Time-based Effects of Stretching on Hamstrings Muscle Strength

Not Applicable

Completed

• Conditions: Stretch
• Interventions: Other: Static stretching

• Registration Number: NCT04448288
• Lead Sponsor: King Saud University

Brief Summary

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.

Detailed Description

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.

Study Timeline

• Study Start: 2019-01-30
• Primary Completion: 2019-04-15
• Study Completion: 2019-04-15
• Study First Submitted: 2020-05-06
• Status Verified: 2020-06
• Study First Submitted QC: 2020-06-24
• Last Update Submitted: 2020-06-24
• Study First Posted: 2020-06-25
• Last Update Posted: 2020-06-25

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 14

Inclusion Criteria

• Subjects used to engage in 1 to 5 hours of physical activity per week. They were not doing stretching exercises regularly.

Exclusion Criteria

• Subjects having any current injury specific to lower limb joints or current neuromuscular disease were excluded from the study.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Hamstring Group	Static stretching	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.

Primary Outcome Measures

Name	Time	Method
Change in Maximum voluntary contraction force (MVCF) before and after stretching	MVCF was measured on 3 different days with each day separated by 3-4 days.	Change in Isometric strength (MVCF) was measured before and after stretching using strain gauge

Trial Locations

Locations (1)

King Saud University; 🇸🇦 Riyadh, Saudi Arabia