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Articles 31 - 37 of 37
Full-Text Articles in Physical Therapy
Age And Load Compliance Alter Time To Task Failure For A Submaximal Fatiguing Contraction With The Lower Leg, Erin E. Griffith, Tejin Yoon, Sandra K. Hunter
Age And Load Compliance Alter Time To Task Failure For A Submaximal Fatiguing Contraction With The Lower Leg, Erin E. Griffith, Tejin Yoon, Sandra K. Hunter
Exercise Science Faculty Research and Publications
The purpose of this study was to compare the time to failure and muscle activation of young and old adults for a sustained isometric submaximal contraction with the dorsiflexor muscles when the foot was restrained to a force transducer (force-control task) compared with supporting an equivalent inertial load unrestrained in the sagittal plane (position-control task). Seventeen young (23.6 ± 6.5 yr) and 12 old (70.0 ± 5.0 yr) adults performed the force-control and position-control tasks at 30% maximal voluntary contraction (MVC) until task failure on separate days. Despite the similar load torque for each task, time to failure was longer …
Response To Task-Specific Sex Differences In Muscle Fatigue: Is There A Common Underlying Cause?, Sandra K. Hunter
Response To Task-Specific Sex Differences In Muscle Fatigue: Is There A Common Underlying Cause?, Sandra K. Hunter
Exercise Science Faculty Research and Publications
No abstract provided.
Sex Differences And Mechanisms Of Task-Specific Muscle Fatigue, Sandra K. Hunter
Sex Differences And Mechanisms Of Task-Specific Muscle Fatigue, Sandra K. Hunter
Exercise Science Faculty Research and Publications
Women can be less fatigable than men due to sex-related differences within the neuromuscular system that impact physiological adjustments during a fatiguing task. The involved mechanism(s) for the sex difference, however, is task specific. This review explores the novel hypothesis that variation of the task will alter the magnitude of the sex-difference in muscle fatigue and the contribution of involved mechanisms.
The Role Of Lower Leg Muscle Activity In Blood Pressure Maintenance Of Older Adults, Michelle M. Masterson, Amy L. Morgan, Christine E. Multer, Daniel Cipriani
The Role Of Lower Leg Muscle Activity In Blood Pressure Maintenance Of Older Adults, Michelle M. Masterson, Amy L. Morgan, Christine E. Multer, Daniel Cipriani
Physical Therapy Faculty Articles and Research
Purpose. Age-associated muscle weakness, postural instability, and orthostatic hypotension have been identified as contributing factors to falls , but the relationships among them are not clear. Therefore, the purpose of this study, a two-way factorial design, was to investigate the differences in lower extremity (LE) muscle activity, blood pressure (BP), and heart rate (HR) between young and older individuals in an upright position. Methods. Ten young males (20-24 yrs.) and 10 older males (65-82 yrs.) stood for 15 minutes while BP, HR, and LE electromyography (EMG) were recorded at one minute intervals . A two-way ANOVA was used …
Variability Of Motor Unit Discharge And Force Fluctuations Across A Range Of Muscle Forces In Older Adults, Brian L. Tracy, Katrina S. Maluf, Jennifer L. Stephenson, Sandra K. Hunter
Variability Of Motor Unit Discharge And Force Fluctuations Across A Range Of Muscle Forces In Older Adults, Brian L. Tracy, Katrina S. Maluf, Jennifer L. Stephenson, Sandra K. Hunter
Exercise Science Faculty Research and Publications
Variability of motor unit discharge is a likely contributor to the greater force fluctuations observed in old adults at low muscle forces. We sought to determine whether the variability of motor unit discharge rate underlies the fluctuations in force during steady contractions across a range of forces in young (n = 11) and old (n = 14) adults. The coefficient of variation (CV) for discharge rate and force were measured during a force-matching task as the first dorsal interosseous muscle performed isometric contractions. The recruitment thresholds of the 78 motor units ranged from 0.04% to 34% of maximal …
Time To Task Failure Differs With Load Type When Old Adults Perform A Submaximal Fatiguing Contraction, Sandra K. Hunter, Ludovic Rochette, Ashley Critchlow, Roger M. Enoka
Time To Task Failure Differs With Load Type When Old Adults Perform A Submaximal Fatiguing Contraction, Sandra K. Hunter, Ludovic Rochette, Ashley Critchlow, Roger M. Enoka
Exercise Science Faculty Research and Publications
Young adults exhibit a longer time to task failure when performing a submaximal isometric contraction by pushing against a force transducer (force task) than when supporting an equivalent inertial load (position task). The purpose of this study was to compare the time to failure for old adults when they performed a force task and a position task with the elbow flexor muscles. Eighteen old adults (72 ± 4 years) performed the force and position tasks at 20% maximal voluntary contraction (MVC) force until task failure. The time to task failure was briefer for the position task (10.6 ± 6.1 min) …
A Comparison Of Hip Versus Ankle Exercises In Elders And The Influence On Balance And Gait, Laura Z. Gras, Pamela Levangie, Mary (Tina) Goodwin-Segal, Deborah A. Lawrence
A Comparison Of Hip Versus Ankle Exercises In Elders And The Influence On Balance And Gait, Laura Z. Gras, Pamela Levangie, Mary (Tina) Goodwin-Segal, Deborah A. Lawrence
All PTHMS Faculty Publications
Purpose: Reductions in hip and ankle strength and range of motion (ROM) in elderly subjects have been associated with decreased functional mobility and risk of falls. The purpose of this research was to determine if short duration hip or ankle interventions designed to increase ROM and strength could improve ROM and strength of those joints, as well as improve balance and gait outcomes. Methods: Well elderly volunteers recruited from retirement communities and a senior citizen center were randomly assigned to a hip or ankle intervention group. Both groups performed a home exercise program (HEP) of stretching 5 days a week …