<clinical_study>
  <!-- This xml conforms to an XML Schema at:
    https://clinicaltrials.gov/ct2/html/images/info/public.xsd -->
  <required_header>
    <download_date>ClinicalTrials.gov processed this data on September 20, 2023</download_date>
    <link_text>Link to the current ClinicalTrials.gov record.</link_text>
    <url>https://clinicaltrials.gov/ct2/show/NCT04448288</url>
  </required_header>
  <id_info>
    <org_study_id>RRC-2019-003</org_study_id>
    <nct_id>NCT04448288</nct_id>
  </id_info>
  <brief_title>Time-based Effects of Stretching on Hamstrings Muscle Strength</brief_title>
  <official_title>Time-based Effects of Stretching on Hamstrings Muscle Strength</official_title>
  <sponsors>
    <lead_sponsor>
      <agency>King Saud University</agency>
      <agency_class>Other</agency_class>
    </lead_sponsor>
  </sponsors>
  <source>King Saud University</source>
  <oversight_info>
    <has_dmc>Yes</has_dmc>
    <is_fda_regulated_drug>No</is_fda_regulated_drug>
    <is_fda_regulated_device>No</is_fda_regulated_device>
  </oversight_info>
  <brief_summary>
    <textblock>
      Stretching is reported to have detrimental effects on strength and thus avoided prior to&#xD;
      strength training session. Do stretching indeed decreases muscle strength? To examine the&#xD;
      time course (immediate, 10- and 20-min post stretching) for the effects of 2, 4, and 8 min&#xD;
      long duration of static-stretching (SS) on isometric maximum voluntary contraction (MVC)&#xD;
      force of hamstring muscles.&#xD;
    </textblock>
  </brief_summary>
  <detailed_description>
    <textblock>
      OBJECTIVE: To examine the time course (immediate, 10- and 20-min post stretching) for the&#xD;
      effects of 2, 4, and 8 min long duration of static-stretching (SS) on isometric maximum&#xD;
      voluntary contraction (MVC) force of hamstring muscles.&#xD;
&#xD;
      METHODS: Pretest-posttest experimental design. Total of 14 subjects with mean age 25 years&#xD;
      participated in three experimental trials on three different days. On day-I for&#xD;
      static-stretching for 2 minutes (SS2), day-II for 4 minutes (SS4), and day-III for 8 minutes&#xD;
      (SS8). Testing was conducted before (pre), immediately after (post), and at 10 and 20 min&#xD;
      post stretching. MVCF was measured using strain gauze as the main outcome measure.&#xD;
    </textblock>
  </detailed_description>
  <overall_status>Completed</overall_status>
  <start_date type="Actual">January 30, 2019</start_date>
  <completion_date type="Actual">April 15, 2019</completion_date>
  <primary_completion_date type="Actual">April 15, 2019</primary_completion_date>
  <phase>N/A</phase>
  <study_type>Interventional</study_type>
  <has_expanded_access>No</has_expanded_access>
  <study_design_info>
    <allocation>N/A</allocation>
    <intervention_model>Single Group Assignment</intervention_model>
    <primary_purpose>Other</primary_purpose>
    <masking>None (Open Label)</masking>
  </study_design_info>
  <primary_outcome>
    <measure>Change in Maximum voluntary contraction force (MVCF) before and after stretching</measure>
    <time_frame>MVCF was measured on 3 different days with each day separated by 3-4 days.</time_frame>
    <description>Change in Isometric strength (MVCF) was measured before and after stretching using strain gauge</description>
  </primary_outcome>
  <number_of_arms>1</number_of_arms>
  <enrollment type="Actual">14</enrollment>
  <condition>Stretch</condition>
  <arm_group>
    <arm_group_label>Hamstring Group</arm_group_label>
    <arm_group_type>Experimental</arm_group_type>
    <description>Pretest-posttest experimental design. Subjects participated in three experimental trials on three different days. On day-I for static-stretching for 2 minutes (SS2), day-II for 4 minutes (SS4), and day-III for 8 minutes (SS8). Testing was conducted before (pre), immediately after (post), and at 10 and 20 min post stretching. MVCF was measured using strain gauze as main outcome measure. The SS trials involved varied repetitions of 30-s static-stretches and 20-s relax period. MVC force was assessed.</description>
  </arm_group>
  <intervention>
    <intervention_type>Other</intervention_type>
    <intervention_name>Static stretching</intervention_name>
    <description>Static stretchings were performed by subjects that involved varied repetitions of 30-s static-stretches and 20-s relax period.</description>
    <arm_group_label>Hamstring Group</arm_group_label>
  </intervention>
  <eligibility>
    <criteria>
      <textblock>
        Inclusion Criteria:&#xD;
&#xD;
          -  Subjects used to engage in 1 to 5 hours of physical activity per week. They were not&#xD;
             doing stretching exercises regularly.&#xD;
&#xD;
        Exclusion Criteria:&#xD;
&#xD;
          -  Subjects having any current injury specific to lower limb joints or current&#xD;
             neuromuscular disease were excluded from the study.&#xD;
      </textblock>
    </criteria>
    <gender>All</gender>
    <minimum_age>24 Years</minimum_age>
    <maximum_age>30 Years</maximum_age>
    <healthy_volunteers>Accepts Healthy Volunteers</healthy_volunteers>
  </eligibility>
  <overall_official>
    <last_name>Masood Khan, MPTh</last_name>
    <role>Principal Investigator</role>
    <affiliation>Rehabilitation research chair</affiliation>
  </overall_official>
  <location>
    <facility>
      <name>King Saud University</name>
      <address>
        <city>Riyadh</city>
        <zip>11433</zip>
        <country>Saudi Arabia</country>
      </address>
    </facility>
  </location>
  <location_countries>
    <country>Saudi Arabia</country>
  </location_countries>
  <verification_date>June 2020</verification_date>
  <study_first_submitted>May 6, 2020</study_first_submitted>
  <study_first_submitted_qc>June 24, 2020</study_first_submitted_qc>
  <study_first_posted type="Actual">June 25, 2020</study_first_posted>
  <last_update_submitted>June 24, 2020</last_update_submitted>
  <last_update_submitted_qc>June 24, 2020</last_update_submitted_qc>
  <last_update_posted type="Actual">June 25, 2020</last_update_posted>
  <responsible_party>
    <responsible_party_type>Principal Investigator</responsible_party_type>
    <investigator_affiliation>King Saud University</investigator_affiliation>
    <investigator_full_name>Masood Khan</investigator_full_name>
    <investigator_title>Principal investigator</investigator_title>
  </responsible_party>
  <keyword>Stretching</keyword>
  <keyword>Muscle strength</keyword>
  <keyword>Hamstring Muscles</keyword>
  <!-- Results have not yet been posted for this study                                          -->
</clinical_study>


download date: ClinicalTrials.gov processed this data on September 20, 2023
link text: Link to the current ClinicalTrials.gov record.
url: https://clinicaltrials.gov/ct2/show/NCT04448288
org study id: RRC-2019-003
nct id: NCT04448288
lead sponsor: 
has dmc: Yes
is fda regulated drug: No
is fda regulated device: No
Stretching is reported to have detrimental effects on strength and thus avoided prior to
      strength training session. Do stretching indeed decreases muscle strength? To examine the
      time course (immediate, 10- and 20-min post stretching) for the effects of 2, 4, and 8 min
      long duration of static-stretching (SS) on isometric maximum voluntary contraction (MVC)
      force of hamstring muscles.
OBJECTIVE: To examine the time course (immediate, 10- and 20-min post stretching) for the
      effects of 2, 4, and 8 min long duration of static-stretching (SS) on isometric maximum
      voluntary contraction (MVC) force of hamstring muscles.

      METHODS: Pretest-posttest experimental design. Total of 14 subjects with mean age 25 years
      participated in three experimental trials on three different days. On day-I for
      static-stretching for 2 minutes (SS2), day-II for 4 minutes (SS4), and day-III for 8 minutes
      (SS8). Testing was conducted before (pre), immediately after (post), and at 10 and 20 min
      post stretching. MVCF was measured using strain gauze as the main outcome measure.
allocation: N/A
intervention model: Single Group Assignment
primary purpose: Other
masking: None (Open Label)
measure: Change in Maximum voluntary contraction force (MVCF) before and after stretching
time frame: MVCF was measured on 3 different days with each day separated by 3-4 days.
description: Change in Isometric strength (MVCF) was measured before and after stretching using strain gauge
arm group label: Hamstring Group
arm group type: Experimental
description: Pretest-posttest experimental design. Subjects participated in three experimental trials on three different days. On day-I for static-stretching for 2 minutes (SS2), day-II for 4 minutes (SS4), and day-III for 8 minutes (SS8). Testing was conducted before (pre), immediately after (post), and at 10 and 20 min post stretching. MVCF was measured using strain gauze as main outcome measure. The SS trials involved varied repetitions of 30-s static-stretches and 20-s relax period. MVC force was assessed.
intervention type: Other
intervention name: Static stretching
description: Static stretchings were performed by subjects that involved varied repetitions of 30-s static-stretches and 20-s relax period.
arm group label: Hamstring Group
criteria: 
gender: All
minimum age: 24 Years
maximum age: 30 Years
healthy volunteers: Accepts Healthy Volunteers
last name: Masood Khan, MPTh
role: Principal Investigator
affiliation: Rehabilitation research chair
facility: 
country: Saudi Arabia
responsible party type: Principal Investigator
investigator affiliation: King Saud University
investigator full name: Masood Khan
investigator title: Principal investigator