Brian L TracySummaryAffiliation: University of Colorado Country: USA Publications
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Publications
Older adults are less steady during submaximal isometric contractions with the knee extensor musclesBrian L Tracy
Department of Kinesiology and Applied Physiology, University of Colorado, Boulder, Colorado 80309 0354, USA
J Appl Physiol 92:1004-12. 2002..These results indicate that, whereas the ability to exert steady submaximal forces with the knee extensor muscles was reduced in old adults, fluctuations in knee joint angle during slow movements were similar for young and old adults...- A more efficient magnetic resonance imaging-based strategy for measuring quadriceps muscle volumeBrian L Tracy
Department of Kinesiology, University of Maryland, College Park, MD, USA
Med Sci Sports Exerc 35:425-33. 2003..To determine the accuracy of several magnetic resonance imaging (MRI)-based strategies for assessment of quadriceps muscle volume (MV) and changes in MV with training... - Strength training reduces force fluctuations during anisometric contractions of the quadriceps femoris muscles in old adultsBrian L Tracy
Department of Integrative Physiology, University of Colorado, Boulder, Colorado 80309 0354, USA
J Appl Physiol 96:1530-40. 2004..Thus strength training reduced the force fluctuations of the quadriceps femoris muscles during anisometric contractions but not during isometric contractions... - Variability of motor unit discharge and force fluctuations across a range of muscle forces in older adultsBrian L Tracy
Department of Integrative Physiology, University of Colorado, Boulder, Colorado 80523 1582, USA
Muscle Nerve 32:533-40. 2005..These findings underscore the contribution of variability of motor unit activity to motor output in normal human aging... - Mechanisms that contribute to differences in motor performance between young and old adultsRoger M Enoka
Department of Kinesiology and Applied Physiology University of Colorado, Boulder, CO 80309 0354, USA
J Electromyogr Kinesiol 13:1-12. 2003.... - Force control is impaired in the ankle plantarflexors of elderly adultsBrian L Tracy
Department of Health and Exercise Science, Colorado State University, 220 Moby B Complex, Fort Collins, CO 80523 1582, USA
Eur J Appl Physiol 101:629-36. 2007..For elderly adults, the neuromuscular factors that underlie both muscle strength and force fluctuations during low-force contractions are impaired in the ankle plantarflexors but not the dorsiflexors... - Aging, visuomotor correction, and force fluctuations in large musclesBrian L Tracy
Department of Health and Exercise Science, Colorado State University, Fort Collins, CO 80523 1582, USA
Med Sci Sports Exerc 39:469-79. 2007..To determine the contribution of visuomotor correction to increased force fluctuations in the elbow flexor and knee extensor muscles of elderly adults... - Variability of quadriceps femoris motor neuron discharge and muscle force in human agingSeth J Welsh
Department of Health and Exercise Science, Colorado State University, 220 Moby B Complex, Fort Collins, CO 80523 1582, USA
Exp Brain Res 179:219-33. 2007..The presence of visual feedback appears to be necessary to find greater discharge variability in motor units from the knee extensors of elderly adults... - The amplitude of force variability is correlated in the knee extensor and elbow flexor musclesBrian L Tracy
Department of Health and Exercise Science, Colorado State University, 220 Moby B Complex, Fort Collins, CO 80523 1582, USA
Exp Brain Res 176:448-64. 2007..The dominant frequency of fluctuations was similar for the EF and KE muscles. The correlated fluctuations for the EF and KE muscles, within subjects, suggests that the two motor neuron pools transform the various neural inputs similarly... - Steadiness training with light loads in the knee extensors of elderly adultsBrian L Tracy
Department of Health and Exercise Science, Colorado State University, Fort Collins, CO 80523 1582, USA
Med Sci Sports Exerc 38:735-45. 2006..This study was conducted to determine the effect of steadiness training with light loads in the knee extensors of elderly adults... - Age and sex affect human muscle fibre adaptations to heavy-resistance strength trainingGregory F Martel
Department of Physical Therapy, University of Maryland Eastern Shore, Princess Anne, MD 21853, USA
Exp Physiol 91:457-64. 2006..01). In summary, ST led to significant increases in 1-RM and type II fibre CSA in all groups; however, age and sex influence specific muscle fibre subtype responses to ST... - Resistance and functional training reduces knee extensor position fluctuations in functionally limited older adultsTodd M Manini
Musculoskeletal Research Laboratory, Syracuse University, Syracuse, NY, USA
Eur J Appl Physiol 95:436-46. 2005.... - Visuomotor contribution to force variability in the plantarflexor and dorsiflexor musclesBrian L Tracy
Department of Health and Exercise Science, 220 Moby B Complex, Colorado State University, Fort Collins, CO 80523 1582, USA
Hum Mov Sci 26:796-807. 2007..Thus, visuomotor correction contributes to the variability of force during isometric contractions of the ankle dorsiflexors and plantarflexors...