Lab testing

Has anyone ever done any lab testing as part of their training to get real numbers to work with and did you think it was beneficial?
I am still relatively new to cycling and whilst I think I have been training well each time I have done the Etape (previous 2 years) I have felt censored at the end of it. I have had no problems in any other events or training. I am wondering if understanding my body in detail will help.
Hoping to do the Marmotte next year and want a better end experience.
Found these 2 via google
http://www.theendurancelab.com/
http://www.sportstest.co.uk/
Or if anyone knows if anywhere in Scotland that offers the same service
I am still relatively new to cycling and whilst I think I have been training well each time I have done the Etape (previous 2 years) I have felt censored at the end of it. I have had no problems in any other events or training. I am wondering if understanding my body in detail will help.
Hoping to do the Marmotte next year and want a better end experience.
Found these 2 via google
http://www.theendurancelab.com/
http://www.sportstest.co.uk/
Or if anyone knows if anywhere in Scotland that offers the same service
Tri Coaching
https://www.h3otriathlon.com
https://www.h3otriathlon.com
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Posts
I was tired at the end after 12 cycling but felt good all the time. If you're not very keen on DIY training plans going to someone who'll do the tests and give you customised training plan is a good way to go - but might be more pricey.
I'm fit fat(tish) and soon to I turn 50 so not your typical roady by any means but I reasoned that spending x thousand pounds on bike, kit, gels etc was daft if I was too miserely to fork out 70 or so for a test (1000 SEK in Sweden)
So find somewhere you feel ok about and go for it - but having a clear goal will help them tailor both testing and plans better
Good luck!