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Table 1 Calf exercise dosage for each group. RM repetition maximum; TUT time-under-tension; DF dorsiflexion; PF plantarflexion; min minutes; S seconds

From: Efficacy of different load intensity and time-under-tension calf loading protocols for Achilles tendinopathy (the LOADIT trial): protocol for a randomised pilot study

 

Group 1

High intensity with high time-under-tension

Group 2

High intensity with low time-under-tension

Group 3

Low intensity with high time-under-tension

Group 4

Low intensity with low time-under-tension

Load intensity

6 RM

6 RM

18 RM

18 RM

Repetition

6

6

18

18

Sets

4

4

4

4

Frequency

3×/week

3×/week

3×/week

3×/week

Duration

12 weeks

12 weeks

12 weeks

12 weeks

Contraction time/rep

3 s concentric

3 s eccentric

1 s concentric

1 s eccentric

3 s concentric

3 s eccentric

1 s concentric

1 s eccentric

Rest in between reps

No

No

No

No

Rest in between sets

2 min

2 min

2 min

2 min

Contraction time per set

36 s

12 s

108 s

36 s

Total contraction time

288 s

96 s

864 s

288 s

Total loading time in session (with rests)

16 min and 48 s

13 min and 36 s

19 min and 12 s

16 min and 48 s

Volitional muscular failure

Yes

Yes

Yes

Yes

Range of motion

0° to 15° DF

0° to 50° PF

0° to 15° DF

0° to 50° PF

0° to 15° DF

0° to 50° PF

0° to 15° DF

0° to 50° PF

Time between sessions

48 h

48 h

48 h

48 h

Exercise form

Seated and standing calf raising both performed on a Smith machine with barefoot

Seated and standing calf raising both performed on a Smith machine with barefoot

Seated and standing calf raising both performed on a Smith machine with barefoot

Seated and standing calf raising both performed on a Smith machine with barefoot