Skip to main content

Table 1 Physical characteristics, knee extensor strength and quadriceps femoris size variables in sprinters and non-sprinters

From: Relationship of the knee extensor strength but not the quadriceps femoris muscularity with sprint performance in sprinters: a reexamination and extension

 

Sprinters

Non-sprinters

P value

Cohen’s d

Body height, cm

175.2 ± 5.4

174.1 ± 5.5

0.326

0.20

Body mass, kg

65.4 ± 6.1

65.9 ± 7.0

0.709

0.08

Knee extensor strength

 Isometric strength, Nm

272.9 ± 52.0

257.5 ± 47.5

0.140

0.31

 Slow-velocity Isokinetic strength, Nm

189.1 ± 38.8

173.8 ± 34.5

0.047

0.41

 Fast-velocity Isokinetic strength, Nm

128.0 ± 27.5

112.5 ± 23.2

< 0.001

0.60

Quadriceps femoris size

 Proximal CSA, cm2

53.8 ± 7.0

49.3 ± 8.1

< 0.001

0.61

 Middle CSA, cm2

79.0 ± 8.4

77.5 ± 10.6

0.443

0.19

 Distal CSA, cm2

58.2 ± 6.5

58.0 ± 9.1

0.923

0.02

 MV, cm3

2101.5 ± 250.1

2007.4 ± 270.1

0.080

0.36

Knee extensor strength/body mass

 Isometric strength, Nm/kg

4.2 ± 0.6

3.9 ± 0.6

0.050

0.41

 Slow-velocity Isokinetic strength, Nm/kg

2.9 ± 0.5

2.6 ± 0.5

0.017

0.50

 Fast-velocity Isokinetic strength, Nm/kg

2.0 ± 0.3

1.7 ± 0.3

< 0.001

0.69

Quadriceps femoris size/body mass

 Proximal CSA, cm2/kg2/3

3.3 ± 0.4

3.0 ± 0.5

0.001

0.68

 Middle CSA, cm2.kg2/3

4.9 ± 0.4

4.8 ± 0.5

0.241

0.26

 Distal CSA, cm2/kg2/3

3.6 ± 0.3

3.6 ± 0.5

0.731

0.08

 MV, cm3/kg

32.1 ± 2.7

30.5 ± 3.5

0.018

0.53

Knee extensor strength/quadriceps femoris MV

 Isometric strength, kNm/cm3

130.2 ± 22.1

128.5 ± 18.3

0.681

0.08

 Slow-velocity Isokinetic strength, kNm/cm3

90.1 ± 15.7

86.9 ± 14.3

0.299

0.21

 Fast-velocity isokinetic strength, kNm/cm3

61.1 ± 12.1

56.3 ± 10.3

0.044

0.42

  1. Values are presented as mean ± standard deviation, CSA cross-sectional area, MV muscle volume. The slow- and fast-velocity isokinetic knee extensor strengths were measured with 60º/s and 180º/s, respectively