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Figure 1 Changes in (A) peak exercise heart rate (HR), (B) exercise time, (C) metabolic equivalents, and (D) peak oxygen consumption during DDD-OFF, DDD-ON, and DDDR-ON modes in patients who achieved <85% (all, n = 20), <70% (n = 11), and 70% to 85% (n = 9) of age-predicted HR during exercise using DDD-OFF mode. Data are expressed as mean values ± SEM. *p values determined by analysis of variance with Bonferroni multiple-comparison tests. White bars = DDD-OFF; ruled bars = DDD-ON; black bars = DDDR-ON.