G M Kline

Comparison of activity levels using the Caltrac accelerometer and five questionnaires.

P S Freedson, P. Freedson, D. J. Miller, 1994, Medicine and science in sports and exercise.

Estimation of VO2max from a one-mile track walk, gender, age, and body weight.

P S Freedson, P. Freedson, R. Hintermeister, 1987, Medicine and science in sports and exercise.