Associations of lifetime walking and weight bearing exercise with accelerometer-measured high impact physical activity in later life oleh Ahmed Elhakeem, Kimberly Hannam, Kevin C. Deere, April Hartley, Emma M. Clark, Charlotte Moss, Mark H. Edwards, Elaine Dennison, Tim Gaysin, Diana Kuh, Andrew Wong, Kenneth R. Fox, Cyrus Cooper, Rachel Cooper, Jon H. Tobias