(2018) only estimated the energy expended based on a movement sensor (SenseWear armband) and heart rate (HR), respectively. (2000) measured the actual oxygen consumption during the exercise session. In these studies, the energy expenditure was reported to be 250–334 kcal each session. Previously, the energy expenditure during a session of BodyPump has been assessed in young, normal weight, and trained men and women ( Stanforth et al., 2000 Berthiaume et al., 2015 Harris et al., 2018). According to LesMills, this formula results in a high energy expenditure (up to 540 kcal each BodyPump session 1).
The distributor, Les Mills International (2020), pre-choreograph the classes, all based on the same principle a full body-workout with barbell and weights and a high duty cycle: 800–1000 repetitions per session/h, low loads (<35% of 1RM) ( Rustaden et al., 2017) and short rest-intervals (<20 s). This translates into resistance exercise modes with low-loads, high number of repetitions, and short rest-intervals between sets and exercises ( Stanforth et al., 2000 Rixon et al., 2006 Berthiaume et al., 2015 Harris et al., 2018).īodyPump is the most popular resistance-exercise-based group class worldwide, available in almost 15,000 health- and fitness clubs (Les Mills International). A strategy used to augment the energy expenditure in many of these classes is to increase the worktime to rest ratio, i.e., apply a high duty cycle (work time divided by total exercise time). Despite this knowledge, health- and fitness clubs offer different resistance-exercise-based group classes and claim these to be effective in improving body composition and reduce body weight. Increased energy expenditure is imperative if exercise is used to reduce body weight through loss of fat mass however, traditional resistance exercise does not appreciably elevate energy expenditure relative to other exercise modalities (e.g., endurance training) ( Donnelly et al., 2009 Willis et al., 2012 Swift et al., 2018). Traditionally, endurance training have been prioritized as physical activity among overweight and obese, but the American College of Sports Medicine (ACSM) also recommend adults to perform regular resistance exercise ( Garber et al., 2011). Several lifestyle related interventions have been investigated to treat overweight and obesity and prevent weight gain, and today a combination of energy restrictions, physical activity, and behavioral change strategies are recommended ( Donnelly et al., 2009 Laddu et al., 2011 Dombrowski et al., 2014 Samdal et al., 2017). According to the World Health Organization, 40% of the adult female population are classified as overweight and 15% as obese. The worldwide prevalence of overweight (BMI ≥ 25.0 kg/m 2) and obesity (BMI ≥ 30.0 kg/m 2) have increased considerably during the last three decades ( Ng et al., 2014 Di Cesare et al., 2016).
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