Table 2.
Estimated VO2max, heart rate measures, absolute and relative intensities of 63-km running, and history of running competition in Tarahumara athletes (n = 10) presented as mean (SD)
| Variable | Mean | SD | Range |
|---|---|---|---|
| Sleeping heart rate (bts min−1) | 51 | 3 | 47–58 |
| Estimated maximal heart rate (bts min−1)a | 187 | 4 | 177–193 |
| Estimated VO2max (mlO2 min−1 kg−1) | 54.5 | 8.8 | 40.9–70.1 |
| Race time (min) | 418.3 | 42.5 | 351–485 |
| Absolute intensity (km h−1) | 9.1 | 0.9 | 7.8–10.8 |
| Net heart rate during race (bts min−1)b | 103 | 8.0 | 90–116 |
| Physiological intensity (J min−1 kg−1)c | 746 | 143 | 500–1002 |
| Relative intensity (%) | 72 | 6 | 61–79 |
| Running competitions (n)* | 8 | 0–25 |
* Number of running competitions within last year with distance/time ranging from 42 to 63 km to 24-h traditional kick-ball race estimated at 150–200 km (based on answers from 8 participants). One participant reported having experienced hematuria
aEstimated maximal heart rate according to Tanaka equation
bNet heart rate is heart rate above sleeping level
cActivity intensity during race without resting energy expenditure