Transient cardiac dysfunction but elevated cardiac and kidney biomarkers 24 h following an ultra-distance running event in Mexican Tarahumara

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

ISSN: 2046-7648