Inertial Measurement Unit Based Hip Flexion Strength-Power Test for Sprinters

Area of Science:

• Sports Science
• Biomechanics
• Human Movement Analysis

Background:

• Sprint performance relies on complex biomechanical factors, including hip flexion strength and power.
• Accurate and accessible methods for assessing these factors are crucial for athlete development.

Purpose of the Study:

• To evaluate an inertial measurement unit (IMU)-based hip flexion strength-power test as a predictor of sprint performance.
• To determine the relationship between IMU-measured hip flexion variables and sprint metrics like speed, step length, and step frequency.

Main Methods:

• Sixteen male sprinters completed 60-m sprints and an IMU-based hip flexion strength-power test with varying ankle weights (0, 0.75, 1.5 kg).
• Sprint performance, step length (SL), and step frequency (SF) were recorded using a force platform system.
• IMU data from the thigh captured hip flexion strength-power variables.

Main Results:

• Positive work and mean power of right hip flexion, particularly with 1.5 kg ankle weight, showed significant positive correlations with running speed.
• These hip flexion metrics also correlated positively with step frequency (SF) during later acceleration phases.
• Specific correlations were observed between hip flexion positive work and running speed (r=0.588-0.761) and SF (r=0.526).
• Hip flexion positive mean power correlated with running speed (r=0.547-0.638) and SF (r=0.501-0.553).

Conclusions:

• The IMU-based hip flexion strength-power test, especially with weighted conditions, serves as a valid indicator of sprint performance in well-trained male sprinters.
• Improved hip flexion strength and power contribute to enhanced step frequency and overall sprint speed, particularly in the acceleration phase.