Wednesday, 14 March 2012

Gaining muscle and losing fat at the same time: A more customized approach based on strength training and calorie intake variation

Health Correlator: Gaining muscle and losing fat at the same time: A more customized approach based on strength training and calorie intake variation


Monday, March 12, 2012

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In the two last posts I discussed the idea of gaining muscle and losing fat at the same time (1) (2). This post outlines one approach to make that happen, based on my own experience and that of several HCE (3) users. This approach may well be the most natural from an evolutionary perspective.

But first let us address one important question: Why would anyone want to reach a certain body weight and keep it constant, resorting to the more difficult and slow strategy of “turning fat into muscle”, so to speak? One could simply keep on losing fat, without losing or gaining muscle, until he or she reaches a very low body fat percentage (e.g., a single-digit body fat percentage, for men). Then he or she could go up from there, slowly putting on muscle.

The reason why it is advisable to reach a certain body weight and keep it constant is that, below a certain weight, one is likely to run into nutrient deficiencies. Non-exercise energy expenditure is proportional to body weight. As you keep on losing body weight, calorie intake may become too low to allow you to have a nutrient intake that is the minimum for your body structure.

Unfortunately eating highly nutritious vegetables or consuming copious amounts of vitamin and mineral supplements will not work very well, because the nutritional needs of your body include both micro- and macro-nutrients that need co-factors to be properly absorbed and/or metabolized. One example is dietary fat, which is necessary for the absorption of fat-soluble vitamins.

If you place yourself into a state of nutrient deficiency, your body will compensate by mounting a multipronged defense, resorting to psychological and physiological mechanisms. Your body will do that because it is hardwired for self-preservation; as noted below, being in a state of nutrient deficiency for too long is very dangerous for one's health. Most people cannot oppose this body reaction by willpower alone. That is where binge-eating often starts. This is one of the key reasons why looking for a common denominator of most diets leads to the conclusion that all succeed at first, and eventually fail (4).

If you are one of the few who can oppose the body’s reaction, and maintain a very low calorie intake even in the face of nutrient deficiencies, chances are you will become much more vulnerable to diseases caused by pathogens. Individually you will be placing yourself in a state that is similar to that of populations that have faced famine in the past. Historically speaking, famines are associated with decreases in degenerative diseases, and increases in diseases caused by pathogens. Pandemics, like the Black Death (5), have historically been preceded by periods of food scarcity.

The approach to gaining muscle and losing fat at the same time, outlined here, relies mainly on the following elements: (a) regularly conducting strength training; (b) varying calorie intake based on exercise; and (c) eating protein regularly. To that, I would add becoming more active, which does not necessarily mean exercising but does mean doing things that involve physical motion of some kind (e.g., walking, climbing stairs, moving things around), to the tune of 1 hour or more every day. These increase calorie expenditure, enabling a slightly higher calorie intake while maintaining the same weight, and thus more nutrients on a diet of unprocessed foods. In fact, even things like fidgeting count (6). These activities should not cause muscle damage to the point of preventing recovery from strength training.

As far as strength training goes, the main idea, as discussed in the previous post, is to regularly hit the supercompensation window, with progressive overload, and maintain your current body weight. In fact, over time, as muscle gain progresses, you will probably want to increase your calorie intake to increase your body weight, but very slowly to keep any fat gain from happening. This way your body fat percentage will go down, even as your weight goes up slowly. The first element, regularly hitting the supercompensation window, was discussed in a previous post (7).

Varying calorie intake based on exercise. Here one approach that seems to work well is to eat more in the hours after a strength training session, and less in the hours preceding the next strength training session, keeping the calorie intake at maintenance over a week. Individual customization here is very important. Many people will respond quite well to a calorie surplus window of 8 – 24 h after exercise, and a calorie deficit in the following 40 – 24 h. This assumes that strength training sessions take place every other day. The weekend break in routine is a good one, as well as other random variations (e.g., random fasts), as the body tends to adapt to anything over time (8).

One example would be someone following a two-day cycle where on the first day he or she would do strength training, and eat the following to satisfaction: muscle meats, fatty seafood (e.g., salmon), cheese, eggs, fruits, and starchy tubers (e.g., sweet potato). On the second day, a rest day, the person would eat the following, to near satisfaction, limiting portions a bit to offset the calorie surplus of the previous day: organ meats (e.g., heart and liver), lean seafood (e.g., shrimp and mussels), and non-starchy nutritious vegetables (e.g., spinach and cabbage). This would lead to periodic glycogen depletion, and also to unsettling water-weight variations; these can softened a bit, if they are bothering, by adding a small amount of fruit and/or starchy foods on rest days.

Organ meats, lean seafood, and non-starchy nutritious vegetables are all low-calorie foods. So restricting calories with them is relatively easy, without the need to reduce the volume of food eaten that much. If maintenance is achieved at around 2,000 calories per day, a possible calorie intake pattern would be 3,000 calories on one day, mostly after strength training, and 1,000 calories the next. This of course would depend on a number of factors including body size and nonexercise thermogenesis. A few calories could be added or removed here and there to make up for a different calorie intake during the weekend.

Some people believe that, if you vary your calorie intake in this way, the calorie deficit period will lead to muscle loss. This is the rationale behind the multiple balanced meals a day approach; which also works, and is successfully used by many bodybuilders, such as Doug Miller (9) and Scooby (10). However, it seems that the positive nitrogen balance stimulus caused by strength training leads to a variation in nitrogen balance that is nonlinear and also different from the stimulus to muscle gain. Being in positive or neutral nitrogen balance is not the same as gaining muscle mass, although the two should be very highly correlated. While the muscle gain window may close relatively quickly after the strength training session, the window in which nitrogen balance is positive or neutral may remain open for much longer, even in the face of a calorie deficit during part of it. This difference in nonlinear response is illustrated through the schematic graph below.


Eating protein regularly. Here what seems to be the most advisable approach is to eat protein throughout, in amounts that make you feel good. (Yes, you should rely on sense of well being as a measure as well.) There is no need for overconsumption of protein, as one does not need much to be in nitrogen balance when doing strength training. For someone weighing 200 lbs (91 kg) about 109 g/d of high-quality protein would be an overestimation (11) because strength training itself pushes one’s nitrogen balance into positive territory (12). The amount of carbohydrate needed depends on the amount of glycogen depleted through exercise and the amount of protein consumed. The two chief sources for glycogen replenishment, in muscle and liver, are protein and carbohydrate – with the latter being much more efficient if you are not insulin resistant.

How much dietary protein can you store in muscle? About 15 g/d if you are a gifted bodybuilder (13). Still, consumption of protein stimulates muscle growth through complex processes. And protein does not usually become fat if one is in calorie deficit, particularly if consumption of carbohydrates is limited (14).

The above is probably much easier to understand than to implement in practice, because it requires a lot of customization. It seems natural because our Paleolithic ancestors probably consumed more calories after hunting-gathering activities (i.e., exercise), and fewer calories before those activities. Our body seems to respond quite well to alternate day calorie restriction (15). Moreover, the break in routine every other day, and the delayed but certain satisfaction provided by the higher calorie intake on exercise days, can serve as powerful motivators.

The temptation to set rigid rules, or a generic formula, always exists. But each person is unique (16). For some people, adopting various windows of fasting (usually in the 8 – 24 h range) seems to be a very good strategy to achieve calorie deficits while maintaining a positive or neutral nitrogen balance.

For others, fasting has the opposite effect, perhaps due to an abnormal increase in cortisol levels. This is particularly true for fasting windows of 12 – 24 h or more. If regularly fasting within this range stresses you out, as opposed to “liberating” you (17), you may be in the category that does better with more frequently meals.

9 comments:

john said...
Hi Ned, Depending on the starting point, I would guess it's of similar difficulty to build muscle without gaining fat than it is to build muscle and lose fat at the same time. That is, the plan to cut fat, then build muscle, is flawed because of old bodybuilding myths. One can make it sound good in theory, but to someone informed, it is obviously false. I never understood the purpose of "calorie cycling." Changing hormonal balance will predispose someone to partition calories in a desirable way [to muscle, away from fat]. Micro-managing calorie intake between training and non-training days is probably only necessary for someone looking to achieve extremely low levels of bodyfat, like bodybuilder levels. Protein level is often a hotly debated topic. I think beginners can get away with less, but for people near elite status, you need more--maybe like 1g/lb. There's a big difference in body stress between my squat (2.5x bw) and my sister's, so I could only imagine people with 4x bw or so. My strength levels decrease if I don't consciously eat protein above appetite (I don't use protein powder--sometimes gelatin).
Anonymous said...
Hello Ned, Great post. I know this one was all about the food, but I hope you don't mind me asking two exercise questions. One, is there any way HIIT can fit into this? Before reading about the theory of supercompensation, I thought that brief, but intense, "aerobic" exercise (to the point of becoming anaerobic) was the one exercise proven to reduce fat, while also proving just as successful with strength gains (in less time = efficiency). So this would seem to achieve both "weight loss" and "muscle gain". Two, on a related note, say one were to include running sprints on top of the strength training you mention. Would there be two different supercomposition windows, one for sprints and one for weights? Or would these exercises need to be alternated? Thanks! And sorry if you answered these in the past. I've only recently discovered this excellent blog, and I'm making my way through the archives! Angela
Ned Kock said...
Hi John. Definitely the perception among elite BBs is that a lot of protein must be eaten. The odd thing about this is that even an elite BB will not store more than 15 g/d of protein in muscle: http://bit.ly/esosFA
Ned Kock said...
Hi Angela. Sprints tend to lead to some muscle gain, but not as much as weight training. The reason may be that it is difficult to achieve progressive overload beyond a certain point. Once you can do a 100 m sprint at a certain speed, it is difficult to keep on decreasing the speed. And if you keep on increasing the distance, you’ll soon be leaving the anabolic range. This a general problem that applies to many bodyweight exercises as well. You can make them more difficult, but only up to a point. Many people achieve a level of muscularity with sprint-like exercises that they are happy with, and then focus only on keeping it that way.
Anonymous said...
Very similar to "Lyle McDonald - The Ketogenic Diet". Maybe interesting to you, as he goes quite into detail about this.
Ned Kock said...
Hi Anon. I am not sure the approach described in this post would be really ketogenic. See below: http://bit.ly/hqOTCY
john said...
You make the case one can store about 15g/day... ...What about daily potential protein loss/turnover? I would imagine it would be higher with higher muscle mass? I have been fortunate to train with two powerlifting world record holders [Joe McAuliffe, Tony Conyers] and both have told me about failures on a higher carb, low protein diet; I have read the same from others--Dan John, Mark Felix, Kai Greene--online. Of course things can be a little distorted when we're talking about someone like Kai Greene, being at the extreme in terms of muscle mass and anabolic drug use [probably--heh].
Ned Kock said...
Hi John. Not stuffing oneself with protein is not the same as going on a low protein diet. Now, I’d be interested to know about details. It’d be great if I could get my hands on actual numbers of calories, macros, micros, exercise etc. employed. I hear all sorts of things from people. Once the numbers are entered into HCE, and a careful correlation/graph analysis is done, as in the post below, the picture is a lot different: http://bit.ly/vReN6y
Ned Kock said...
Sorry, I got the link wrong in my previous comment: http://bit.ly/ugi1Lp

Monday, 12 March 2012

Altra Adam Review - A KSO-Like Shoe, Sans Toes?

Altra Adam Review - A KSO-Like Shoe Sans Toes?

Altra Adam Review - A KSO-Like Shoe Sans Toes?


Here's an oft-heard frustration from would-be Vibram FiveFingers fans:
"I want to get the 'barefoot feel' of the FiveFingers, but my toes are [too long/too short/too crooked/downright uncooperative]. What other minimalist shoes could I wear that would feel the same?"

Unfortunately, the answer to this query has usually been, "You're outta luck." Of course, while there's always the option of going actually barefoot (something we tend to forget!), if you couldn't do toe shoes, your next option was going to be something a lot stiffer-soled than what you get with a pair of Vibrams.

That is, pretty much, until the Altra Adam (or Eve for women) came out. I can't go so far as to say that Altra Adam has replicated the benefits of toe shoes in a traditional, mitten-like shoe, but the Altra Adam probably gets about as close as possible — surely as close as anyone to date.

And that's what I'm reviewing today. Now that you've seen Joey's first look at the Altra Adam, it's time for a full review. Read on!
 

Meet the Zero-Dropped Altra Adam

The Altra Adam simultaneously reminds me of a non-five-toed pair of KSO FiveFingers, a pair of aqua shoes, and a pair of Chacos worn with socks. In short, it's an odd looking shoe (and I'll go into the aesthetic briefly later).

Before I dive into the design, take a look at what comes in the box — shoes, two different insoles to customize the cushioning/ground-feel/support, and a whole lot of instructions:

But lest you think the instructions are limited to the box itself, rest assured that there's even more information in a booklet that comes with the Altra Adams. The short of it is that Altra really wants to get people off to the right start when it comes to moving naturally, and they realize that the temptation for most barefoot-style newbies (Into walking, running, or whatever) is to hit the ground running — when they should take it slowly. Shoes aren't magic, after all, and if you've spent a few years or decades learning to move in shoes with elevated heels and a heap of cushioning, you're assuredly going to have to rehabilitate your feet, your legs, and you nervous system (No joke). It takes time. Be patient.

Anyway, just check out all the literature you get in the box (some of it marketing material, of course):
Pretty impressive, no?
As far as those insoles are concerned, with the Altra Adam, there are three basic configurations:
While I applaud the customize-ability of these options, I can't help but think that it's a little overkill to include two insole options. For me, I opted for the thin foam sole in most of my testing (more on this later in function/feel).

Design

Upper and straps — I mentioend that the Adams reminded of wearing Chacos with socks because the straps, which are velcro and work to secure the fit, are in two places — one over the top of the foot and another that crisscrosses over the instep. Underneath these straps is a stretchy fabric and mesh that is incredibly reminiscent of the FiveFingers KSO: just contrast the KSOs pictured here with the picture at the right. See?

Meanwhile, Altra has placed bits of sturdier, structure-giving fabric at key locations on the shoe: as a sling around the heel (also note the upper that wraps the heel has some padding to it to make it comfortable against your Achilles tendon), to bolster the upper strap, and in two pieces as a toe guard at the front of the shoe.
Sole — The Altra Adam's sole features a five-toed pattern at the end and is, once again, reminiscent of the original FiveFingers sole (that's a pic of a pair of women's KSOs). The sole of the Adam is basically smooth and comprised of a thin rubber. How thin, you ask? Just 3.4mm! (That's .1 mm thinner than the most basic FiveFingers sole). The sole has no arch support and is neutral from heel to toe (It's "Zero-drop". As noted above, comes with various options for cushioning (essentially, zero, a little, and a little more).
Take a stroll around the Altra Adam via these photos:

Function and Barefoot Feel

I tested the Adams by walking around and doing "normal" stuff in them, including a few workouts (squats/dead lifts). You can learn a lot about a shoe by simply walking around in it — particularly if you've (re-)learned to walk more naturally. The Altra Adam's are great in that they are lightweight, neutral, and very flexible. This means that I don't ever feel like my heel is "catching" the ground too soon in my stride; it also means that I feel extremely grounded with 250 lbs. on my back.

My most exacting testing of the Altra Adam came from a hike up Kennesaw Mountain outside of Atlanta, completed with a 25 lb. two-year-old strapped to my back via a Kelty 2.0 Child Carrier*. This is a somewhat rocky, fairly quick mile-long trail up the mountain — you ascend about 660 ft. over the mile up. Despite having a sometimes flailing two-year old on my back, the Altra Adams kept me sure-footed; it's often heard, "Don't you need ankle support for hiking? You could twist your ankle in those." Well, not in my experience — it seems that being close to the ground allows you to sense when your footing is shifting and adjust fast enough to avoid rolling an ankle. I'd say most hiking shoes need ankle support because they are built to bomb over any obstacle without any thought.

Anyway, I was able to even do a few short bursts (say 25 yards at a time) of running down the mountain with the toddler/pack on my back and I had zero issues and never felt unsafe. Mind, the Adams don't have a very aggressive tread, so that is certainly something to consider if you plan on running trails in them, but overall, I was very pleased with my hiking experience in the Adam.

Overall ground feel — with or without the most minimal insole that is included — is excellent. It's odd**, I'd still peg it as slightly less than KSO or Classic FiveFingers, but the Adams unquestionably provide more ground feel than you get with the Bikila-, Trek-, or KomodoSport-soled Vibrams. If you're after ground feel in a pair of shoes, I'd say the Altra Adam is about as good as you can get*** — certainly the best I've tested to date in a pair of non-toe shoes.

Now if I had to pick on the Adams, I'd cite three things. First, the shoe just feels a little prototypical — as if it's not quite the final product. Mind, the ones I tested are the final product. It's just sort of an overall impression of the shoe that feels unrefined — almost like you're looking at a model built purely to test out function, with the intention of cleaning it up in the final production. Note, I'd basically make the same complaint about the KSO as compared to virtually any of the more recent FiveFingers models.
Second, the strap over the front of the foot is a bit stiff and uncomfortable. I found it irritated my feet a bit and just nags at my consciousness saying, "Hey I'm here!"
Thankfully, I think these two complaints were in no way unique to my experience and Altra is releasing a considerably more refined product with their Samson (men's) and Delilah (women's) (will be testing these soon!). I think if you take a quick peek at the Samson you'll see what I mean almost instantly.

The third nit is both a complaint and a kudos. It has to do with the toe guard, which doubles as a toe catch. One issue I've had with non-toe shoes is that when you dorisflex (point toes skyward), the shoes don't respond well. Awesomely, the Adam's toe guard/catch does a pretty awesome job of catching a dorisflexed big toe on the way up, and in turn, lifting up the sole. The only problem is that sometimes it doesn't work as well as others and my big toe doesn't get caught by the guard, and just ends up pulling against the stretchier fabric of the upper (Compare these two photos here and here and notice how in the second, my big toe is pulling at the fabric at the front of the Adams, but it doesn't in the first).

Ah one last thing about the insoles. My initial thought on the insoles was that I'd likely wear them with no insole at all. But what I found is that I actually find the Altra Adams to be considerably more comfortable with the most basic insole; for some reason, insoles removed entirely, the Adam feels incomplete and for some reason, the rubber sole curves up at the midfoot/metatarsels of my foot at an angle that annoys — but only when I don't have the insole in place. Meanwhile, wearing one foot with and one foot without the insole, the ground feel really didn't seem very different — so I just bypassed the sole angle issue entirely and kept the basic insole in.

Here are some photos of the Adams on my feet:

Aesthetics

I'll only touch on this briefly but something about the Adam really reminds me of an aqua shoe. I suppose you could say the same about KSO FiveFingers. Well, I did sorta hint at the Adam being "KSO-Like" in the title of this review, right?

So the Adam looks a little aquatic; so what? Function over form, right? If you wear toe shoes regularly, you already adhere to this. Probably the only complaint you could make is that you'd like a shoe to look more like a shoe (Well, maybe the Samson solves that little problem, too — we'll see!)

Conclusion

All in all if you're after a barefoot-style function and feel in a shoe, the Altra Adam practically/protyptically nails it (and I'm excited to see the reload with the Samson!). It provides fantastic ground feel (virtually the best of any minimalist shoe out there) that will leave you surefooted and moving naturally with healthy biomechanics. It's got some design imperfections, but Altra seems to be listening and if the above-mentioned concerns bother you, maybe check out the Samson.

Pricewise, the Adam is going to set you back $80 but that's with free shipping and free exchanges from Altra, which should allay sizing concerns. Altra says to size down if you plan to wear them without insoles, but my 10.5s (my normal shoe size) seem fine either way (actually I'd be worried about the insole-less spurred sole/metatarsel rubbing being worse if I sized down a half size).

Who else has the Altra Adam? What about the women's Altra Eve? What do you think? Let's hear it in the comments!

Thursday, 23 February 2012

Researcher Study Just How Little Exercise You Need. Awesome!

Researcher Study Just How Little Exercise You Need. Awesome. Now here’s some researchers an exercise-averse person like me has gotta love.

“Millions of Americans don’t engage in much exercise, if they complete any at all and asked why, a majority of respondents, in survey after survey, say, ‘I don’t have time.’ Now Gretchen Reynolds reports that instead of wondering justhow much exercise people really need in order to gain health and fitness, a group of scientists in Canada are turning that issue on its head and asking, how little exercise do we need to maintain fitness and the answer appears to be, a lot less than most of us think — provided we’re willing to work a bit. Most people have heard of intervals, or repeated, short, sharp bursts of strenuous activity, interspersed with rest periods. Almost all competitive athletes strategically employ a session or two of interval training every week to improve their speed and endurance. Researchers have developed a version of high-intensity interval training (HIIT) that involves one minute of strenuous effort, at about 90 percent of a person’s maximum heart rate (which most of us can estimate, very roughly, by subtracting our age from 220), followed by one minute of easy recovery. The effort and recovery are repeated 10 times, for a total of 20 minutes and the interval training is performed twice a week. Despite the small time commitment of this modified HIIT program, after several weeks of practicing it, both the unfit volunteers and the cardiac patients showed significant improvements in their health and fitness. ‘A growing body of evidence demonstrates that high-intensity interval training can serve as an effective alternate to traditional endurance-based training, inducing similar or even superior physiological adaptations in healthy individuals and diseased populations, at least when compared on a matched-work basis.’”
I lifted the above from Slashdot, a respected site that has been around forever. It’s well worth visiting the actual post as the commenters typically rise above the average Neanderthal comment and usually add something of value to the post subject.
A New York Times blog posting you can find here goes into more detail about the research, where cardiac patients(!) were asked to exercise ‘bat-shit crazy’ (technical term) for 1 minute then rest for 1 minute – and repeat 10 times. They did this twice a week. The researchers were amazed at just how much good this did them – and the patients basically said: yeah, it sucks, but at least it doesn’t last all that long.
What surprises me is that the researchers didn’t end up killing a bunch of cardiac patients.
This probably isn’t news to a number of readers – the Paleo and Primal diet folks have said for years that this sort of punctuated exercise is probably what Grok (their name for the archetype caveman they strive to emulate) did – and that’s what we were designed for.
Unfortunately, I am still sitting on my ass instead of doing it. I bought an interval training timer a while back – it’s somewhere. Like the guy who watches Food Network while eating TV dinners, or home repair shows while his own home repairs are neglected, I am still a voyeur of exercise – not a participant.
Luckily, I am expert in giving myself excuses – I’ll leave you mine just in case you need some for yourself:
  • “Well, I should really consult with my doctor first – you should consult your physician before any exercise program – right?”
  • ”What do doctors know? I might drop dead anyway !” (to use after visiting the doctor)
  • “Spring is around the corner – I’ll start it then.”
  • “I have to find my interval timer I bought. I’ll have to look for that later.”
  • “I don’t have any exercise clothes that fit me – I’ll have to buy some first.”
  • “I always feel like an idiot when I exercise.”
Let me know if you have any good excuses – I’ll add them to my collection.
My favorite one – a quote from somebody or other – that I always pull out if someone asks me if I exercise is this:
Whenever I get the urge to exercise I lie down until the feeling passes.
And let’s not forget the late John Candy’s exercise sketch from SCTV:

Matt Metzgar: Sprint less, Variations of Sprint 8

Matt Metzgar: Sprint less, Variations of Sprint 8

February 22, 2012

Variations of Sprint 8

Following up on the last post, I think there are many ways to get the benefits of sprinting. I thought it was interesting that in the video associated with the last post, Mercola stated that he only did Sprint 8 once per week instead of the recommended 3 times per week.
Along those same lines, Clarence Bass recently wrote about interval training. He writes:
"My concern, however, is that three hard interval sessions a week is too much for most people to sustain; they’ll do it—even enjoy it—under supervision (as in the Little study), but they’re not likely to keep doing it on their own. Hard training every workout is asking for trouble; it is neither fun nor productive. My own experience is that one or at most two hard interval workouts a week is all I can tolerate effectively, especially in the context of a balanced program of strength and aerobic training."
Clarence has been doing intervals for decades, and I put a lot of stock into what he has to say.
My own experience mirrors this point of view. When I've tried to do the full Sprint 8 programs 3 times per week, I can do it for a month or so, but then I burn out. Conversely, I can do hard intervals once a week and continue month after month.
So we know sprinting once a week is sustainable, but what are the other options? Chris over at Conditioning Research (who by the way just released a new book titled Hillfit) pointed to a study the other month about a minimalist sprinting routine.
Here is an interesting part of the study:
"Several recent studies have suggested that high-intensity interval training (HIT), a training model involving a series of 30-second ‘all-out’ cycling sprints (i.e. Wingate sprints) with 4 minutes of rest/recovery between each bout, may provide a time-efficient strategy for inducing adaptations that are similar to traditional cardiorespiratory training (Gibala et al. 2006; Burgomaster et al. 2005; Burgomaster et al. 2008; Rakobowchuk et al. 2008; Burgomaster et al. 2007; Trilk et al. 2010).
Furthermore, we have recently demonstrated the beneficial effects of HIT on insulin sensitivity (Babraj et al. 2009), a finding that has since been confirmed by others (Little et al. 2011; Richards et al. 2010; Whyte et al. 2010). However, whilst these observations are interesting from a human physiological perspective, their translation into physical activity recommendations for the general population is uncertain for two reasons. Firstly, the relatively high exertion associated with ‘classic’ HIT sessions requires strong motivation and may be perceived as too strenuous for many sedentary individuals (Hawley and Gibala 2009). Secondly, although a typical HIT session requires only 2-3 minutes of actual sprint exercise, when considered as a feasible exercise session including a warm-up, recovery intervals and cool-down, the total time commitment is more than 20 minutes, reducing the time efficiency(Garber et al. 2011). Thus, there is scope for further research to determine whether the current HIT protocol can be modified to reduce levels of exertion and time-commitment whilemaintaining the associated health benefits."
In short, they suggest that the benefits of sprinting could be obtained with a reduced workload.
Here is their formulation:
"It has consistently been shown that a single 30-second Wingate sprint can reduce muscle glycogen stores in the vastus lateralis by 20-30% (Esbjornsson-Liljedahl et al. 1999; Parolin et al. 1999; Esbjornsson-Liljedahl et al. 2002; Gibala et al. 2009). What is intriguing, however, is that glycogenolysis is only activated during the first 15 seconds of the sprint and is then strongly attenuated during the final 15 seconds (Parolin et al. 1999). Moreover, activation of glycogenolysis is inhibited in subsequent repeated sprints (Parolin et al. 1999). This suggests that the traditional HIT protocol (4-6×30 seconds) may be unnecessarily strenuous as similar glycogen depletion may be achieved using 1-2 sprints of shorter duration (15-20 seconds). In turn, this would make the training sessions more time-efficient, less strenuous and more applicable to the largely sedentary general population."
Thus, they are saying that traditional sprinting programs may be overkill in a way, and that you could deplete glycogen just as well by doing 1-2 sprints of 15 to 20 seconds.
This I think leads to a real insight: if you cut the number and duration of sprints (but keep the intensity), then I could see how you could be able to do this workout more frequently. So while 3 days per week of 6 to 8 30-second sprints may be too much for many people, 3 days per week of 1 to 2 15-second sprints may produce similar benefits and be more appealing to people.

Tuesday, 7 February 2012

Shocking Before and After Transformation in 5 Hours - EXPOSED!


Uploaded by on Feb 5, 2012

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This transformation is whats possible in less than 5 hours. I'm not stating anywhere in this video that supplements or programs (mentioned or not) don't work. I'm simply showing what is possible.
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