Does Higher Intensity Increase the Rate of Responders to Endurance Training When Total Energy Expenditure Remains Constant? A Randomized Controlled Trial

Background Standardized training prescriptions often result in large variation in training response with a substantial number of individuals that show little or no response at all. The present study examined whether the response in markers of cardiorespiratory fitness (CRF) to moderate intensity endurance training can be elevated by an increase in training intensity. Methods Thirty-one healthy, untrained participants (46 ± 8 years, BMI 25.4 ± 3.3 kg m −2 and V̇ O 2max 34 ± 4 mL min −1 kg −1 ) trained for 10 weeks with moderate intensity (3 day week −1 for 50 min per session at 55