Most competitions I have been to had weigh-ins an hour before the competition.
Limited Weight Loss
As you know, having to lift within a hour after Weighing-In severely limits weight loss.
Some Powerlifting Organization allow lifters to weigh as early as 9 am the day before the meet; as do some MMA and Boxing Events.
The lifter that I got "The Art and Science of Making Weight", weighted in with me at 9 am the on Friday at 219 lbs/99.3 kg (in the 220 lb/100 kg Weight Class) before the meet on Saturday.
Lifting for him began Saturday Afternoon. Saturday Afternoon he Weight-In at 239 lbs/108.4 kg.
In my experience from competing in a weight class sport for about ten years, some people handle a large weight cut very well
Amount of Weight Loss
As you know, no athlete that loses 20 or 30 lbs is going to be able to rehydrate in an hour or less and perform well.
Efficient weight cutters will periodically restrict calories, train in a sauna suit or go through a cycle of sweat baths even when they don't have to make weight. Some approaches to weight cutting only involve water, others will severely restrict calories (<1000 per day, either mostly protein and fat or fats and sugar), so the effects will vary.
24 Hour Ahead of Competition Weigh In
The majority of these individual, as you realize, cut water weight.
With a 24 Hour Weight In before lifting, very little severe restriction of calories occurs.
Sauna Suit
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I have the complete Kutting Weight ensemble. That because my gym equipment is in the garage and on the back porch, that has a roof on it.
Temperatures in the winter get down below freezing. Sometimes, I have to sweep the snow off my Power Rack and make a path to it, when it is blowing snow.
I perform my exercise sets in the garage and on the back porch in the winter. Then immediately get back in the house, between sets and exercises. The Kutting Weight Sauna Suit, in layers, allows me to spend a few minute long in the freezing weather.
Rehydration
The most interesting method for rehydration after a 24 hour weigh that I was privy to was in was giving a lifter a glucose IV. One of his buddies was a medical person who had access and knew how make it work.
Practice
As with anything, there is a learning process with cutting weight for competition. It is something that need to experimented with and practiced in the off season.
The Issue With 24 Hour Weigh-In
There is a greater health risk of lifter dropping 20 lbs/9kg to 30 lbs/13.6 kg and then regaining it 24 hour later.
With events that mandate a one hour Weight-In before competition, it's impossible to drop that kind of weight and perform well.
Efficient weight cutters will periodically restrict calories, train in a sauna suit or go through a cycle of sweat baths even when they don't have to make weight.
Heat Shock Protein
Calorie Restriction, Training In Sauna Suites (Heat), etc. are effective methods that are beneficial. Addressed in Post 3...
Heat Shock Protein are elicited during stress such as extreme heat, cold, exercise, starvation (Intermittent Fasting), etc. They promote healing and trigger an anabolic muscle building.
Shocking Muscle Growth | Iron Man Magazine
HSPs transport proteins across cellular membranes, sensing that
they have something to do with increased protein synthesis. ...that
increased muscle protein synthesis is the very core of gains in muscle size and strength, ...
Heat treatment boosts anabolic effect of strength training
We're not quite sure how strength athletes can apply the principle that Japanese sports scientists have written about in the Journal of Physiological Sciences. The equipment the scientists used to enhance post-strength training anabolic processes in muscles is not yet available. At least, not...
ergo-log.com
Heat treatment, or heat stress,
has a mild anabolic effect.
...
heat treatment activates the key anabolic regulator molecule Akt, which starts a cascade of reactions in the muscle cell.
Heat Training: Does it Boost Running Performance?
...A
study performed by
the University of Oregon which tested the ability of cyclists to perform a time trial after spending time training in hot conditions.
Twelve high performance cyclists spent 1
0 days training in a 100-degree room for 100 minutes per day and
experienced an amazing 7% boost in performance...
The Performance Benefits of Training with a Sauna Suit
https://www.acefitness.org/educatio...rmance-benefits-of-training-with-a-sauna-suit
The Bottom Line
The primary finding of this study is that
short-term training in a sauna suit improves heat acclimation and endurance performance.
The athletes who took part in this study saw a
3% increase in their speed after only two weeks of training in the sauna suit. That may not seem like a huge improvement, but it
can easily represent the difference between victory and defeat.
Cooking Cancer
One of cancer's vulnerable weaknesses is heat. Healthy cells are able to withstand heat, cancer cells cannot.
Cancer Centers of America ...
Local hyperthermia is used to
heat a small area like a tumor.
Very high temperatures are used to
kill the cancer cells and
destroy nearby blood vessels. In effect, this
cooks the area that is exposed to the heat. Source:
Hyperthermia to Treat Cancer