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Table 2 Number of components assigned to each of four clusters per individual PIFMs by k-means clustering

From: A classification of the plantar intrinsic foot muscles based on the physiological cross-sectional area and muscle fiber length in healthy young adult males

 

Morphological profiles reflecting contractile properties

Number of samples assigned to each cluster per individual PIFMs using k-means clustering

Estimated FL (cm)

Estimated PCSA (cm2)

Cluster 1

Cluster 2

Cluster 3

Cluster 4

ABDH

2.56 ± 0.19

7.81 ± 1.50

14/26

12/26

–

–

ABDM

2.83 ± 0.26

5.15 ± 0.73

–

26/26

–

–

ADDH-OH

1.84 ± 0.16

6.98 ± 1.08

25/26*

1/26*

–

–

ADDH-TH

2.30 ± 0.32

0.56 ± 0.18

–

–

–

26/26

FDB

2.72 ± 0.27

5.99 ± 0.99

2/26†

24/26†

–

–

FHB

2.03 ± 0.34

6.33 ± 1.36

19/26*

6/26*

–

1/26*

QP

4.32 ± 0.34

2.51 ± 0.52

–

–

26/26

–

  1. Values are means ± SD
  2. Hyphen (–) indicates no components classified into each cluster using k-means cluster analysis
  3. *number of samples assigned in cluster 1 significantly higher than those in other cluster(s) (P < 0.05)
  4. †number of samples assigned in cluster 2 significantly higher than those in cluster 2 (P < 0.05)
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Journal of Foot and Ankle Research

ISSN: 1757-1146