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Related Experiment Video

Updated: Mar 21, 2026

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption

Published on: June 20, 2025

Echo intensity independently predicts functionality in sedentary older men.

Pedro Lopez¹, Eurico Nestor Wilhelm², Anderson Rech¹

¹Exercise Research Laboratory (LAPEX), Federal University of Rio Grande do Sul (UFRGS), Felizardo Street, 750 - Jardim Botânico, CEP: 90690-200, Porto Alegre, RS, Brazil.

|May 5, 2016

Summary

This summary is machine-generated.

Quadriceps echo intensity (QEI) best predicts functional performance in older men. This finding suggests QEI can screen for muscle impairment impacting mobility in this demographic.

Keywords:

aging functionality muscle quality muscular performance ultrasonography

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Area of Science:

Gerontology
Muscle Physiology
Biomedical Engineering

Background:

Maintaining muscle function is crucial for older adults' independence.
Sedentary lifestyles in older men can lead to decreased muscle function and performance.
Identifying reliable indicators of muscle impairment is essential for targeted interventions.

Purpose of the Study:

To investigate associations between quadriceps muscle functionality metrics and functional performance in nonactive older men.
To identify predictors of functional performance in this population.
To evaluate quadriceps echo intensity (QEI) as a potential screening tool.

Main Methods:

Assessed 50 healthy, sedentary older men (mean age 66 years).
Measured quadriceps functional parameters: QEI, rate of torque development (RTD), and 30-second sit-to-stand test (30SS).
Calculated RTD/QEI ratios and performed multiple stepwise linear regression analysis.

Main Results:

30SS performance correlated with RTD, muscle thickness, and various RTD/QEI ratios.
Quadriceps echo intensity (QEI) emerged as the strongest single predictor of functional performance.
QEI explained approximately 30% of the variance in 30SS performance.

Conclusions:

QEI is a significant contributor to the functionality of nonactive older men.
QEI may serve as an effective tool for screening muscle impairment.
Early screening can help identify individuals at risk for decreased functional performance.