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Baseball batting is important to winning the games. Baseball batting is achieved by proximal-to-distal sequencing of body movements and controlled by the neuromuscular system. Poor lumbopelvic control could influence production and transfer of energy in the kinetic chain. This study aims to investigate the impact of lumbopelvic control in hitting mechanics and bat swing velocity in high school baseball players.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Stable group | Participants display knee valgus less or equal to 15° at 45° knee flexion in the descending phase of the squat on both legs |
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| Unstable group | Participants display knee valgus greater than 15° at 45° knee flexion in the descending phase of the squat on one leg or both legs |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| No intervention | Other | No intervention / Compare the difference in batting mechanics and bat-swing velocity in baseball players with good and poor lumbopelvic control |
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| Measure | Description | Time Frame |
|---|---|---|
| Ratio of angular displacement of lumbar spine and hip joint | Angular displacement of lumbar spine divided by angular displacement of hip joint | 1 week after enrolled |
| Bat-swing velocity | Maximal bat swing velocity during baseball batting | 1 week after enrolled |
| Ratio of angular displacement of thoracic spine and lumbar spine | Angular displacement of thoracic spine divided by angular displacement of lumbar spine | 1 week after enrolled |
| Timing of maximal angular velocity of hip joint | The time point where the hip joint reaches its maximal angular velocity over the batting phase | 1 week after enrolled |
| Timing of maximal angular velocity of lumbar joint | The time point where the lumbar joint reaches its maximal angular velocity over the batting phase | 1 week after enrolled |
| Timing of maximal angular velocity of thoracic joint | The time point where the thoracic joint reaches its maximal angular velocity over the batting phase | 1 week after enrolled |
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Inclusion Criteria:
Exclusion Criteria:
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College baseball batters in the area of Tainan City
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| National Cheng Kung University | Tainan | 701 | Taiwan |
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