Reliability of a high-intensity cycling capacity test

Area of Science:

• Exercise Physiology
• Sports Science
• Human Performance

Background:

• High-intensity exercise protocols are crucial for assessing physiological responses.
• The reliability of such tests is paramount for accurate data interpretation and intervention studies.
• Understanding exercise capacity and associated metabolic markers informs training and nutritional strategies.

Purpose of the Study:

• To evaluate the test-retest reliability of the CCT110% (cycling capacity test at 110% of maximal aerobic power).
• To assess the consistency of performance metrics like time to exhaustion (TTE) and total work done (TWD).
• To examine the reliability of blood pH and metabolite measurements during this high-intensity protocol.

Main Methods:

• Twenty-seven recreationally active participants completed the CCT110% protocol on two separate occasions.
• Key performance indicators (TTE, TWD) and blood markers (pH, lactate, bicarbonate, base excess) were recorded.
• Statistical analyses included intra-class correlations (ICC), coefficient of variation (CV), and repeated measures ANOVA.

Main Results:

• No significant differences were found in TTE or TWD between the two trials (P > 0.05).
• High ICC values (r=0.88 for TTE, r=0.94 for TWD) and low CVs (4.43% for TTE, 4.94% for TWD) indicate strong reliability.
• Blood pH showed a minor, statistically significant difference immediately post-exercise between trials, but other blood markers were consistent.

Conclusions:

• The CCT110% is a reliable exercise protocol for assessing cycling capacity and associated physiological responses.
• Its reliability supports its use in nutritional intervention studies aimed at modulating exercise-induced pH changes.
• The protocol provides consistent performance data, making it valuable for research in exercise physiology and sports nutrition.