Energy flows with intentional changes in leg movements during baseball pitching.

Area of Science:

• Sports Biomechanics
• Baseball Pitching Analysis
• Human Movement Science

Background:

• High ball velocity is crucial for baseball pitchers.
• Lower extremity movements are believed to drive energy transfer for velocity.
• Previous research has not investigated intentional changes in lower extremity movements on energy flow.

Purpose of the Study:

• To examine how altering stride length affects energy flow from lower extremities to the trunk in baseball pitchers.
• To determine if changes in stride length influence the mechanical energy transferred during pitching.

Main Methods:

• Twenty male college baseball pitchers participated.
• Pitching trials were conducted with normal (NS), under-stride (US), and over-stride (OS) lengths (±20% of NS).
• Analysis focused on positive and negative work at the pivot hip, stride hip, and trunk joints to assess energy flow.

Main Results:

• Energy inflow from the pivot hip and outflow to the stride hip varied with stride length.
• Total energy outflow from the lower torso to the trunk joint during key phases was not significantly affected by stride length.
• Ball velocity showed no significant difference between under-stride and over-stride conditions.

Conclusions:

• Altering stride length in baseball pitching does not significantly alter total energy outflow to the trunk.
• Ball velocity may not be solely explained by lower extremity mechanics and stride length variations.
• Further research is needed to understand the complex interplay of factors influencing pitching velocity.