The transplanted material seemed to kick the stem cells to a high gear for self-renewal, essentially taking over the production of muscle cells.

移植的物质似乎刺激了干细胞，使它更快速地自我修复，基本取代了肌肉细胞的产生。

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Some of this territory was covered by Mr. Crowley and internist Henry S. Lodge in their previous two "Younger Next Year" books, which focused on exercise as an elixir of youth that can reverse aging processes inside cells and spawned a website, DVDs, workout gear and Aspen retreats.

WSJ: Healthy Reader: 'Thinner This Year,' by Chris Crowley and Jen Sacheck