Table 1 Descriptive statistics for the Achilles and patellar tendon

Achilles tendon

Pre Race

After Race 1

After Race 2

After Race 3

Dominant

Thickness (mm)

4.62 (4.37–4.85)

4.33 (3.80–4.55)

4.35 (3.98–4.67)

4.28 (3.95–4.78)

CSA (mm²)

42.7 (40.3–44.2)

38.9 (35.4–40.7)

36.6 (35.2–38.9)

37.3 (35.2–39.9)

Echogenicity

30.3 (28.3–32.5)

36.7 (31.7–40.3)

35.7 (30.9–40.1)

39.5 (36–42.9)

Non-Dominant

Thickness (mm)

4.98 (4.48–5.2)

4.04 (3.74–4.41)

4.31 (4.02–4.61)

4.21 (3.93–4.57)

CSA (mm²)

43.6 (40.4–46.1)

39.2 (34.5–43.3)

39.9 (35.5–43.1)

39.5 (36.5–44.6)

Echogenicity

30.5 (28.2–35.3)

37.4 (33.2–42.9)

38.2 (34.7–40)

42.9 (38.6–47.4)

Patellar tendon

Pre Race

After Race 1

After Race 2

After Race 3

Dominant

Thickness (mm)

2.87 (2.51–3.13)

2.77 (2.59–3.25)

2.87 (2.45–3.38)

2.85 (2.46–3.35)

CSA (mm²)

82.6 (74.4–96.3)

83.2 (70.6–105.9)

86 (74.5–106.4)

83.2 (70.2–97)

Echogenicity

44.7 (35.5–58.1)

51 (44.4–61)

48 (41.3–62.5)

52.7 (45.9–65.8)

Non-Dominant

Thickness (mm)

2.84 (2.51–3.13)

2.99 (2.55–3.47)

2.90 (2.64–3.24)

2.95 (2.66–3.32)

CSA (mm²)

83.2 (69.5–91)

80.2 (74.7–100)

82.5 (74.8–98.7)

82.3 (72.8–101)

Echogenicity

49 (42.7–59.2)

55.5 (45.2–63.8)

54.9 (45.3–68.3)

57.5 (49.4–69.4)