Their recommendation for athletes is 1.2-1.7 g/kg. Comparatively, 0.8 g/kg is often the reference taught in nutrition/dietetics curricula for normal adults. It actually is not very feasible to maintain an intake of 140 g protein/day for a 70 kg adult, since other macronutrient intakes may be undesirably altered (potentially, too few carbs and too much fat, depending on the diet). Excess protein would just end up being excreted in the urine as urea anyway, although extremely high intakes (probably over 2.5 g/kg) may cause kidney damage.

Also, just a note, your “Training Athlete” (0.6-0.9) and “Adult Building Muscle Mass” (0.6-0.9) categories have the same intake levels listed. I would say the former category should probably be around 0.8-1.2, while the latter (we’re talking about serious anaerobic lifting here, more like bodybuilding or powerlifting) would be in the 1.2-1.7 range.

I’m an avid cyclist and with both my cyclist and dietetics hats on see no reason for most cyclists to be consuming more than 1.2 g/kg. Cycling is certainly anaerobic at times, but not nearly enough to require much more dietary protein than that. The fiber damage and repair needs in a cyclist’s legs are simply not on the same level as in a bodybuilder or the like – they’re two separate physiological responses.

Finally, the link I have included has a lot of high-quality information on performance nutrition in topics other than protein needs. I recommend a full reading.

Take care.