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Table 2 Characteristics of Studies with Unsupervised Exercise Components

From: Rates of compliance and adherence to high-intensity interval training: a systematic review and Meta-analyses

Study Reference

Number of Prescribed Unsupervised Sessions

Length of Unsupervised Time Period

FITT Description

HIIT

MICT

Aamot et al. [54]

150 minutes MVPA/week

52 weeks post-intervention

–

–

Bjorke et al. [73]

2 sessions/week

24 weeks

5-10 × 2 min; 80–90% HRR; Running/Walking/Cycling; 60s recovery.

75 min; 40–50% HRR; Running/Walking/Cycling.

Currie et al. [85]

1 session/week

12 weeks post-intervention

Lower limb exercises

Lower limb exercises

Dowd et al. [94]

150 minutes MVPA/week

12 weeks post-intervention

–

–

Emtner et al. [99]

2 sessions/week

8 weeks post-intervention

Pool swimming

–

Gauthier et al. [108]

3 sessions/week

6 weeks

20x30s; 6–8 BORG10 RPE; Wheelchair propulsion; 60s recovery.

30 min; 4–5 BORG10 RPE; Wheelchair propulsion.

Guillamo et al. [118]

4–6 sessions/week

20 weeks post-intervention

3 × 3-5 min; 17–18 BORG20 RPE; Biking; 3 min recovery

–

Heje et al. [123]

3 sessions/week

8 weeks post-intervention

2 sets of 5x10s; Maximal sprints; Biking; 50s recovery.

–

Hesketh et al. [124]

3 sessions/week

12 weeks

4-9x 60s; 80% HR max; Body weight exercises; 60s recovery.

45 min; 50–70% HR max; Home-based exercises.

Howden et al. [129]

3–4 sessions/week

80 weeks

4x4min; 95% HR peak; Running/Biking/Elliptical; 3 min recovery.

–

Ivanova et al. [134]

1–2 sessions/week

24 weeks post-intervention

4-10x 60s; 90% HR peak; Treadmill/Stationary bike/Elliptical; 60s recovery.

20-50 min; 65% HR peak; Treadmill/Stationary bike/Elliptical.

Jung et al. [139]

1–2 sessions/week

4 weeks post-intervention

10x 60s; 90% HR peak; Treadmill/Stationary bike/Elliptical; 60s recovery.

50 min; 65% HR peak; Treadmill/Stationary bike/Elliptical.

Jung et al. [26]

3 sessions/week

52 weeks post-intervention

10x 60s; 90% HR peak; Treadmill/Stationary bike/Elliptical; 60s recovery.

50 min; 65% HR peak; Treadmill/Stationary bike/Elliptical.

Karstoft et al. [142]

5 sessions/week

16 weeks

10x3min; 70% VO2 peak; Walking; 3 min recovery.

60 min; 55% VO2 peak; Walking.

Keogh et al. [147]

4 sessions/week

8 weeks

5x45s; High intensity; Biking; 90s recovery.

20 min; Moderate intensity; Biking.

Locke et al. [157]

75–150 minutes MVPA/week

24 weeks post-intervention

10x60s; 85% HR peak; Walking/Biking/Elliptical; 60s recovery.

30 min; 65% HR peak; Walking/Biking/Elliptical.

Madssen et al. [163]

3 sessions/week

52 weeks post-intervention

4x4min; 85–95% HR max; Running/Biking/Skiing; 3 min recovery.

–

Mendelson et al. [167]

3 sessions/week

16 weeks post-intervention

22x60s; 100% PPO; Cycle ergometer; 60s recovery.

32-44 min; 50% PPO; Cycle ergometer.

Midtgaard et al. [171]

180 minutes MVPA/week

52 weeks post-intervention

–

–

Moholdt et al. [173]

3–4 sessions/week

24 weeks post-intervention

4x4min; 90% HR max; Biking; 3 min recovery.

46 min; 70% HR max; Biking.

Moholdt et al. [174]

3 sessions/week

24 weeks

4x4min; 85–95% HR max; Running/Biking/Swimming; 3 min recovery.

–

Pattyn et al. [184]

150 minutes MVPA/week

52 weeks

–

–

Poon et al. [188]

3 sessions/week

8 weeks

10x60s; 80–90% HR max; Running; 60s recovery.

50 min; 65–70% HR max; Running.

Poon et al. [189]

3 sessions/week

16 weeks post-intervention

6-12x 60s; 80–90% HR max; Running; 60s recovery.

40 min; 65–70% HR max; Walking.

Roy et al. [198]

3 sessions/week

52 weeks

HIIT exercises; 80–90% HR max; Walking/Biking

–

Scott et al. [207]

3 sessions/week

6 weeks

6-10x 60s; 80% HR max; Body weight exercises; 60s recovery.

–

Smith-Ryan et al. [213]

2 sessions/week

12 weeks

10x60s; 75–95% HR max; Home-based exercises; 60s recovery.

–

Taylor et al. [217]

3 sessions/week

52 weeks post-intervention

4x4min; RPE 15–18 BORG20 RPE; Home-based exercises; 3 min recovery.

40 min; RPE 11–13 BORG20 RPE; Home-based exercises.

Valent et al. [226]

2–3 sessions/week

8–12 weeks

6-8 × 2-3 min; 60–80% HRR; Hand cycling; 1-2 min recovery.

–

Vella et al. [227]

3 sessions/week

5 weeks post-intervention

10x60s; 75–80% HRR; Treadmill/Cycle ergometer/Elliptical; 60s recovery.

20 min; 55–59% HRR; Treadmill/Cycle ergometer/Elliptical.

  1. FITT descriptions follow the convention of duration of intervals/exercise, intensity of exercise sessions, modality/type of exercise, and for HIIT interventions, recovery duration. MVPA moderate-to-vigorous physical activity, HR heart rate, HRR heart rate reserve, VO2 volume of oxygen consumption, PPO peak power output, BORG10 RPE rating of perceived exertion based on the 0–10 scale, BORG20 RPE rating of perceived exertion based on the 6–20 Borg scale