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Mountain biking and insulin advice
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<blockquote data-quote="Scott-C" data-source="post: 1989683" data-attributes="member: 374531"><p>Hi, [USER=398315]@BeckiDover[/USER] , I've not been on a mountain bike for a long time but used to do a fair bit of cycle touring when I was younger.</p><p></p><p>The details are a bit hazy now but I recall that if I was cycling for about 6 hours or so a day I'd seriously tail back bolus shots.</p><p></p><p>A meal which would normally need about 6 to 8 units would come down to about 2. If it was a week long trip I'd also rake back basal by a few units too, not so much for short trips.</p><p></p><p>The way the biology works is that when muscles contract during exercise, a protein called Glut4, glucose transporter, comes to the surface of muscle cells and lets glucose in without the need for insulin, so if you have your normal amount of bolus, you'll get a "double whammy" of both insulin and glut4 lowering levels, so it makes sense to tail back the insulin to avoid that.</p><p></p><p>I found snacking on some jam on oatcakes and dried dates throughout the day a good mix of fast and slow carbs to keep things ticking over.</p><p></p><p>Beware of "after-drop" too. Glut4 can carry on acting for a while after exercise, and your liver and muscles will be restocking the stored glycogen they used up during exercise, so that can drag you low after exercise too, so also consider smaller boluses for meals afterwards too.</p><p></p><p>Have fun!</p></blockquote><p></p>
[QUOTE="Scott-C, post: 1989683, member: 374531"] Hi, [USER=398315]@BeckiDover[/USER] , I've not been on a mountain bike for a long time but used to do a fair bit of cycle touring when I was younger. The details are a bit hazy now but I recall that if I was cycling for about 6 hours or so a day I'd seriously tail back bolus shots. A meal which would normally need about 6 to 8 units would come down to about 2. If it was a week long trip I'd also rake back basal by a few units too, not so much for short trips. The way the biology works is that when muscles contract during exercise, a protein called Glut4, glucose transporter, comes to the surface of muscle cells and lets glucose in without the need for insulin, so if you have your normal amount of bolus, you'll get a "double whammy" of both insulin and glut4 lowering levels, so it makes sense to tail back the insulin to avoid that. I found snacking on some jam on oatcakes and dried dates throughout the day a good mix of fast and slow carbs to keep things ticking over. Beware of "after-drop" too. Glut4 can carry on acting for a while after exercise, and your liver and muscles will be restocking the stored glycogen they used up during exercise, so that can drag you low after exercise too, so also consider smaller boluses for meals afterwards too. Have fun! [/QUOTE]
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