Leg Strength is Associated with Ventilatory Efficiency in Older Women

• Published in: International journal of sports medicine 2012-07, Vol.33 (7), p.537-542
• Main Authors: Gonzales, J. U., Tucker, S. H., Kalasky, M. J., Proctor, D. N.
• Format: Article
• Language: English
• Subjects: Age Factors; Aged; Aged, 80 and over; Anaerobic Threshold; Biological and medical sciences; Carbon Dioxide - metabolism; Efficiency; Exercise (intensity); Exercise Test; Female; Fundamental and applied biological sciences. Psychology; Gerontology; Health; Humans; Knee - physiology; Knees; Leg; Legs; Male; Men; Middle Aged; Muscle Strength - physiology; Physiology & Biochemistry; Pulmonary Ventilation - physiology; Sex Factors; Strength; Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports; Women
• ISSN: 0172-4622; 1439-3964
• DOI: 10.1055/s-0032-1304659

Abstract The aim of the present study was to determine if leg function is associated with ventilatory efficiency during exercise in healthy older adults. 24 women and 18 men aged 60–80 years performed treadmill exercise to fatigue for calculation of ventilatory efficiency using the ratio of ventilation to carbon dioxide at the anaerobic threshold (VE/VCO 2 @AT). On a separate day, participants performed leg strength testing and graded single-leg knee extension exercise. The VE/VCO 2 @AT was higher in women than men (33±3 vs. 30±3; p=0.03). After adjustment for age and VO 2max , leg strength (knee extensor isometric force) was inversely associated with VE/VCO 2 @AT in women (r= − 0.44, p=0.03) while no relationships were found for men. Strength-matched women and men had similar VE/VCO 2 @AT indicating that the correlation between leg strength and VE/VCO 2 @AT was strength- but not sex-specific. During knee extensor exercise, women with lower leg strength had increased VE/VCO 2 slope across 0–15 W as compared to higher strength women (38±8 vs. 31±3; p