![Scientific Review] Critical Swim Speed (CSS) Measurement and Aerobic Threshold Endurance Development: Latest Literature Analysis — Elite Athlete Physiological Characteristics Study (No. 1467)](/media/articles/images/article-11065-css—1467.png)

[Scientific Review] Critical Swim Speed (CSS) Measurement and Aerobic Threshold Endurance Development: Latest Literature Analysis — Elite Athlete Physiological Characteristics Study (No. 1467)

Reference Journal Source: Journal of Applied Biomechanics • International Scientific Research 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 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 sustainable cruising pace (generally defined as pace per 100 meters) a swimmer can maintain without excessive lactate accumulation. It serves as a 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, calculating the slope of time versus distance, which allows for the design of the most precise cruising interval training sets.

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 mechanics experiment analyzed the 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 shoulder deltoids.

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

Below is a 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, it is recommended to follow the following arrangements in actual training or equipment selection:

• 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.
• 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, swimmers should focus on engaging the EVF high-elbow catch technique, shifting the fulcrum of force to the latissimus dorsi to prevent rotator cuff strain.

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 pull generates a downward force component, causing significant fluctuation of the body’s waterline, increasing water resistance, and imposing great frictional stress on the shoulder 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.”

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