Prolonged unsupervised Nordic walking and walking exercise following six months of supervision in adults with overweight and obesity: A randomised clinical trial

•Efficacy of 6 months unsupervised NW and W training after 6 months of supervision.•Few studies estimated physical exercise in long-unsupervised period of training.•Without supervision overweight/obese subjects reduced adherence and steps count.•NW group maintained some of functional improvements showed with supervision.•Instructor intervention is needed for further improvements after supervised program.