Ignite Creation Date:
2024-05-05 @ 6:36 PM
Last Modification Date:
2024-10-26 @ 9:35 AM
Study NCT ID:
NCT00512018
Status:
COMPLETED
Last Update Posted:
2013-04-18
First Post:
2007-08-03
Brief Title:
Neuromuscular Electrical Stimulation and Isokinetic Training
Sponsor:
Universidade Federal de Sao Carlos
Organization:
Universidade Federal de Sao Carlos
Study Overview
Official Title:
Neuromuscular Electrical Stimulation and Isokinetic Training Effects on Strength and Neuromuscular Properties
Status:
COMPLETED
Status Verified Date:
2013-04
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
The purpose of this study was to assess the effects of Neuromuscular Electrical Stimulation NMES associated to an isokinetic training program in both young healthy men and women Twenty subjects 10 men 10 women 2115 years submitted both quadriceps femoris muscles to a strengthening program 3 sets of 10 isokinetic concentric repetitions at 30s two days per week for 4 weeks One limb was submitted only to the strength training EX while the other underwent the same training program but with NMES added to each contraction ExNMES The current used for NMES was Russian Current frequency of 2500 Hz 50 burstss and pulse duration of 200 µs The evaluation protocol included isometric and isokinetic concentric extensor torques at 30s Men increased their torque in both tested modalities in both limbs with no difference between them The angle of peak torque increased for the EX limb showing an altered tension-length relationship which did not occur for the ExNMES limb or for women Women increased their torque for EX limb in both modalities which only occured for isometric mode in the ExNMES limb However they showed a decrease in their acceleration time in ExNMES limbs showing they could produce a muscular contraction more readily than they did before training The results of this study found that the association between NMES and isokinetic concentric voluntary strength training does not improve strength gains of voluntary training itself for young healthy subjects of both genders However it could improve neuromuscular readiness to produce torque in women
Detailed Description:
Subjects Twenty active and healthy undergraduate students men 21 19 years 177 01 m 73 84 kg 233 14 kgm² women 209 07 years 164 01 m 563 55 kg 21 10 kgm² were selected for this study All of them underwent physical examination before the study and had already participated in strength training programs before this study All 10 men selected concluded the study Although 15 women were selected and began the training program 5 were excluded 3 reported episodes of pain in the knee joint during training sessions and 2 of them could not conclude the training program for personal reasons Therefore the final data refers to 10 women
All procedures for evaluation and training were explained before and a consent term was signed The project was approved by the Ethics Committee for Medical Research of Federal University of São Carlos and is in agreement with the Declaration of Helsinki
Evaluation protocol Before all evaluations subjects were familiarized with testing and training procedures All the evaluation and training procedures were applied for both right and left limbs of subjects before and after training program To avoid possible dominance effects volunteers were randomly separated to determine in which limb right or left training would be associated with NMES The investigator who made the data analysis was blind to this randomization
After 5 min period of warm-up in a stationary bicycle at a speed of 20 kmh and load of 20 W the subjects stretched the quadriceps femoris and the hamstring muscles of both limbs Each muscle group was stretched 3 times of 30 s alternately Afterwards the subject was positioned in an isokinetic dynamometer Biodex Multi-joint System 3 Biodex Shirley NY with the angulation of 100º on hips Trunk pelvis and thigh of subjects were stabilized by strips following equipment description36 Rotation axis of dynamometer was aligned with axis of the knee at the level of lateral epicondyle of the femur while the attachment was fixed at the distal part of leg of subjects about 5 cm above medial malleolus The gravity effect correction was calculated with the limb at 60 of flexion The isokinetic device was calibrated before each evaluation and training session as requested by the manufacturer
After that volunteers had their knees positioned at 60 and were familiarized to the action they would do After that they were asked to perform 3 maximum voluntary isometric knee extension contractions for 5 s with 1 min of rest interval between the contractions Three min after the last contraction subjects were familiarized with the isokinetic contraction and then performed 5 maximum isokinetic concentric knee extension contractions at 30ºs speed from 90 to 15 0 being full extension totaling up 75 of Range of Motion ROM Verbal encouragement37 as well as visual feedback from the equipment38 were given in an attempt to achieve a maximal voluntary effort level during all contractions each subject was asked to perform The same procedures were repeated with the contralateral limb
All procedures for evaluation and training were explained before and a consent term was signed The project was approved by the Ethics Committee for Medical Research of Federal University of São Carlos and is in agreement with the Declaration of Helsinki
Evaluation protocol Before all evaluations subjects were familiarized with testing and training procedures All the evaluation and training procedures were applied for both right and left limbs of subjects before and after training program To avoid possible dominance effects volunteers were randomly separated to determine in which limb right or left training would be associated with NMES The investigator who made the data analysis was blind to this randomization
After 5 min period of warm-up in a stationary bicycle at a speed of 20 kmh and load of 20 W the subjects stretched the quadriceps femoris and the hamstring muscles of both limbs Each muscle group was stretched 3 times of 30 s alternately Afterwards the subject was positioned in an isokinetic dynamometer Biodex Multi-joint System 3 Biodex Shirley NY with the angulation of 100º on hips Trunk pelvis and thigh of subjects were stabilized by strips following equipment description36 Rotation axis of dynamometer was aligned with axis of the knee at the level of lateral epicondyle of the femur while the attachment was fixed at the distal part of leg of subjects about 5 cm above medial malleolus The gravity effect correction was calculated with the limb at 60 of flexion The isokinetic device was calibrated before each evaluation and training session as requested by the manufacturer
After that volunteers had their knees positioned at 60 and were familiarized to the action they would do After that they were asked to perform 3 maximum voluntary isometric knee extension contractions for 5 s with 1 min of rest interval between the contractions Three min after the last contraction subjects were familiarized with the isokinetic contraction and then performed 5 maximum isokinetic concentric knee extension contractions at 30ºs speed from 90 to 15 0 being full extension totaling up 75 of Range of Motion ROM Verbal encouragement37 as well as visual feedback from the equipment38 were given in an attempt to achieve a maximal voluntary effort level during all contractions each subject was asked to perform The same procedures were repeated with the contralateral limb
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None