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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.
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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Plantar flexor stretching | Experimental | Flexibility training (stretching) of the muscles at the back of the lower leg |
|
| Shoulder stretching | Active Comparator | Flexibility training (stretching) of the muscles surrounding the shoulder joint |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Stretching | Other | Stretching of the plantar flexors or the shoulder joint |
|
| Measure | Description | Time Frame |
|---|---|---|
| Counter movement jump height | Counter movement jump height assessed on a force plate | Change over 8 weeks |
| Measure | Description | Time Frame |
|---|---|---|
| Take-off velocity | Take-off velocity assessed on a force plate in the right and left limbs | Change over 8 weeks |
| Ground reaction force on take off | Ground reaction force on take off from a counter movement jump on a force plate in right and left limbs |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Philip Chilibeck, PhD | Contact | 306-966-1072 | phil.chilibeck@usask.ca |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| College of Kinesiology University of Saskatchewan | Recruiting | Saskatoon | Saskatchewan | S7K 2X2 | Canada |
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Participants are being masked as to the study hypothesis
| Change over 8 weeks |
| Ground reaction force on landing | Ground reaction force when landing from a jumping on force plate in right and left limbs | Change over 8 weeks |
| Ground reaction force when landing from a standard height | Ground reaction force when landing from a height (150% of baseline counter movement jump height) | Change over 8 weeks |
| Functional dorsiflexor range of movement | Functional dorsiflexor range of movement assessed with an inclinometer in left and right limbs | Change over 8 weeks |
| Active dorsiflexor range of movement | Active dorsiflexor range of movement assessed with a goniometer in right and left limbs | Change over 8 weeks |
| Passive dorsiflexor range of movement | Passive dorsiflexor range of movement assessed with a goniometer in right and left limbs | Change over 8 weeks |
| Shoulder flexibility | Shoulder flexibility assessed with a goniometer in right and left limbs | Change over 8 weeks |