There is a lot of references to the debate regarding exercise and weight loss.
But when it gets to exercise and weight maintenance, the consensus is much more clear...
"If the role of PA in weight loss is highly debated, its role in preventing unhealthy weight gain and regain after weight loss is now generally accepted. More recent studies have furthered our understanding of the specific role of PA/SB in weight loss maintenance. In a cross-sectional study, Ostendorf et al.129,130 observed that people who successfully maintained weight loss (maintaining ≥13.6 kg weight loss for ≥1 year) over the long-term expended more energy than people with normal weight with matched BMI or people with obesity whose BMI was similar to the BMI of the weight loss maintainers prior to weight loss. This greater TDEE was associated with higher activity-related EE and PAL values (1.75 vs. 1.61 vs. 1.55 for the successful weight loss maintainers, individuals with normal weight, and those with obesity, respectively). Furthermore, the weight loss maintainers, like the individuals with normal weight, not only spent more time in LPA and less in SB than people with obesity but also spent more time in MVPA than both other groups. This study suggests that maintaining weight loss over the long term is associated with high levels of both LPA and MVPA and reduced sedentary time. It further supports previous findings indicating that a minimum PAL of 1.7–1.8 is required to prevent excessive weight regain."
Why some people have an issue with incorporating exercise as part of their deficit is an active area of research.
But I think they also need to spend more time shifting people's mindset from food to activity for the maintenance side of things.
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