Fatigue and efficiency of high-intensity cycling


We are interested in exploring how fatigue relates to the energy cost of cycling exercise. Minimizing the energy cost of cycling may be a key determinant of cycling performance, and we want to explore how and why this energy cost may change with fatigue. Participants will be required to report to the laboratory for up to 13 total visits, each lasting approximately 60-120 minutes. Participants will first perform an incremental test to determine their maximal oxygen uptake, and then a series of three tests to determine their critical power (this should be an intensity that can be sustained for about one hour). Following these tests, participants will perform several constant load trials at varying work rates while monitoring ventilation, oxygen uptake and any changes in fatigue. Some of these trials will be to the limit of endurance.


Currently recruiting participants: Yes

Eligible gender: Male, Female, Transgender, Other

Eligible ages: 20 to 40

Accepts healthy participants: Yes

Inclusion criteria:

Trained males and females who:

1) Are between 20 and 40 years of age
2) Have trained an average of 3 days per week for the previous two years
3) Have not had any major injuries in the previous 6 months


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Method of contact

Additional information

Contact information

Keenan MacDougall PhD Student University of Calgary Faculty of Kinesiology

Principal investigator:

Brian MacIntosh

Clinical trial: