National board of health and welfare, (Sweden)

1971

Be active on moderate intensity every day in combination with more intense exercise 2-3 times per week.

Health and fitness

ACSM^a

1978

3-5 times per week, 15-60 min per occasion, 60-90% HRmax on aerobic exercise

Maintain and improve fitness

1990

In 1990, strength training was added

Health Education Authority, (England)

1994

30 minutes of daily moderate intensity physical activity

Health and fitness

Pate R. et al. and CDC^b, Surgeon General (US)

1995 & 1996

30 minutes of at least moderate intensity on most, preferably all, days of the week (150 kcal per day), accumulated in several bouts of at least 10-minutes duration (Pate, 1995)

Health and fitness

ACSM

1998

3-5 times per week, 15-60 min per occasion, 55-90% HRmax on aerobic exercise plus add strength and flexibility training

Maintain or improve fitness

IASO^c

2003

For prevention: 45-60 minutes per day of at least moderate intensity. For maintenance: 60-90 min per day

Prevent obesity or maintain weight loss

ACSM, AHA^d

2007

30 minutes of at least moderate intensity daily or 20 minutes of vigorous 3 times per week. On top of these, strength training twice a week

Health and fitness