Exercise-training regimens varying duration and bout number.

Columns 3–7 represent the number of hours the flies were exercised on each day. Multiple numbers indicate that flies were subjected to more than one training bout on such days. Column 8 represents p-value for multivariate regression (treatment-by-age) of the negative geotaxis scores for exercised flies compared internally to unexercised controls. Altering the ramping schedule by changing the length of exercise bouts had a highly significant effect on the age-dependent slope of negative geotaxis (hours of exercise-by-age, p<.0001). Altering the number of bouts of exercise did not produce a significant effect (bouts-by-age, p = .7694).