College of Kinesiology University of Saskatchewan
Saskatoon, Saskatchewan, S7K 2X2, Canada
Location status: Recruiting
Recruiting
NCT Number: NCT06944652
Stretching to Improve Jumping Performance
The study involves comparison of an 8-week plantar flexor stretching program to a shoulder stretching program for improving vertical jump performance in adolescent athletes.
Recruiting
Interested in participating?
Request InfoKey information
Conditions
Age range
12 year–17 year
Sex eligibility
All sexes
Study type
Interventional
Phase
Not applicable
Primary location
About this study
Increasing flexibility may improve vertical jump performance. For example, being able to go deeper into a squat before jumping may allow for greater force development through the range of movement and this may transfer to greater vertical jump height. The study compares plantar flexor stretching to shoulder stretching for improving vertical jump performance in adolescent athletes. Athletes are being stratified by sex and maturity status (before or after estimated age at peak height velocity) and randomized to one of two groups: Plantar flexor stretching (2 sets of 6 stretches, 5 times per week) or the same volume of shoulder stretching. Before and after training, participants are being assessed for vertical jump and landing performance.
Who can participate
Healthy volunteers accepted: Yes
Only the study team can determine whether someone qualifies for participation.
Inclusion criteria
- Currently involved in a sport training program
Exclusion criteria
- Current or past injuries that might affect jumping performance or stretching the plantar flexors or shoulder joint
Treatment and study plan
Stretching
OtherStretching of the plantar flexors or the shoulder joint
Primary outcomes
-
Counter movement jump height
Time frame: Change over 8 weeks
Counter movement jump height assessed on a force plate
Secondary outcomes
-
Take-off velocity
Time frame: Change over 8 weeks
Take-off velocity assessed on a force plate in the right and left limbs
-
Ground reaction force on take off
Time frame: Change over 8 weeks
Ground reaction force on take off from a counter movement jump on a force plate in right and left limbs
-
Ground reaction force on landing
Time frame: Change over 8 weeks
Ground reaction force when landing from a jumping on force plate in right and left limbs
-
Ground reaction force when landing from a standard height
Time frame: Change over 8 weeks
Ground reaction force when landing from a height (150% of baseline counter movement jump height)
-
Functional dorsiflexor range of movement
Time frame: Change over 8 weeks
Functional dorsiflexor range of movement assessed with an inclinometer in left and right limbs
-
Active dorsiflexor range of movement
Time frame: Change over 8 weeks
Active dorsiflexor range of movement assessed with a goniometer in right and left limbs
-
Passive dorsiflexor range of movement
Time frame: Change over 8 weeks
Passive dorsiflexor range of movement assessed with a goniometer in right and left limbs
-
Shoulder flexibility
Time frame: Change over 8 weeks
Shoulder flexibility assessed with a goniometer in right and left limbs
Study contacts
Contact information is provided by the study sponsor or research team.
Sponsors and collaborators
Lead sponsor
University of Saskatchewan
Other
Registry information
Official study title
Flexibility Training (Stretching) to Improve Jumping Performance
Important dates
- Study start
- 2025
- Primary completion
- 2026
- Study completion
- 2026
- First posted
- Apr 25, 2025
- Registry last updated
- Feb 23, 2026
OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.
View the official ClinicalTrials.gov record (opens in a new tab)This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.
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