Swimming exuberant joy but so tricky. Bigfoot learn importance give medium-ish, sweet-ish snack, no insulin, before swim. Snack lesson end problem of hypoglycemia while swim. 100% effective. Experience brief feeling mastery.
With advance medical knowledge come awareness of new, worse issue. Swimming make blood sugar drop hour, hours, or many hours after swim also (i.e., in addition during swim), never know when happen. Last night, Bigfoot and Bigfoot Spouse try watch Daily Show Hulu. Bubs keep calling out with update re: loose tooth. Bigfoot notice time 10:00PM. Very strange Bubs still awake. Go without saying Bubs not worry, think parents have safety all wrap up with bow. Bigfoot use ice cold feet for push spouse out of bed, force test Bubs’s blood sugar: 64. At 8:30PM was 111. At 6PM dinner time, 121. At 4PM pre-swim: 143.
Treat low: glucose tabs. Wait 15 minutes. 10:15PM. Tooth come out. BS=81. This not seem safe for sleep. Make spouse go into icy kitchen, make peanut butter cracker snack. Convince Bubs eat peanut butter cracker, very difficult because tooth missing afresh, bloody gap. Test again. 10:30PM: 84. How know not drop low again? Not know. Make spouse go make more peanut butter snack. Eventually BS=ninety-something, everyone fall asleep even though Bigfoot pretty sure that not endocrinologically correct procedure.
Today, Bubs write to Coro Center nurse, describe swim sugar problem, ask for advice. This what she write back: You treated the post swim situation perfectly!! [Bigfoot appreciate positive comment so much, eyelashes elongate, curl/hair take on more lustrous sheen upon read this line.]
In regard to your question regarding how to manage potential delayed lows following swim, I have a few suggestions. I would check his BG more frequently after swim to get a better idea of when (if) he drops. [At 9PM: Bubs score 174. Maybe Bigfoot give too big snack? Also, snack peanut butter ice cream---not good choice. Probably should be grilled chicken panini, string cheese, whole grain cereal.) If he is having delayed lows (and if swim is after dinner) you could try giving him less insulin with dinner on swim nights. Another approach would be to give him a post swim snack that includes both carb and protein. Unfortunately with exercise there are general guidelines but experience will be your best teacher.
Bigfoot read this a few times, hunt for valuable kernel. Where guaranteed method for not kill child? Where reassurance Bubs wake up, give rousing call for help if feel low in sleep? Read and read. This a Yoda thing?