因为HIIT 训练计划使你的身体达到了极限，这代表着需要更多的能量（卡路里）来恢复身体机能。

Since HIIT is tougher on the body, it requires more energy (read: calories) to repair itself afterwards.

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测试是以跟随训练追踪测试生理机能，系统现察世居高原人在高原训练期间的生理机能变化规律，以便为其高原训练的计划制定理论依据。

By analyzing the changing characteristics of the old peoples physiology function, the paper puts forward prescription for scientific aerobics and evaluation methods.

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