The effect of plantar flexor muscle fatigue on postural control and muscular activation pattern during external perturbation in healthy students (20-35 Y/O) of Shiraz Rehabilitation School
Aim: The purpose of this study is to identify the effect of localized muscle fatigue on postural stability and muscular activation patterns before, during and after sudden hand loading.
Study design: Quasi- experimental, subjects randomly will select among students of Shiraz Faculty of Rehabilitation.
Method: Fifteen healthy young adults (20-35 years) will recruite to participate in this study. The exclusion criteria are experience of any surgery in the trunk and lower extremity, history of injury or pain to the trunk and lower extremity for at least previous 6 months, musculoskeletal , neurological or other impairments that could affect the postural control.
Subjects will sit on the bed and maximum voluntary contractions (MVC) will collect from both plantar flexor muscles. In the next step, we will have 3 experiment consist of: pre-fatigue test, the fatigue protocol and post-fatigue test. In all experiments, subjects will stand on a force platform with feet shoulder width apart and surface electromyographic activities from the following muscles will record: transvers abdominals, semitendinosus, erector spinae and soleus.
In the pre and post fatigue situations, the subjects will expose to a rapid loading in to the right palm (25% of body weight) with two expected and unexpected conditions. The fatigue protocol consists of three sets of isometric submaximal plantar flexion to make the subjects fatigued. In this experiment the total time for each subject will be about one hour
General information
Acronym
IRCT registration information
IRCT registration number:IRCT201109196767N1
Registration date:2011-10-12, 1390/07/20
Registration timing:prospective
Last update:
Update count:0
Registration date
2011-10-12, 1390/07/20
Registrant information
Name
Samaneh Ebrahimi
Name of organization / entity
Shiraz University of Medical Sciences
Country
Iran (Islamic Republic of)
Phone
+98 71 3627 1551
Email address
ebrahimis@sums.ac.ir
Recruitment status
Recruitment complete
Funding source
Shiraz University of Medical Sciences
Expected recruitment start date
2011-10-22, 1390/07/30
Expected recruitment end date
2011-12-21, 1390/09/30
Actual recruitment start date
empty
Actual recruitment end date
empty
Trial completion date
empty
Scientific title
The effect of plantar flexor muscle fatigue on postural control and muscular activation pattern during external perturbation in healthy students (20-35 Y/O) of Shiraz Rehabilitation School
Public title
The effect of ankle muscle fatigue on postural control and muscular activation patterns
Purpose
Prevention
Inclusion/Exclusion criteria
Inclusion criteria: Healthy students aged 20-35 years old
Exclusion criteria: Any deviation in the lower extremities and spine alignment;
History of pain and trauma to the lower extremities and trunk in the past six months; Musculoskeletal and neuromuscular disorders; History of diseases that involve vestibular system, eyes, central nervous system and peripheral nervous system; Inner ear disease; History of surgery in the lower extremities and trunk;
History of back pain in past 6 months; Doing regular exercise at least 3 times a week for 30-45 minutes
Age
From 20 years old to 35 years old
Gender
Both
Phase
N/A
Groups that have been masked
No information
Sample size
Target sample size:
15
Randomization (investigator's opinion)
N/A
Randomization description
Blinding (investigator's opinion)
Not blinded
Blinding description
Placebo
Not used
Assignment
Single
Other design features
Secondary Ids
empty
Ethics committees
1
Ethics committee
Name of ethics committee
Shiraz University of Medical Sciences
Street address
Zand Ave
City
Shiraz
Postal code
Approval date
2010-09-15, 1389/06/24
Ethics committee reference number
CT-90-5682
Health conditions studied
1
Description of health condition studied
Normal subjects
ICD-10 code
ICD-10 code description
Primary outcomes
1
Description
Bilateral transverse abdominals muscle activation
Timepoint
Before and after expected and unexpected sudden hand loading (before and after plantar flexor muscle fatigue)
Method of measurement
Telemetry EMG (Mega electronics Ltd.Finland)
2
Description
Bilateral semitendinosus muscle activation
Timepoint
Before and after expected and un expected sudden hand loading (before and after plantar muscle fatigue)
Method of measurement
Telemetry EMG (Mega electronics Ltd.Finland)
3
Description
Center of pressure displacement
Timepoint
Before and after expected and unexpected sudden hand loading (before and after plantar flexor muscle fatigue)
Method of measurement
Kistler force plate (9286AA,Sweden)
4
Description
Center of pressure velocity
Timepoint
Before and after expected and unexpected sudden hand loading (before after plantar flexor muscle fatigue)
Method of measurement
Kistler force plate (9286AA,Sweden)
5
Description
Bilateral erector spinae muscle activation
Timepoint
Before and after expected and unexpected sudden hand loading (before and after plantar flexor muscle fatigue)
Method of measurement
Telemetry EMG (Mega electronics Ltd.Finland)
6
Description
Bilateral soleus muscle activation
Timepoint
Before and after expected and unexpected sudden hand loading (before and after plantar flexor muscle fatigue)
Method of measurement
Telemetry EMG (Mega electronics Ltd.Finland)
Secondary outcomes
empty
Intervention groups
1
Description
External perturbation (expected and unexpected): Subjects expose to a rapid loading in to the right palm (25% of body weight) from 20 cm obove his/har right palm, while the shoulder is in 90 flexion. In expected condition the subjects are aware of loading time (3 seconds after the beep sound the loading will occure). But in unexpected condition the subjects do not any thing about the loading time.
Category
Diagnosis
2
Description
Making the plantar flexor muscles fatigued: The person sitting on the bed with the thigh and leg on the it. One end of the load cell strap will be fixed to the bar behind the person and the other end will be fixed below the ankles. The maximum voluntary contraction of both flexor muscles will be evaluated using the electrical load cell. Then, 60 percent of this amount is applied to fatigue the muscles; The person will asked to apply pressure to the strap while maintain 60 percent of his/her maximum voluntary contraction by looking at the bar scale on the monitor until feel fatigue. When the bar scale is in green territory the person would maintain the contraction. But if it is in red territory and last for 5 seconds it assumes as fatigue
Category
Other
Recruitment centers
1
Recruitment center
Name of recruitment center
Shiraz School of Rehabilitation
Full name of responsible person
Fatemeh Amiri
Street address
Shiraz School of Rehabilitation, First Abiverdi Ave. Chamran Boulevard.
City
Shiraz
Sponsors / Funding sources
1
Sponsor
Name of organization / entity
Shiraz University of Medical Sciences
Full name of responsible person
Dr Gholam Reza Hatam
Street address
Shiraz University of Medical Sciences, Zand Ave
City
Shiraz
Grant name
Grant code / Reference number
Is the source of funding the same sponsor organization/entity?
Yes
Title of funding source
Shiraz University of Medical Sciences
Proportion provided by this source
100
Public or private sector
empty
Domestic or foreign origin
empty
Category of foreign source of funding
empty
Country of origin
Type of organization providing the funding
empty
Person responsible for general inquiries
Contact
Name of organization / entity
Shiraz University of Medical Sciences
Full name of responsible person
Dr Zahra Rojhani
Position
Assistant Ppofessor of Shiraz University of Medical Sciences
Other areas of specialty/work
Street address
First Abiverdi, Chamran Boulevard
City
Shiraz
Postal code
Phone
+98 71 1627 1551
Fax
Email
rojhaniz@sums.ac.ir
Web page address
Person responsible for scientific inquiries
Contact
Name of organization / entity
Shiraz University of Medical Sciences
Full name of responsible person
Dr Zahra Rojhani
Position
Assistant professor of Shiraz University of Medical Sciences
Other areas of specialty/work
Street address
First Abiverdi, Chamran Boulevard
City
Shiraz
Postal code
Phone
+98 71 1626 5108
Fax
Email
rojhaniz@sums.ac.ir
Web page address
Person responsible for updating data
Contact
Name of organization / entity
Shiraz University of Medical Sciences
Full name of responsible person
Dr Zahra Rojhani
Position
Assistant professor of Shiraz University of Medical Sciences
Other areas of specialty/work
Street address
First Abiverdi, Chamran Boulevard
City
Shiraz
Postal code
Phone
+98 71 1626 5108
Fax
Email
rojhaniz@sums.ac.ir
Web page address
Sharing plan
Deidentified Individual Participant Data Set (IPD)