Table 1.
Heart rate response, lactate accumulation, rate of perceived exertion, and average running pace during 2 high-intensity training protocols (mean ± SD).
| Variable | 10 × 400 m | 40 × 100 m | p |
|---|---|---|---|
| HRpeak (bpm) | 179.00 ± 9.07 | 176.25 ± 9.64 | 0.067 |
| HRmean (bpm) | 144.12 ± 14.29 | 160.60 ± 12.64 | <0.001 |
| ΔHRrec (bpm) | 31.00 ± 14.09 | 22.88 ± 14.23 | 0.091 |
| BLa (mmol/L) | 12.87 ± 3.21 | 12.40 ± 4.14 | 0.670 |
| RPE (6–20) | 16.00 ± 1.24 | 15.11 ± 1.13 | 0.019 |
| Running pace (km/h) | 18.47 ± 1.51a | 21.60 ± 1.72a | <0.001 |
| vVO2max (%) | 107.17 ± 2.83 | 125.40 ± 4.89 | <0.001 |
Abbreviations: ΔHRrec = heart rate recovery in the last run minus that in the first; BLa = blood lactate accumulation; HRmean = mean heart rate; HRpeak = peak heart rate; RPE (6–20) = rate of perceived exertion on a 6–20 Borg scale; vVO2max = velocity associated with maximal oxygen uptake.
a
No significant differences within running protocols, constant speed. Notes: 10 × 400 m: 10 runs of 400 m with 90–120 s of recovery between running bouts; 40 × 100 m: 40 runs of 100 m with 25–30 s of recovery between running bouts.