Resistance and functional training reduces knee extensor position fluctuations in functionally limited older adults

Area of Science:

• Gerontology
• Exercise Physiology
• Rehabilitation Science

Background:

• Functional limitations in older adults often involve decreased muscle strength and control.
• Improving muscle steadiness is crucial for maintaining independence and preventing falls in elderly populations.

Purpose of the Study:

• To investigate the impact of task-specific training on knee extensor steadiness adaptations.
• To compare the effects of resistance training (RT), functional training (FT), and combined functional plus resistance training (FRT) on muscle steadiness.

Main Methods:

• Twenty-four functionally limited older adults participated in a 10-week control period followed by 10 weeks of RT, FT, or FRT.
• Knee extensor steadiness was assessed during isometric, shortening, and lengthening contractions at various maximal voluntary contraction (MVC) intensities.
• Training interventions involved specific exercises targeting knee extensor muscles and functional movements.

Main Results:

• No improvements in isometric steadiness were observed across any training groups.
• Resistance training (RT) significantly reduced fluctuations during shortening and lengthening contractions.
• Combined functional plus resistance training (FRT) showed significant improvements in shortening contractions, while functional training (FT) alone did not improve dynamic steadiness.
• Individuals with lower baseline steadiness exhibited greater training-induced improvements.

Conclusions:

• Task-specific training, particularly resistance exercise, can enhance knee extensor steadiness in functionally limited older adults.
• The type of training influences the adaptations in muscle steadiness, with combined approaches showing promise.
• Interventions should consider individual baseline steadiness for optimizing outcomes in older adult populations.