[Research Review] Quantitative Biomechanical Analysis of High Elbow Position (EVF) and Latissimus Dorsi Torque During the Swimming Catch Phase (Article 1320)

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

In the swimming section of sports science, the latest biomechanical analyses and nutritional research have revealed more subtle physiological insights. 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 both the experimental and control groups. The findings are not only highly valuable for professional coaches but also provide a scientific basis for age-group athletes pursuing their personal best PB.

Definition of Critical Swim Speed (CSS) in Scientific Training

Critical Swim Speed (CSS) refers to the maximum sustainable cruising pace a swimmer can maintain without excessive lactate accumulation (generally defined as the pace per 100 meters). It serves as the benchmark for scientific swim 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, which allows for the design of the most precise cruise interval workouts.

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

Early Vertical Forearm (EVF) is the most propulsive-efficient catch technique in modern freestyle. This mechanical experiment analyzed the projected surface area of the swimmer’s arm and shoulder joint torque during the underwater pull phase. The results found that EVF allows swimmers to position the forearm and hand perpendicular to the direction of water flow during 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, substantially reducing the load on the deltoid muscles of the shoulder.

Comparative Table of Mechanical Efficiency Between EVF and Straight-Arm Pull

Below is the compiled experimental control group comparison with multi-dimensional data:

Core Research Conclusions and Practical Recommendations

Based on the experimental conclusions of this paper, the following arrangements are recommended for actual training or equipment selection:

• Gastrointestinal Adaptation: During long-distance aerobic training, carbohydrate intake per hour should follow the golden ratio of 2:1 glucose to fructose for fueling adaptation.
• Equipment Performance Adaptation: When using carbon-fiber stiff-soled shoes or deep-section wheels, gradually increase weekly mileage to allow sufficient adaptation time for the Achilles tendon and joints.
• 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 overuse injuries.

Common Research 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 pull generates a downward force component, causing significant fluctuation of the body’s waterline that increases drag, and places extreme frictional stress on the rotator cuff joint capsule, which can easily lead 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.”

Further Reading

• Research Review: Quantitative Biomechanical Analysis of High Elbow Position (EVF) and Latissimus Dorsi Torque During the Swimming Catch Phase (Article 1353)
• Research Review: Quantitative Biomechanical Analysis of High Elbow Position (EVF) and Latissimus Dorsi Torque During the Swimming Catch Phase (Article 303)
• Research Review: Quantitative Biomechanical Analysis of High Elbow Position (EVF) and Latissimus Dorsi Torque During the Swimming Catch Phase (Article 1071)
• Research Review: Quantitative Biomechanical Analysis of High Elbow Position (EVF) and Latissimus Dorsi Torque During the Swimming Catch Phase (Article 1110)