Hi intensity is thought to. So weight, or hard intervals. They kind you could not do 3X a week.

I don't think below tempo riding does.

I know for endurance runners it decreases it by 1/2. Now you can counter it by doing sprints and strength training. When it comes down to it aerobic equals less anaerobic equals more.

My opinion is that anything that encourages or creates leg muscle growth, will increase your testosterone levels. Doing intervals and making bigger tears in the muscle to gain a higher amount of power/ftp will increase your testosterone levels as well. If you are doing such long rides and not nourishing your body properly, I could see how you would start to loose muscle/become emaciated and have your test levels decrease. Just my two cents, I am not a doctor and I do not have any reference material to site.

I'm as good as I ever was...once.

Endurance cycling depletes T. However, 15 minutes of intense weights, crunches, sit-ups, squats will trigger a T increase to balance it.

All gym = T rage. All endurance = T depletion. gym + endurance = T balance.

This is my impression based on a lot of reading in the muscle and fitness literature last year.

But shaving your arms increases it, right?

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...if you're genuinely interested in increasing your testosterone levels, just use the injectable stuff. Or, you could "eat some beefsteak", if you know what I mean.

OK Toby.

Studies have been conclusive across the board. T peaks at some point after intense exercise. The more you exercise after a period of intensity T levels decrease as has been shown by research. Dont know what "few studies" you mean since studies have proven otherwise.

What about loading/unloading the dishwasher, folding towels, etc?

#NoComplaintsHere

no idea on the science, but when i come back from riding all i want to do is screw. so I'd say riding increases T. Unfortunately I'm single, so, um, yeah....this is probably too much information haha

Matt