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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