Aging
Conditions
Keywords
aging, strength training, functionality
Brief summary
Life expectancy and elderly population are increasing. Health professionals try to provide longevity with good quality of life for this population, through the functional independence maintenance. In this context, physical exercise has an important role, specially the strength training. The ability to produce muscle strength is positively associated with the functionality and independence of older people. Different types of strength training can lead to different neuromuscular and functional gains. These types of interventions can help health professionals to determine characteristics of training for the elderly, aiming the maintenance of their functional independence. Thus, the purpose of this study is to determine the effects of a concentric strength training versus a concentric-eccentric strength training for knee flexors and extensors on structural, neuromuscular and functional parameters in older people, as well as to investigate the effect of a detraining period. Additionally, the investigators will try to identify which structural and neuromuscular parameters of lower limbs are better related to the functionality.
Interventions
OTHERConcentric training
Subjects will be submitted to 8 weeks (16 sessions) of a concentric training for knee flexors and knee extensors. This training will be performed in an isokinetic dynamometer at 70% of the subject's maximal voluntary isometric contraction.
OTHERConcentric-Eccentric training
Subjects will be submitted to 8 weeks (16 sessions) of a concentric-eccentric training for knee flexors and knee extensors. This training will be performed in an isokinetic dynamometer at 70% of the subject's maximal voluntary isometric contraction.
Sponsors
Federal University of Rio Grande do Sul
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
MALE
Age
65 Years to 85 Years
Healthy volunteers
Yes
Inclusion criteria
* Male; * 65 years of age or more; * able to walk independently; * not engaged in regular physical exercise.
Exclusion criteria
* Auditory, vestibular, visual and/or neuromusculoskeletal impairments that could influence the tests and the training; * severe cognitive impairment; * lower limb surgery; * osteoporosis; * lower limb pain.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Timed-up-&-go | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Time to rise from a chair, walk 3 meters, turn, walk back and sit again |
| Unipodal static balance | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Range in anterior-posterior and medio-lateral center of pressure movement during unipodal evaluation during 30 seconds |
| Pennation angle of rectus femoris, vastus lateralis and biceps femoris, bilaterally. | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Pennation angle at rest |
| Thickness of rectus femoris, vastus lateralis and biceps femoris, bilaterally. | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Muscle thickness at rest |
| Fascicle length of rectus femoris, vastus lateralis and biceps femoris, bilaterally. | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Fascicle length at rest |
| Echo intensity of rectus femoris, vastus lateralis and biceps femoris, bilaterally. | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Echo intensity determined from a gray scale analysis of the muscles at rest |
| Countermovement vertical jump | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Maximal vertical height in the countermovement jump |
| Gait speed | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Gait speed for walking 10 meters at self-selected speed |
| Stair ascent and descent time | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Time to stair ascent and descent stairs |
| 6-minutes walking test | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | The distance that the subjects can walk during 6 minutes |
| Sit-to-stand | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Maximal number of repetitions during 30 seconds |
| Power of knee extensors and knee flexors | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Power during maximal concentric and eccentric contractions |
| Rate of torque production of knee extensors and knee flexors | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Rate of torque production during maximal isometric contractions |
| Strength of knee extensors and knee flexors | First evaluation, change from first evaluation to baseline, change from baseline to 8 weeks of training, change from 8 weeks of training to 4 weeks of detraining and change from 4 weeks of detraining to 8 weeks of detraining | Maximal isometric strength |
Countries
Brazil
Outcome results
None listed