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The study will be looking at acute changes in Achilles tendon properties and changes in a vertical single leg hop following an exercise intervention. The three exercise interventions will be randomized and take place on separate days 1 week apart. The three exercise interventions are AAROM, slow load, and plyometrics.
The purpose of the study is to determine if there are acute changes in Achilles tendon properties and changes in performance based on what tendon exercise intervention is being used. About 70 people will take part in this research.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Group 1 | Experimental | Randomized AAROM, Slow Load, or Plyometric intervention |
|
| Group 2 | Experimental | Randomized AAROM, Slow Load, or Plyometric intervention |
|
| Group 3 | Experimental | Randomized AAROM, Slow Load, or Plyometric intervention |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| AAROM | Other | AAROM with knee to wall exercise, 3x30 reps |
|
| Measure | Description | Time Frame |
|---|---|---|
| Achilles Tendon Stiffness | A myotonometer will measure the stiffness in N/m. | immediately |
| Achilles Tendon Natural Oscillation | A myotonometer will measure the natural oscillation frequency in Hz. | immediately |
| Achilles Tendon Logarithmic Decrement | A myotonometer will measure logarithmic decrement, which is a measure of elasticity. | immediately |
| Achilles Tendon Mechanical Stress Relaxation Time | A myotonometer will measure mechanical stress relaxation time in ms. | immediately |
| Achilles Tendon Creep | A myotonometer will measure creep in De. | immediately |
| Measure | Description | Time Frame |
|---|---|---|
| Single-leg drop jump vertical | Single-leg vertical drop jump from 4-inch box with knee locked in extension will be measured in cm. A higher jump is considered better. | immediately |
| Reactive Strength Index |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Sanford Coyote Sport Center | Vermillion | South Dakota | 57069 | United States |
Data will be available upon request
If required with the publication, a link to de-identified data will be provided.
IPD will be available upon request
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| ID | Term |
|---|---|
| D013708 | Tendon Injuries |
| ID | Term |
|---|---|
| D014947 | Wounds and Injuries |
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| ID | Term |
|---|---|
| D059385 | Plyometric Exercise |
| ID | Term |
|---|---|
| D005081 | Exercise Therapy |
| D012046 | Rehabilitation |
| D000359 | Aftercare |
| D003266 | Continuity of Patient Care |
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The researchers collecting data will be blinded to the intervention provided
| Slow Load | Other | Single leg heel raise, 3x10 reps |
|
| Plyometric | Other | Double leg 5 inch wall hops, 3x10 sec |
|
Reactive Strength Index will be measured as an AU, the higher the better.
| immediately |
| Flight Time | Flight time will be measured in ms, the higher the better. | immediately |
| Contact Time | Contact time will be measured in ms, the lower the better. | immediately |
| Limb Stiffness | Limb stiffness will be measured in kN/m, generally the higher the better. | immediately |
| D005791 |
| Patient Care |
| D013812 | Therapeutics |
| D026741 | Physical Therapy Modalities |
| D064797 | Physical Conditioning, Human |
| D015444 | Exercise |
| D009043 | Motor Activity |
| D009068 | Movement |
| D009142 | Musculoskeletal Physiological Phenomena |
| D055687 | Musculoskeletal and Neural Physiological Phenomena |