Research On The Pedaling Frequency And Riding Comfort Of Cycling Road Speed Bicycles At Critical Power

Objective: To explore the optimum pedalling frequency at critical power.Based on different flywheel combinations at critical power to investigate the comfort of riding at different pedalling frequencies and improving the aerobic riding efficiency of the cyclist.To investigate the comfortable pedalling frequency based on critical power to find a comfortable frequency for maintaining a high aerobic power output.Research method: Critical power test: The power used for each test is randomly selected.Then the subject can familiarize themselves with the test power in advance and then begin the test with four different powers.The exercise duration and the actual average output power are used to calculate the critical power for each subject.Comfort pedalling frequency test: Based on the resulting critical power,subjects performed 60 revolutions per minute,75 revolutions per minute,90 revolutions per minute,and free frequency on a road bike by adjusting different flywheel ratios at critical power,ordered as 60 rpm,75 rpm,90 rpm and free frequency at critical power.After riding the comfort questionnaire was issued,and the changes in physiological and biochemical data during the exercise were recorded.Research results: 1.After an aerobic exercise in four groups at different pedaling frequencies based on critical power,immediate systolic blood pressure,respiratory rate,ventilation,hematocrit,and hemoglobin produced significant differences between groups,with a significant increase in 90 revolutions per minute compared to75 revolutions per minute and 60 revolutions per minute(p<0.05).2.75 revolutions per minute had a higher comfortable score than 60 revolutions per minute and 90 revolutions per minute for aerobic exercise at different pedaling frequencies.3.In the four groups of aerobic exercise with different pedaling frequencies,there were some differences in comfort levels between the groups.Those different items are mainly in the arms,lower pubic area,buttocks,and legs.As 75 revolutions per minute have a significantly higher comfort level score than 90 revolutions(P < 0.05),followed by75 revolutions in the lower pubic area and legs(P < 0.05).The comfort scores were significantly higher for 75 than for 60(P<0.05),followed by 75 in the lower pubic area and legs(P<0.05).Discussion: 1.95 revolutions per minute is a stronger stimulus to the body’s sympathetic nerves than 75 revolutions,60 revolutions,and free pedaling.Which is resulted in increasing sweating,peripheral vascular resistance,and increased oxygen demand.2.Compared to the 90 revolutions per minute to 75 revolutions per minute and 60 revolutions per minute,a decreased in the body’s core stability and weakened control of the bike will happen.It also can generate the peak pedaling force to occur earlier which is affecting the power of the ride.Conclusions: 1.Riding at 66-75 revolutions per minute is more comfortable and acceptable based on critical power.2.90 revolutions per minute at critical power causes an increase in systolic blood pressure,respiratory rate,and ventilation compared to other pedaling frequencies.At 90 revolutions per minute,there is an increase in hemoglobin and haematocrit compared to other stirring frequencies.3.75 revolutions per minute at critical power is more comfortable overall than 60 and 90 revolutions.The 75 revolutions per minute had higher comfort levels in the arms,lower pubic area,buttocks,and legs than the 90 revolutions.It also has a higher comfort level in the legs than the 60 revolutions.