Performance at high pedaling cadences in well-trained cyclists

Area of Science:

• Exercise Physiology
• Sports Science
• Cycling Performance

Background:

• Understanding the relationship between pedaling cadence and maximal cycling power output (W(max)) is crucial for optimizing athletic performance.
• Previous research has explored various factors influencing W(max), but the specific impact of high cadences requires further investigation.

Purpose of the Study:

• To determine the effect of high pedaling cadences (80, 100, and 120 rpm) on maximal cycling power output (W(max)) in well-trained cyclists.
• To assess the influence of high cadences on physiological markers such as the ventilatory anaerobic threshold (VT(2)), blood lactate, and blood pH.

Main Methods:

• Nine well-trained cyclists underwent continuous, incremental cycle-ergometer tests to exhaustion.
• Tests were performed at three different pedaling cadences: 80, 100, and 120 revolutions per minute (rpm).
• Physiological responses including W(max), VT(2), expired CO(2), blood lactate concentration ([Lac]), and blood pH were measured.

Main Results:

• Maximal cycling power output (W(max)) was approximately 9% lower at 120 rpm compared to 80 and 100 rpm (P < 0.05).
• The power output at the ventilatory anaerobic threshold (VT(2)) was reduced by 11% at 120 rpm (P < 0.05).
• While blood lactate increased and bicarbonate decreased at 120 rpm, blood pH remained stable, and gross efficiency did not differ across cadences.

Conclusions:

• High pedaling cadences (120 rpm) negatively impact maximal cycling performance and the anaerobic threshold in trained cyclists.
• The ventilatory anaerobic threshold (VT(2)) appears to be a more sensitive indicator of optimal pedaling cadence for performance than blood pH or efficiency.
• These findings suggest that cyclists should consider their VT(2) when selecting a pedaling cadence for maximal effort.