Table 2.
Ride metrics (median and IQR) for jockeys (n = 14) riding in 17 exercise days and 17 trial days.
| Variable | Male | Female | All jockeys | p-value | |||
|---|---|---|---|---|---|---|---|
| Trackwork Ride Metrics | |||||||
| Number of jockeys (n) | 5 | 5 | 10 | ||||
| Number of days recorded (n) | 9 | 8 | 17 | ||||
| Total number of exercise rides (n) | 45 | 40 | 85 | ||||
| Number of horses ridden each day (n) | 6 | (6–7) | 6 | (4–6) | 6 | (6–7) | 0.05 |
| Individual ride time (mins) | 19.0 | (16.2–23.7) | 15.5 | (13.0–18.8) | 17.3 | (14.0–22.8) | 0.003 |
| Median time between rides (mins) | 9 | (7–17) | 10 | (6–13) | 10 | (7–14) | 0.3 |
| Number of horses ridden per hour (horses/hr) | 2.0 | (2.0–2.6) | 2.8 | (2.1–3.1) | 2.3 | (2.0–2.8) | 0.2 |
| Canter time (s) | 352 | (305–406) | 298 | (242–330) | 323 | (288–376) | < 0.001 |
| Canter distance (m) | 2978 | (2583–3574) | 2551 | (2239–2923) | 2802 | (2342–3074) | 0.002 |
| Canter speed (m/s) | 8.5 | (8.0–8.9) | 8.8 | (8.4–9.5) | 8.7 | (8.2–9.3) | 0.04 |
| Stride frequency (strides/s) | 1.95 | (1.89–2.00) | 2.00 | (1.91–2.05) | 1.96 | (1.90–2.04) | 0.005 |
| Magnitude linear acceleration of jockey head (g) | 2.5 | (2.3–3.0) | 2.3 | (1.95–2.6) | 2.4 | (2.05–2.9) | < 0.001 |
| Peak linear acceleration of jockey head (g) | 3.5 | (2.7–3.5) | 3.0 | (2.7–3.5) | 3.2 | (2.8–3.8) | < 0.001 |
| Vertical linear acceleration of jockeys head (g) | 2.9 | (2.5–3.3) | 2.6 | (2.3–2.9) | 2.7 | (2.4–3.1) | < 0.001 |
| Magnitude of displacement of jockeys head (m) | 0.12 | (0.10–0.14) | 0.10 | (0.08–0.13) | 0.12 | (0.09–0.14) | < 0.001 |
| Vertical displacement of jockeys head (m) | 0.13 | (0.11–0.15) | 0.11 | (0.09–0.14) | 0.12 | (0.10–0.15) | < 0.001 |
| Jockey HR at canter (% of HRmax) | 68 | (62–76) | 62 | (59–64) | 63 | (60–70) | < 0.001 |
| Jockey TRIMP score | 0.97 | (0.77–1.25) | 0.73 | (0.41–0.83) | 0.83 | (0.57–1.07) | < 0.001 |
| Trial Ride Metrics | |||||||
| Number of jockeys (n) | 6 | 4 | 10 | ||||
| Number of days recorded (n) | 11 | 6 | 17 | ||||
| Total number of trial rides (n) | 52 | 30 | 82 | ||||
| Number of horses ridden each day (n) | 5 | (3–7) | 5 | (5–7) | 5 | (3–7) | 0.6 |
| Individual ride time (mins) | 9.8 | (8.7–11.4) | 9.4 | (8.0–10.4) | 9.6 | (8.5–11.1) | 0.2 |
| Median time between rides (mins) | 5.7 | (2.2–17.5) | 14.3 | (2.9–21.2) | 8.5 | (2.2–19.0) | 0.3 |
| Number of horses ridden per hour (horses/hr) | 2.5 | (2.2–3.2) | 2.5 | (2.2–2.7) | 2.5 | (2.2–3.1) | 0.7 |
| Trial time (s) | 64 | (56–75) | 65 | (60–77) | 64 | (56–76) | 0.4 |
| Trial distance (m) | 1072 | (930–1256) | 1103 | (965–1252) | 1086 | (942–1252) | 0.6 |
| Trial speed (m/s) | 16.7 | (16.2–17.1) | 16.4 | (16.0–16.7) | 16.6 | (16.1–16.9) | 0.03 |
| Stride frequency (strides/s) | 2.33 | (2.25–2.40) | 2.33 | (2.25–2.42) | 2.33 | (2.25–2.42) | 0.3 |
| Magnitude linear acceleration of jockey head (g) | 1.7 | (1.4–2.1) | 1.3 | (1.2–1.6) | 1.5 | (1.3–2.0) | < 0.001 |
| Peak linear acceleration of jockey head (g) | 2.8 | (2.3–3.5) | 2.0 | (1.7–2.5) | 2.5 | (2.0–3.1) | < 0.001 |
| Vertical linear acceleration of jockeys head (g) | 2.4 | (1.8–3.1) | 1.9 | (1.5–2.1) | 2.1 | (1.6–2.9) | < 0.001 |
| Magnitude of displacement of jockeys head (m) | 0.06 | (0.05–0.07) | 0.04 | (0.03–0.05) | 0.05 | (0.04–0.07) | < 0.001 |
| Vertical displacement of jockeys head (m) | 0.07 | (0.05–0.96) | 0.05 | (0.04–0.06) | 0.06 | (0.05–0.09) | < 0.001 |
| Jockey HR during trial (% of HRmax) | 87 | (79–92) | 84 | (77–87) | 85 | (78–91) | 0.3 |
| Jockey TRIMP score | 0.93 | (0.73–1.08) | 0.82 | (0.69–0.98) | 0.87 | (0.7–1.03) | 0.04 |
*Canter was defined as speeds > 6.9 m/s and < 13.9 m/s.