Table 1 Keywords of the search strategy of the electronic databases

#1

Achill*(.tw)

achill*

Achill*

#2

Triceps surae(.tw)

tendin*

Triceps surae

#3

Tendin*(.tw)

eccentric*

Tendin*

#4

Heel(/)

concentric*

Heel

#5

1 OR 2 OR 3 OR 4

exercise

Pain

#6

Pain(/)

Function

#7

Function(.tw)

Physical therapy

#8

6 OR 7

Physiotherapy

#9

5 AND 8

Exercise therapy

#10

Physical therapy(.tw)

Exercise

#11

Physiotherapy(.tw)

Rehabilitation

#12

Exercise therapy(.tw)

Concentric*

#13

Exercise(/)

Eccentric*

#14

Rehabilitation(/)

Strength training

#15

Concentric*(.tw)

Strengthening

#16

Eccentric*(.tw)

Resistance training

#17

Strength training(.tw)

Randomized controlled trial

#18

Strengthening(.tw)

Controlled clinical trial

#19

Resistance training(/)

Randomized controlled trials as topic

#20

10 OR 10 OR 12 OR 13 OR 14 OR 15 OR 16 OR 17 OR 18 OR 19

Trial

#21

Randomized controlled trial(/)

Placebo

#22

Controlled clinical trial(/)

#23

Randomized controlled trials as topic/

#24

Trial(.tw)

#25

Placebo(.tw)

#26

21 OR 22 OR 23 OR 24 OR 25

#27

9 AND 20 AND 26

1 ADN 2 AND 3 AND 4 AND 5

1 AND 2 AND 3 AND 4 AND 5 AND 6 AND 7 AND 8 AND 9 AND 10 AND 11 AND 12 13 AND 14 AND 15 AND 16 AND 17 AND 18 AND 19 AND 20