Effects of 8-weeks of daily time restricted feeding and aerobic exercise on fat oxidation – A randomized controlled trial

Introduction CHO: p = 0.540, η²p = 0.037; EE: p = 0.470, η²p = 0.045; HR: p = 0.570, η²p = 0.033). No significant group-by-time interactions at the absolute maximal fat oxidation rate were observed (fatmax: p = 0.262, η²p = 0.078; CHO: p = 0.966, η²p = 0.002; EE: p = 0.111, η²p = 0.125; HR: p = 0.618, η²p = 0.029). Discussion and conclusion In the current study, the addition of a 16-hour fasting window did not provide any additional improvements in fat oxidation rates beyond an ad libitum control group. This is surprising as both low-intensity training (Achten & Jeukendrup, 2004) and TRF (Jong-Yeon et al., 2002) have independently been shown to improve fat oxidation. We conclude that fatmax training is an effective lifestyle intervention to improve fat oxidation in young healthy individuals. Collectively, these data suggest fatmax training independent of the fed state might be a useful lifestyle intervention in healthy individuals looking to maintain or improve their metabolic health and avoid future metabolic disease. References Achten, J., & Jeukendrup, A. E. (2003). The effect of pre-exercise carbohydrate feedings on the intensity that elicits maximal fat oxidation. Journal of Sports Sciences, 21(12), 1017–1025. https://doi.org/10.1080/02640410310001641403 Achten, J., & Jeukendrup, A. E. (2004). Optimizing fat oxidation through exercise and diet. Nutrition, 20(7-8), 716–727. https://doi.org/10.1016/j.nut.2004.04.005 Aird, T. P., Davies, R. W., & Carson, B. P. (2018). Effects of fasted vs fed-state exercise on performance and post-exercise metabolism: A systematic review and meta-analysis. Scandinavian Journal of Medicine and Science in Sports, 28(5), 1476–1493. https://doi.org/10.1111/sms.13054 Jong-Yeon, K., Hickner, R. C., Dohm, G. L., & Houmard, J. A. (2002). Long- and medium-chain fatty acid oxidation is increased in exercise-trained human skeletal muscle. Metabolism, 51(4), 460–464. https://doi.org/10.1053/meta.2002.31326 Venables, M. C., & Jeukendrup, A. E. (2008). Endurance training and obesity: Effect on substrate metabolism and insulin sensitivity. Medicine & Science in Sports & Exercise, 40(3), 495–502. https://doi.org/10.1249/MSS.0b013e31815f256f