Physically active (defined as compliance with current physical activity guidelines (Pate, 1995), age > 65 years, resting BP > 159/99 mm Hg, total cholesterol > 6.2 mmol•L-1, fasting blood glucose > 7.0 mmol•L-1, body mass index (BMI) > 34.9 kg•m-2, current cigarette smokers, individuals with cardiovascular, pulmonary or metabolic disease, pain or discomfort in the chest, dizziness or heart murmur.