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Hourly 4-second sprints prevent impairment of postprandial fat metabolism

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Re: Hourly 4-second sprints prevent impairment of postprandial fat metabolism

#41

Post by alecco »

tofflos wrote: post #13

> This study determined if the interruption of prolonged sitting (i.e.; 8-h of inactivity) with hourly cycling sprints of only 4-s duration each (i.e.; 4-s x 5 per h x 8-h = 160-s per day; SPRINTS) improves PPL. The 4-s sprints employed an inertial load ergometer and were followed by 45-s of seated rest. So you would need to take a 5 x (4-s sprint + 45-s rest) = 245 seconds exercise break from work every hour and in…

> Does "whole body fat oxidation" mean that the an average male calorie burn of 2500 per day would be multiplied with 1,43 to 3575 calories per day?

No, it means they burned (oxidized) more fat. This would mostly be a higher % with same calories. Doing those tiny intervals of total 2m40s shouldn't raise significantly the total calorie consumption.

Re: Hourly 4-second sprints prevent impairment of postprandial fat metabolism

#42

Post by covidSurvivor19 »

mikekchar wrote: post #31
tofflos wrote: post #13

> This study determined if the interruption of prolonged sitting (i.e.; 8-h of inactivity) with hourly cycling sprints of only 4-s duration each (i.e.; 4-s x 5 per h x 8-h = 160-s per day; SPRINTS) improves PPL. The 4-s sprints employed an inertial load ergometer and were followed by 45-s of seated rest. So you would need to take a 5 x (4-s sprint + 45-s rest) = 245 seconds exercise break from work every hour and in…

> Does "whole body fat oxidation" mean that the an average male calorie burn of 2500 per day would be multiplied with 1,43 to 3575 calories per day? It seems extremely unlikely to me. I hesitate to bring up the 2nd law of thermodynamics because I know if frustrates a lot of people in these discussions. However, bear with me. "Calories" in this context refers to kilocalories. Burning 1 kilocalorie produces enough ener…

Your analysis seems to be in the right direction but I think that the body uses this energy in many more ways than just heat. Moving muscles, pumping blood, keeping ionic gradients in the kidneys, and in cells, producing waste products, do seem to take energy. Also, consider the water we lose due to evaporation just by breathing, we are constantly creating a significant amount of heat and dissipating it into the environment. This extra 1000Kcal would be roughly a 50 watt increase in average metabolic rate during a whole day.

It does seem a bit high but anecdotally, my body temperature is 1C higher on days I do some tennis early in the morning. And more importantly my oftenly cold hands go away, so radiating more of it away.

Re: Hourly 4-second sprints prevent impairment of postprandial fat metabolism

#43

Post by Freeboots »

mgraczyk wrote: post #26
gfxgirl wrote: post #12

I'm confused. "Hourly 4s sprints" sounds like one 4 second sprint every hour but the second paragraph of the summary says > Purpose > This study determined if the interruption of prolonged sitting (i.e.; 8-h of inactivity) with hourly cycling sprints of only 4-s duration each (i.e.; 4-s x 5 per h x 8-h = 160-s per day; SPRINTS) improves PPL. The 4-s sprints employed an inertial load ergometer and were followed by 45-…

Every hour, they do a workout that consists of 5 repetitions of 4s sprints.

Ah, this is probably what they meant. Very poorly explained by them.

Re: Hourly 4-second sprints prevent impairment of postprandial fat metabolism

#44

Post by samatman »

covidSurvivor19 wrote: post #42
mikekchar wrote: post #31

Earlier quoted context omitted.

> Does "whole body fat oxidation" mean that the an average male calorie burn of 2500 per day would be multiplied with 1,43 to 3575 calories per day? It seems extremely unlikely to me. I hesitate to bring up the 2nd law of thermodynamics because I know if frustrates a lot of people in these discussions. However, bear with me. "Calories" in this context refers to kilocalories. Burning 1 kilocalorie produces enough ener…

Your analysis seems to be in the right direction but I think that the body uses this energy in many more ways than just heat. Moving muscles, pumping blood, keeping ionic gradients in the kidneys, and in cells, producing waste products, do seem to take energy. Also, consider the water we lose due to evaporation just by breathing, we are constantly creating a significant amount of heat and dissipating it into the envi…

> This extra 1000Kcal would be roughly a 50 watt increase in average metabolic rate during a whole day.

This calculation makes the theory implausible. A resting human burns about 100 watts[0], this would imply 50% more energy output than that, over the whole day.

I too find that I'm warmer after a workout, and sweat lightly for up to a few hours after my heart rate returns to normal, which itself takes almost an hour. So burning more energy than the workout itself? Absolutely.

1000 calories extra seems high for ~4 minutes of cycle sprinting per hour. The HIIT pacing of it is probably ~just as good as spending the whole 4 minutes cycling steadily though.

All energy leaves the body as either work or heat, so of the processes you mentioned, moving things or yourself with your muscles is the only one that wouldn't raise temperature.

Re: Hourly 4-second sprints prevent impairment of postprandial fat metabolism

#45

Post by samatman »

gvjddbnvdrbv wrote: post #40
monkeypizza wrote: post #7

Earlier quoted context omitted.

Say you are trying to distinguish between a placebo and a cyanide pill; test subjects are young rats (base rate of death extremely low). How large of a sample size do you need? I think one control, one test subject is enough to be certain, because the base rate of death is insanely low, when measured on a per-minute basis. Sample sizes can be small and still very significant when the effect is large.

I would want about four of each rat still. The control could die of something else...

I'm quite confident the only reason to use four rats in a study of cyanide is that you really want to kill two rats.

Re: Hourly 4-second sprints prevent impairment of postprandial fat metabolism

#47

Post by samatman »

swader999 wrote: post #29
dr_dshiv wrote: post #24

Earlier quoted context omitted.

Still probably would not do it. But why? I wonder what other exercise modality this could be replaced with. Do 3 squats?

1 flight of stairs.

a good comparison!

Sprinting up a flight of stairs, then walking back down, and repeating it five times, once an hour.

That I have a good gauge of. Yeah, that would feel good. Pity I live in a first-floor flat...

Re: Hourly 4-second sprints prevent impairment of postprandial fat metabolism

#48

Post by bradlys »

mahesh_rm wrote: post #18

Jumping cold out of your couch/chair and sprinting 5 seconds every hour, multiple times a day, sounds to me like an optimized 'quickly destroy most of your body joints' routine.

To me - it sounds like a great way to throw up or at least get stomach sickness.

I can't imagine going full send with no warm up and not suffering some sort of issue after stopping.

Re: Hourly 4-second sprints prevent impairment of postprandial fat metabolism

#50

Post by AngryData »

Barrin92 wrote: post #22
zebnyc wrote: post #16

Don't we need to warm up before doing any max intensity exercise to prevent injury.

I've read conflicting information about warming up over the years but it at least appears to me that the consensus is slowly moving away from several common exercises such as stretching, which apparently even seems to have negative effects.

It is mostly deep stretching before exercise that seems to be the biggest target. Light quick stretching should still be fine to prevent injury. Deep stretching is only good for maintaining or increasing flexibility especially when bulking up, but should been done as its own exercise with rest afterwards.
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