doi.org/10.1016/j.humov.2019.102506
Khuu A, Lewis CL. Position of the Non-stance Leg During the Single Leg Squat Affects Females and Males Differently. Hum Mov Sci. 2019;67:102506. PubMed PMID: 31445486.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Position of the non-stance leg during the single leg squat affects females and males differently. AU - Khuu,Anne, AU - Lewis,Cara L, Y1 - 2019/08/21/ PY - 2019/02/17/received PY - 2019/07/22/revised PY - 2019/07/26/accepted PY - 2019/8/25/pubmed PY - 2020/1/21/medline PY - 2019/8/25/entrez KW - Biomechanics KW - Kinematics KW - Kinetics KW - Movement task KW - Single leg squat SP - 102506 EP - 102506 JF - Human movement science JO - Hum Mov Sci VL - 67 N2 - BACKGROUND: Kinematic differences between females and males for the single leg squat (SLS) have been identified. However, kinetic differences between sexes and how variations of the non-stance leg position during the SLS may affect kinematics and kinetics differently in females and males have not been examined. OBJECTIVES: Examine sex-specific kinematic and kinetic differences during the SLS task with 3 different non-stance leg positions. DESIGN: Controlled laboratory study, cross-sectional design. METHODS: Thirty-two healthy adults (16 females, 16 males) performed the 3 SLS tasks while data were collected using a motion capture system and force plates. At 60 degrees of knee flexion (60KF) and peak knee flexion (PKF), kinematics and joint moments were compared between sexes and SLS tasks using a linear regression analysis. RESULTS: Females exhibited less ipsilateral trunk flexion (P < 0.001) and greater anterior pelvic tilt (P ≤ 0.021) and hip adduction (P < 0.001) than males across tasks at 60KF and PKF. Across tasks, females had a smaller knee flexion moment than males at PKF (P = 0.001). Females had a greater hip abduction moment during SLS-Front than SLS-Middle (P = 0.044) and SLS-Back (P = 0.003) at PKF, but males had similar hip abduction moments across tasks (P ≥ 0.299). At 60KF, males had a greater knee adduction moment during SLS-Front compared to the other tasks (P ≤ 0.019) while females had similar hip abduction moments across tasks (P ≥ 0.459). CONCLUSION: Altering the non-stance leg position during the SLS affects the kinematics and kinetics of both females and males. The position of the non-stance leg can be modified for assessment and treatment purposes and should be reported in research. SN - 1872-7646 UR - https://www.unboundmedicine.com/medline/citation/31445486/Position_of_the_non_stance_leg_during_the_single_leg_squat_affects_females_and_males_differently_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0167-9457(19)30111-3 DB - PRIME DP - Unbound Medicine ER -