Table 2.

Characteristics of HIIT interventions.

First author, year	Ergometer	High intensity interval (time/intensity)	Recovery interval (time/intensity)	Sessions (days/week)	Session duration	Intervention time	Supervised intervention
Heydari, 2013	Cycle	8 s at 80–90% of HRmax with a cadence between 120 and 130 rpm	12 s at 40 rpm with no change in resistance	3	30 min	12 weeks	All sessions
Kiviniemi, 2014	Cycle	4–6 repetitions of 30 s at maximal load	4 min of passive recovery or without resistance	3	NR	2 weeks	All sessions
Koufaki, 2014	Cycle	30 s at ∼100% of PPO	1 min at 20–30% of PPO	3	30 min	24 weeks	All sessions
Munk, 2009	Treadmill	4 min at 90–95% of HRpeak	3 min at 50% to 70% of HRpeak	3	38 min	24 weeks	2 sessions/week
Piras, 2014	Cycle	1 min at 100% of VO2max with cadence of 70 rpm	2 min at 70 rpm without resistance	3	13 min	12 weeks	All sessions
Ramos, 2017	Cycle/Treadmill	1 × 4 HIIT: 1 × 4 min of 85–95% of HRpeak 4 × 4 HIIT: 4 × 4 min of 85–95% of HRpeak	1 × 4 HIIT: no recovery 4 × 4 HIIT: 3 min of 50–70% HRpeak	3	1 × 4 HIIT: 38 min 4 × 4 HIIT: 17 min	16 weeks	2 sessions/week

HIIT, high intensity interval training; HRmax, heart rate maximal; HRpeak, heart rate peak; NR, not reported; PPO, peak power output; Rpm, rounds per minute; VO2max, maximal oxygen consumption.