Volume 86, January 1999

Pages 383-390: T. M. Griffin, N. A. Tolani, and R. Kram. "Walking in simulated reduced gravity: mechanical energy fluctuations and exchange." On p. 389, in the legend to Fig. 5, in least squares regression equations for mechanical work and metabolic energy, the ± sign was incorrectly used instead of the + sign. Figure 5 and the corrected legend are reproduced below.

View larger version (17K): [in this window] [in a new window]   Fig. 5.   External mechanical work per unit distance (left axis) decreased to a greater extent than metabolic cost of walking a unit distance (right axis) when gravity was reduced. Lines are least-squares regressions: mechanical work = 0.04 + 0.22 G, R2 = 0.671, 95% confidence limits of slope = 0.13 and 0.32, P < 0.01; metabolic energy = 1.19 + 0.93 G, R2 = 0.549, 95% confidence limits of slope = 0.45 and 1.41, and P < 0.01. Data are for walking at 1 m/s. Mechanical values are means ± SE for 6 subjects; metabolic values are means ± SE for 4 subjects. Metabolic data are from Ref. 16.