Relative electromyographic activity in trunk, hip, and knee muscles during unilateral weight bearing exercises: Implications for rehabilitation

Lori Ann Bolgla, Mario F. Cruz, Lauren Hayes Roberts, Angela Minning Buice, Tori Smith Pou

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Background: Clinicians routinely prescribe unilateral weight bearing exercises to strengthen the lower extremity. Researchers have primarily examined thigh muscle activation with minimal attention to the hip and trunk muscles. The purpose of this study was to quantify trunk, hip, and thigh muscle activation during these types of exercises. Methods: Electromyographic (EMG) activity was collected for the abdominal obliques (AO), lumbar extensors (LE), gluteus maximus (GMX), gluteus medius (GM), and vastus medialis (VM) as subjects performed four unilateral weight bearing exercises. Data were expressed as 100% of a maximum voluntary isometric contraction (% MVIC). Separate analyses of variance with repeated measures were used to identify muscle activity differences across exercise. The sequentially-rejective Bonferroni test was used for all post-hoc analyses. Results: EMG activity for the AO, LE, and GMX was low (5.7-18.9% MVIC) during all the exercises. The GM activity was moderate (21.4-26.5% MVIC) while VM activity was high (40.0-45.2% MVIC). Conclusion: Lower AO and LE activation most likely resulted from subjects maintaining a vertical trunk position over the stance limb during each exercise. The fact that the exercises required greater frontal plane control (from balancing on a single limb) most likely accounted for lower GMX activity. The exercises would provide little, if any, benefit for individuals with AO, LE, or GMX weakness. The unilateral weight bearing exercises would be beneficial for GM neuromuscular re-education and endurance and VM strengthening.

Original languageEnglish (US)
Pages (from-to)130-138
Number of pages9
JournalPhysiotherapy Theory and Practice
Volume32
Issue number2
DOIs
StatePublished - Jan 1 2016

Fingerprint

Exercise Therapy
Weight-Bearing
Hip
Knee
Quadriceps Muscle
Muscles
Thigh
Extremities
Isometric Contraction
Lower Extremity
Analysis of Variance
Research Personnel
Education

Keywords

  • EMG
  • lower extremity
  • rehabilitation

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Relative electromyographic activity in trunk, hip, and knee muscles during unilateral weight bearing exercises : Implications for rehabilitation. / Bolgla, Lori Ann; Cruz, Mario F.; Roberts, Lauren Hayes; Buice, Angela Minning; Pou, Tori Smith.

In: Physiotherapy Theory and Practice, Vol. 32, No. 2, 01.01.2016, p. 130-138.

Research output: Contribution to journalArticle

Bolgla, Lori Ann ; Cruz, Mario F. ; Roberts, Lauren Hayes ; Buice, Angela Minning ; Pou, Tori Smith. / Relative electromyographic activity in trunk, hip, and knee muscles during unilateral weight bearing exercises : Implications for rehabilitation. In: Physiotherapy Theory and Practice. 2016 ; Vol. 32, No. 2. pp. 130-138.
@article{10cb40a1fba84e5fba5e3fa1e3a81b4e,
title = "Relative electromyographic activity in trunk, hip, and knee muscles during unilateral weight bearing exercises: Implications for rehabilitation",
abstract = "Background: Clinicians routinely prescribe unilateral weight bearing exercises to strengthen the lower extremity. Researchers have primarily examined thigh muscle activation with minimal attention to the hip and trunk muscles. The purpose of this study was to quantify trunk, hip, and thigh muscle activation during these types of exercises. Methods: Electromyographic (EMG) activity was collected for the abdominal obliques (AO), lumbar extensors (LE), gluteus maximus (GMX), gluteus medius (GM), and vastus medialis (VM) as subjects performed four unilateral weight bearing exercises. Data were expressed as 100{\%} of a maximum voluntary isometric contraction ({\%} MVIC). Separate analyses of variance with repeated measures were used to identify muscle activity differences across exercise. The sequentially-rejective Bonferroni test was used for all post-hoc analyses. Results: EMG activity for the AO, LE, and GMX was low (5.7-18.9{\%} MVIC) during all the exercises. The GM activity was moderate (21.4-26.5{\%} MVIC) while VM activity was high (40.0-45.2{\%} MVIC). Conclusion: Lower AO and LE activation most likely resulted from subjects maintaining a vertical trunk position over the stance limb during each exercise. The fact that the exercises required greater frontal plane control (from balancing on a single limb) most likely accounted for lower GMX activity. The exercises would provide little, if any, benefit for individuals with AO, LE, or GMX weakness. The unilateral weight bearing exercises would be beneficial for GM neuromuscular re-education and endurance and VM strengthening.",
keywords = "EMG, lower extremity, rehabilitation",
author = "Bolgla, {Lori Ann} and Cruz, {Mario F.} and Roberts, {Lauren Hayes} and Buice, {Angela Minning} and Pou, {Tori Smith}",
year = "2016",
month = "1",
day = "1",
doi = "10.3109/09593985.2015.1092059",
language = "English (US)",
volume = "32",
pages = "130--138",
journal = "Physiotherapy Theory and Practice",
issn = "0959-3985",
publisher = "Informa Healthcare",
number = "2",

}

TY - JOUR

T1 - Relative electromyographic activity in trunk, hip, and knee muscles during unilateral weight bearing exercises

T2 - Implications for rehabilitation

AU - Bolgla, Lori Ann

AU - Cruz, Mario F.

AU - Roberts, Lauren Hayes

AU - Buice, Angela Minning

AU - Pou, Tori Smith

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Background: Clinicians routinely prescribe unilateral weight bearing exercises to strengthen the lower extremity. Researchers have primarily examined thigh muscle activation with minimal attention to the hip and trunk muscles. The purpose of this study was to quantify trunk, hip, and thigh muscle activation during these types of exercises. Methods: Electromyographic (EMG) activity was collected for the abdominal obliques (AO), lumbar extensors (LE), gluteus maximus (GMX), gluteus medius (GM), and vastus medialis (VM) as subjects performed four unilateral weight bearing exercises. Data were expressed as 100% of a maximum voluntary isometric contraction (% MVIC). Separate analyses of variance with repeated measures were used to identify muscle activity differences across exercise. The sequentially-rejective Bonferroni test was used for all post-hoc analyses. Results: EMG activity for the AO, LE, and GMX was low (5.7-18.9% MVIC) during all the exercises. The GM activity was moderate (21.4-26.5% MVIC) while VM activity was high (40.0-45.2% MVIC). Conclusion: Lower AO and LE activation most likely resulted from subjects maintaining a vertical trunk position over the stance limb during each exercise. The fact that the exercises required greater frontal plane control (from balancing on a single limb) most likely accounted for lower GMX activity. The exercises would provide little, if any, benefit for individuals with AO, LE, or GMX weakness. The unilateral weight bearing exercises would be beneficial for GM neuromuscular re-education and endurance and VM strengthening.

AB - Background: Clinicians routinely prescribe unilateral weight bearing exercises to strengthen the lower extremity. Researchers have primarily examined thigh muscle activation with minimal attention to the hip and trunk muscles. The purpose of this study was to quantify trunk, hip, and thigh muscle activation during these types of exercises. Methods: Electromyographic (EMG) activity was collected for the abdominal obliques (AO), lumbar extensors (LE), gluteus maximus (GMX), gluteus medius (GM), and vastus medialis (VM) as subjects performed four unilateral weight bearing exercises. Data were expressed as 100% of a maximum voluntary isometric contraction (% MVIC). Separate analyses of variance with repeated measures were used to identify muscle activity differences across exercise. The sequentially-rejective Bonferroni test was used for all post-hoc analyses. Results: EMG activity for the AO, LE, and GMX was low (5.7-18.9% MVIC) during all the exercises. The GM activity was moderate (21.4-26.5% MVIC) while VM activity was high (40.0-45.2% MVIC). Conclusion: Lower AO and LE activation most likely resulted from subjects maintaining a vertical trunk position over the stance limb during each exercise. The fact that the exercises required greater frontal plane control (from balancing on a single limb) most likely accounted for lower GMX activity. The exercises would provide little, if any, benefit for individuals with AO, LE, or GMX weakness. The unilateral weight bearing exercises would be beneficial for GM neuromuscular re-education and endurance and VM strengthening.

KW - EMG

KW - lower extremity

KW - rehabilitation

UR - http://www.scopus.com/inward/record.url?scp=84959132306&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84959132306&partnerID=8YFLogxK

U2 - 10.3109/09593985.2015.1092059

DO - 10.3109/09593985.2015.1092059

M3 - Article

C2 - 26761186

AN - SCOPUS:84959132306

VL - 32

SP - 130

EP - 138

JO - Physiotherapy Theory and Practice

JF - Physiotherapy Theory and Practice

SN - 0959-3985

IS - 2

ER -