TABLE 1.
Study population characteristics and its monitoring devices.
| Horse number | Sex | Age (y) | Breed | Body mass (kg) | Total mass incl rider | Coat color | Distance (km) | Horse experience (years) | Age start (years) | GI Pill Y/N | GPS/HR Y/N | BOM (°C; Ta), min – max | PCV (Hct), lactate, TS, pH Y/N | Blood gas Y/N | Biochemistry (electrolytes, glucose) Y/N | Hematology |
| 1 | G | 11 | Arab | 669 | 752 | Gr | 80 | 6 | 4 | Y | Y | 13−26 | Y | Y | Y | N |
| 2 | G | 9 | Arab | 484 | 587 | B | 80 | 2 | 7 | Y | Y | 13−26 | Y | Y | Y | N |
| 3 | M | 13 | Arab | 426 | 489 | C | 80 | 3 | 10 | Y | Y | 6−19 | Y | Y | Y | N |
| 4 | M | 7 | QH × TB | 470 | 573 | C | 100 | 1 | 6 | Y | Y | 6−19 | Y | Y | Y | N |
| 5 | M | 11 | Arab | 450 | 533 | C | 80 | 2 | 9 | Y | Y | 6−19 | Y | Y | Y | N |
| 6 | M | 8 | Arab | 370 | 453 | Gr | 100 | 4 | 4 | Y | Y | 6−19 | Y | Y | Y | N |
| 7 | M | 9 | Arab | 450 | 523 | C | 80 | 2 | 7 | Y | N^ | 3−22 | Y | N | Y** | Y |
| 8 | G | 11 | Arab | 470 | 553 | Gr | 80 | 1 | 9 | Y | Y | 3−22 | Y | N | Y** | Y |
| 9 | G | 7 | QH | 490 | 573 | C | 80 | 1 | 6 | N | Y | 7−13 | Y | Y | Y | N |
| 10 | G | 10 | Arab × TB | 484 | 587 | C | 80 | 5 | 5 | N | Y | 7−13 | Y | Y | Y | N |
| 11 | G | 5 | Arab | 458 | 541 | B | 40 | 0 | 5 | N | Y | 7−13 | Y | Y | Y | N |
| 12 | G | 7 | Arab | 525 | 608 | B | 80 | NK | NK | N | Y | 3−22 | Y | N | Y** | Y |
| 13 | M | 15 | Arab | 480 | 563 | Gr | 40 | NK | NK | N | N^^ | 3−22 | Y | N | Y** | Y |
| 14 | G | 10 | SB | 484 | − | B | 1.54 | − | − | Y | Y | 5−13 | Y | N | N | N |
| 15 | G | 5 | SB | 610 | − | B | 1.54 | − | − | Y | Y | 5−13 | Y | N | N | N |
| 16 | G | 17 | SB | 482 | − | B | 1.54 | − | − | Y | Y | 5−13 | Y | N | N | N |
| 17 | G | 5 | SB | 604 | − | B | 1.54 | − | − | Y | Y | 5−13 | Y | N | N | N |
| 18 | G | 7 | SB | 554 | − | B | 1.54 | − | − | Y | Y | 3−18 | Y | N | N | N |
| 19 | G | 11 | SB | 482 | − | B | 1.54 | − | − | Y | Y | 6−14 | Y | N | N | N |
| 20 | G | 18 | SB | 480 | − | B | 1.54 | − | − | Y | Y | 6−14 | Y | N | N | N |
| 21 | G | 6 | SB | 602 | − | B | 1.54 | − | − | Y | Y | 6−14 | Y | N | N | N |
| 22 | M | 4 | SB | 508 | − | B | 1.54 | − | − | Y | Y | 14−20 | Y | N | N | N |
| 23 | G | 11 | SB | 482 | − | B | 1.54 | − | − | Y | Y | 14−20 | Y | N | N | N |
| 24 | G | 18 | SB | 480 | − | B | 1.54 | − | − | Y | Y | 14−20 | Y | N | N | N |
| 25 | G | 6 | SB | 602 | − | B | 1.54 | − | − | Y | Y | 14−20 | Y | N | N | N |
Horse 1–13: 13 endurance horses: G (n = 7), M (n = 6). Arab include part Arabian horses, QH, quarterhorse; TB, thoroughbred, endurance exercise; Horse 14–25: 12 untrained trotters, all Standardbred (SB): G (n = 12), fast trot exercise; G, gelding; M, mare. Gr, gray; C, chestnut; B, bay; The riders’ and horses’ performance history includes: age start, indicates age (years) when horse started competing; horse experience, indicates number of years in competition (40 km or more); GI pill, gastrointestinal pill; GPS, global positioning system; HR, heartrate monitor (Polar); BOM (2020); Bureau of Meteorology, local stations closest to location of exercise at varying km distance from the actual event in total 4 endurance locations and 1 trotter racetrack, distance ranged from 5.3 to 53 km; BOM stations were: Roseworthy 27.9 km distance from ride at Sandy Creek; Rosedale station 5.3 km from ride at Tarlee; Meningie station 53 km from ride at Coorong; Nuriootpa station 28.8 km from ride at Sedan; Roseworthy station at 2.2 km from trotter racetrack; N, no; Y, yes; NK, not known; ∧indicates HR only; ∧∧indicates second 40 km only; blood gas analysis included pH, pCO2, pO2, HCO3–, base excess and lactate levels; **indicates biochemistry by VETSCAN (utilizes dry and liquid reagents); TS, total solids; TP, total protein; AST, Aspartate amino transferase; CK, creatinine kinase.