FACTORS AFFECTING THE HEART-RATE DURING SELF-PACED WALKING

The results of 277 self-paced walking tests were analyzed for the effects of body composition, sex and age using step-up multiple regression analysis. Equations are given for the influence of the significant factors on chosen walking speeds and on heart rate (fc) (standardized at 4.8 km .cntdot. h-1 by interpolation from points recorded at three walking speeds). The basic equations are normal speed (km .cntdot. h-1) = 1.72 + 2.13 stature (m) - 0.008 age(yr); and fast speed (km .cntdot. h-1) = 0.54 + 3.69 stature (m) = 0.016 age (yr). For men, fc4.8 (beat .cntdot. min-1) = 161 - 50.7 stature (m) + 0.223 body wt (kg); for women, fc4.8 (beat .cntdot. min-1) = 161 - 50.7 stature (m) + 0.223 body wt (kg) + 4.43. The significant factors affecting freely chosen walking speeds are stature and age. When estimates of body composition are available, percentage fat is the most influential single factor affecting fc, while sex no longer has a significant effect, and age now has a negative influence. When allowance is made for these factors the effects of customary physical activity can be seen more clearly.