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High-Intensity Multimodal Resistance Training Improves Muscle Function, Symmetry during a Sit-to-Stand Task, and

R A Briggs1, J R Houck, P C LaStayo

  • 1Robert A. Briggs PT PhD, Physical Therapy, David Grant Medical Center, 60th Medical Group, 101 Bodin Circle, Travis AFB, CA 94535, USA;

The Journal of Nutrition, Health & Aging
|February 28, 2018
PubMed
Summary
This summary is machine-generated.

High-intensity resistance training improved muscle performance, limb symmetry, and physical function in older adults after hip fracture. However, involved leg strength remained lower than in healthy controls, suggesting a need for further intervention strategies.

Keywords:
muscle functionsit-to-standsymmetryvertical ground reaction force

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Area of Science:

  • Gerontology
  • Orthopedics
  • Rehabilitation Science

Background:

  • Older adults with hip fractures often experience deficits in physical function and low vertical ground reaction force (vGRF) on the affected limb post-rehabilitation.
  • These impairments can hinder recovery and increase the risk of secondary complications.

Purpose of the Study:

  • To evaluate the effectiveness of a multimodal, high-intensity resistance training program initiated 2-6 months post-hip fracture.
  • To determine if the training improves muscle performance, involved limb vGRF during sit-to-stand, and overall physical function.

Main Methods:

  • A 12-week, high-intensity strength training intervention was conducted in an outpatient university hospital setting.
  • Twenty-four community-dwelling older adults (average age 78.4 years) who had previously completed physical therapy participated.
  • Assessments included sit-to-stand tasks, muscle performance tests, and the modified physical performance test (mPPT) before and after the intervention.

Main Results:

  • Significant improvements were observed in vGRF rate of force development (RFD) and limb loading symmetry (AREA) during sit-to-stand tasks.
  • Participants achieved substantial gains in surgical leg extension power (~65%) and moderate strength increases (~34%), leading to improved strength and power symmetry.
  • Physical function, measured by mPPT, improved significantly from 25 to 30 points (p < 0.001).

Conclusions:

  • High-intensity resistance training can enhance symmetry in sit-to-stand vGRFs, muscle function, and physical function in older adults recovering from hip fracture.
  • Despite improvements, a notable percentage of participants still exhibited low vGRF on the involved side compared to healthy individuals.
  • Further research into alternative strategies is recommended to address persistent deficits in involved limb vGRF.