Fig. 6.

Effect of diet on KCl-and norepinephrine (NE)-induced contractions. CR causes an increase in contraction magnitude in response to KCl (a, n = 41) and NE (b, n = 41). The y-axis represents the KCl- or NE-induced tension of aortic rings (grams per milligram) pooled from all ages. The x-axis represents age diet: ad libitum (AL) or caloric restricted (CR). AL data are in white columns and CR data are in grey columns. Data are represented as mean ± SE and were analyzed by one-tailed t tests. Means that are significantly different are indicated by asterisks