Running & Endurance Splits
Running Pace, Splits & Race Time Predictor
Calculate pace intervals, metric/imperial velocity, and project 5K, 10K, Half, and Marathon finish times.
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About This Calculation
The Riegel Endurance Power Law
Peter Riegel established that athletic speed diminishes at a predictable exponential rate as duration increases: = T_1 imes (D_2 / D_1)^{1.06}$. This 1.06 fatigue exponent models the gradual depletion of muscle glycogen and shift toward less efficient lipid oxidation.
Limitations & Context
Projections assume the athlete possesses aerobic volume commensurate with the target event distance. Projecting a marathon from a 5K without sufficient weekly long runs will overestimate performance.
Scientific References:
Riegel, P. S. (1981). Athletic records and human endurance. American Scientist, 69(3), 285-290.
Analysis Output
Computed Performance Result
Awaiting Calculation
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Important Disclaimer:
Race predictions are theoretical performance benchmarks under optimal course and weather conditions.
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September 11, 2026 &b000000FridayFriday; 08:11 AM
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Testing Instrument
Running Pace, Splits & Race Time Predictor
Methodology
riegel_endurance
Measurement Standard
metric Standard
Primary Performance Output
—
Evaluation Parameters & Baseline Inputs
| Benchmark Distance | 5000 |
| Hours | 0 |
| Minutes | 24 |
| Seconds | 30 |
Methodological Notes & Laboratory Disclaimer:
Calculations are derived from peer-reviewed exercise science models. Neuromuscular fatigue, movement velocity, and technical proficiency influence real-time execution. Race predictions are theoretical performance benchmarks under optimal course and weather conditions.
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