Accuracy of estimates of cumulative load during a confined activity: bicycling

Figures & data

Table 1. Description of powers and cadences performed by participants in Groups 1 and 2. This table shows the three conditions for relative power and cadence (self-selected moderate, +10% and -10% of self-selected)

Group		1^st Bout	2^nd Bout	3^rd Bout
1	Power (W)	100	100	100
	Cadence (RPM)	Self-selected	+10%	−10%
2	Power (W)	Self-selected	+10%	−10%
	Cadence (RPM)	80	80	80

Figure 1. Representative force data from the first 500 revolutions of a single bicycling bout were extracted for one participant. Each of the 500 revolutions was time-normalized (0–100), and the mean (solid line) and 95% confidence interval (dashed line) of the time-normalized pedal reactions forces for the PRF_N (A) and PRF_AP (B) are plotted

Table 2. Mean and standard deviation of measured cumulative reaction forces (total impulse) for the PRF_N, PRF_AP, and PRF_R groups, and both groups combined. There were no statistically significant differences in measured cumulative load between the groups, for any of the three reaction forces (p > 0.35)

Force Direction	Mean Cumulative Load by Group
	Group 1 Constant Power	Group 2 Constant Cadence	Both Groups Combined
PRFN	41,951.56 (9008.9) Ns	40,506.3 (10,782.4) Ns	41,228.9 (9891.9) Ns
PRFAP	13,757.6 (4453.2) Ns	15,170.1 (8001.89) Ns	14,463.8 (6468.8) Ns
PRFR	45,966.9 (10,500.5) Ns	43,836.5 (9279.5) Ns	44,901.72 (9897.1) Ns

Figure 2. R² (A), slope (B), and normalized RMSE (C) for the following estimates of cumulative load: ePRF_N (solid red), ePRF_AP (dotted blue), and ePRF_R (dashed green) produced using each individual percent of the collected data

Figure 3. Normalized RMSE (A), R² (B), and slope (C) for estimates of cumulative load produced using between 1% and 99% of the whole activity for PRF_AP (dashed blue), and between 1% and 98% of the whole activity for PRF_N (solid red) and PRF_R (dashed green)