Muscle architecture and strength: adaptations to short-term resistance training in older adults.
INTRODUCTION
Muscle morphology and architecture changes in response to 6 weeks of progressive resistance training were examined in healthy older adults.


METHODS
In this randomized, controlled design, muscle strength, quality, and architecture were evaluated with knee extension, DEXA, and ultrasound, respectively, in 25 older adults.


RESULTS
Resistance training resulted in significant increases in strength and muscle quality of 32% and 31%, respectively. Cross-sectional area of the vastus lateralis increased by 7.4% (p ≤ 0.05). Physiological cross-sectional area (PCSA) of the thigh, a composite measure of muscle architecture, was related significantly to strength (r = 0.57; p ≤ 0.01) and demonstrated a significant interaction after training (p ≤ 0.05). Change in PCSA of the vastus lateralis was associated with change in strength independent of any other measure.


CONCLUSIONS
Six weeks of resistance training was effective at increasing strength, muscle quality, and muscle morphology in older adult men and women.
['Scanlon|Tyler C|TC|', 'Fragala|Maren S|MS|', 'Stout|Jeffrey R|JR|', 'Emerson|Nadia S|NS|', 'Beyer|Kyle S|KS|', 'Oliveira|Leonardo P|LP|', 'Hoffman|Jay R|JR|']
D000222:Adaptation, Physiological D000368:Aged D005260:Female D006801:Humans D008297:Male D053580:Muscle Strength D052097:Quadriceps Muscle D016059:Range of Motion, Articular D055070:Resistance Training D013997:Time Factors
muscle quality echo intensity exercise sarcopenia ultrasonography