【Research Review】Quantitative Biomechanical Analysis of High Elbow Position (EVF) and Latissimus Dorsi Torque During the Swimming Catch Phase — Biomechanical Quantification Experiment Report (No. 303)

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

In the swimming section of the research field, the latest biomechanical analyses and nutritional studies have revealed more subtle physiological codes. This research report is compiled from the cutting-edge literature of 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 athletes 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 through all-out 400-meter and 200-meter tests, calculating the slope between time and distance, which allows for the design of the most precise cruise interval training sets.

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

Early Vertical Forearm (EVF) is the most propulsion-efficient catch technique in modern freestyle swimming. This mechanical experiment analyzed the swimmers’ arm projected area and shoulder joint torque during the underwater pull phase. The results found that EVF allows swimmers to position the forearm and palm perpendicular to the water flow direction 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 deltoid muscles of the shoulder.

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

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

Core Scientific Conclusions and Practical Recommendations

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

• Quantitative Data Monitoring: It is recommended to use heart rate variability or maximal oxygen uptake zones to continuously assess autonomic nervous system fatigue and overload indicators.
• 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.
• Hydrodynamic Drag Reduction: During the underwater pull phase, swimmers should focus on engaging the EVF high elbow catch technique, shifting the fulcrum of force to the latissimus dorsi to prevent rotator cuff overuse injuries.
• Equipment Efficacy Adaptation: When using carbon-fiber stiff plates or deep-section wheels, weekly mileage should be gradually increased to allow the Achilles tendon and joints sufficient adaptation time.

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: The straight-arm pull generates a downward force component, causing severe fluctuations in the body’s waterline that increase drag, and creates significant frictional stress on the 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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