Pins and Needles in hands/wrists

iDad
iDad Posts: 68
edited April 2013 in Health, fitness & training
Hi guys....am in serious training mode for an MTB Marathon (75k) event in july....i've been training in the house on a multigym 5days/week with 20-30mins on a Cross trainer as a warm up and an hour to hour n half on the multigym.
my fitness level is improving well and revcovery time is what most impressing me (from what it was) but.......during a (4hr) 37mile XC ride i did the other week i was getting slight "numb / pins n needles" feelings in my hands/wrists after about 2hrs of solid riding, a couple of shakes of the hands and the feelings goes away for a bit...then get the same coming on again throughout the rest of the ride. it was the same on a 2.5hr ride i did the week before at about the same sort of 2hr mark.
i noticed the same after 20mins on the Cross trainer last night, a couple of shakes and the feelings goes away.

i'll drink a lot of fluid when out, on the last ride i'd added some of the SIS Hydro tablets in the camelback, took a banana and a few snack bars with me.
i usually drink water when training at home.

any ideas? is it just my age and lack of long ride fitness?

i'm 41 and 6'2", roughly 16.5st at present.

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