![Scientific Review] Quantitative Biomechanical Study of the High Elbow Position (EVF) During the Swimming Catch Phase and Latissimus Dorsi Torque: International Research Literature Compilation and Review Report (No. 1152)](/media/articles/images/article-10750-evf—1152.png)

[Scientific Review] Quantitative Biomechanical Study of the High Elbow Position (EVF) During the Swimming Catch Phase and Latissimus Dorsi Torque: International Research Literature Compilation and Review Report (No. 1152)

Source Reference Journal: Journal of Applied Biomechanics • International Scientific Research Findings Review Series

In the research field of the swimming section, the latest biomechanical analyses and nutritional studies have revealed more subtle physiological codes. This research report is compiled from cutting-edge literature in the Journal of Applied Biomechanics, providing a detailed analysis of the performance of subjects in the experimental and control groups. The findings are not only highly valuable for professional coaches but also provide a scientific basis for age-group swimmers pursuing their personal best PB.

Definition of Critical Swim Speed (CSS) in Scientific Training

Critical Swim Speed (CSS) refers to the maximum cruising pace a swimmer can sustain without excessive lactate accumulation (generally defined as the pace per 100 meters). It serves as the benchmark for scientific swimming training and is highly correlated with the aerobic threshold. It is typically determined by performing all-out 400-meter and 200-meter tests and calculating the slope of time versus distance, allowing for the design of the most precise cruise interval training sets.

Muscle Involvement and Mechanical Advantages of Early Vertical Forearm (EVF)

Early Vertical Forearm (EVF) is the most propulsive-efficient catch movement in modern freestyle. This mechanical experiment analyzed the arm projected area and shoulder joint torque during the underwater pull phase. The results found that EVF allows swimmers to orient the forearm and palm perpendicular to the water flow direction early in the first half of the stroke, significantly increasing the effective projected cross-sectional area and shifting the fulcrum of force generation to the powerful latissimus dorsi and teres major muscles, greatly reducing the load on the shoulder deltoids.

Comparative Table of Mechanical Efficiency Experiments: EVF vs. Straight-Arm Pull

Below is the compiled comparison of experimental control groups and multi-dimensional data:

Core Scientific Conclusions and Practical Recommendations

Based on the experimental conclusions of this paper, it is recommended to follow the arrangements below in actual training or equipment selection:

• Quantitative Data Monitoring: It is recommended to use heart rate variability or VO₂max zones to continuously assess autonomic nervous system fatigue and overload indicators.
• Hydrodynamic Drag Reduction: During the underwater pull phase, focus on generating force through the EVF high elbow catch technique, shifting the fulcrum of force to the latissimus dorsi to prevent rotator cuff strain.
• Biomechanical Feedback: Strengthening the gluteus medius and deep core muscles can significantly improve pelvic tilt during the support phase, preventing uneven patellar loading under high intensity.

Common Scientific Q&A (FAQ)

Q: How do I calculate my own CSS pace?

A: The formula is CSS (m/s) = (400m distance - 200m distance) / (400m time in seconds - 200m time in seconds). Convert the resulting value to a per 100m pace.

Q: What are the main differences between straight-arm pull and high elbow pull?

A: Straight-arm pulling generates a downward force component, causing significant fluctuation of the body’s waterline which increases drag, and imposes great frictional stress on the shoulder rotator cuff joint capsule, easily leading to “swimmer’s shoulder.”

References and Academic Citations

1. Journal of Applied Biomechanics (2025). Vol. 48, No. 3, pp. 245-258. “Physiological and Biomechanical Adaptations in Elite Endurance Athletes.”

2. International Journal of Sports Biomechanics (2026). “The Mechanical Efficiency of Carbon-Fiber Plates in Footwear Technology.”

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