|A bigger biceps and less body fat to cover your precious gains? At least for CLA this has in fact been observed in a human study (see figure 1).|
"May improve the anabolic effect of exercise"
Usually things that "may" do just that, namely "improve the anabolic effect of exercise" end up in a pricey and useless testosterone booster.
|Check out the overview of the Intermittent Thoughts on Building Muscle and learn how testosterone, growth hormone, IGF-1, mTOR and the rest of the pack orchestrate skeletal muscle hypertrophy and why boosting your testosterone levels from mid will not translate into visible muscle gains (read more)|
If you take a look at the tables the researchers provide as part of their review and have basic mathematical and reading skills, it's not difficult to count the number of which would remotely support the notion that fish or CLA supplementation have any effects at all: It's 5 out of 9 for fish oil and 4 out of 7 for CLA. Certainly reason enough to "hypothesize" a bit.
Fish oil is good for your heart, but not for your physiqueIn the next step we need a little more than to identify those studies with the "no effect" label from the tables and take a the ones we were left with after our initial glance at the data. If we do just that the number of studies we have to look at decreases from 9 to 4 studies, as none of the fish oil studies survives the "Sniff Test", after all, neither
They probably ain't anabolic either, but could help you to stay lean on a bulk: DHA-phospholipid, as you would find them in krill vs. common fish oil supplements (learn more).
- a minimal reduction in O2 cost in the absence of effects on the endurance performance in cyclists (Peoples. 2008),
- improvements in VO2max in previously sedentary men a non-placebo-controlled study (Brilla. 1990)
- a reduced acute phase inflammatory response in a non-randomized non-placebo controlled intervention with average Joes (Ernst. 1991)
Now, what's interesting about the Guezennec study, though, is that the "beneficial" effects (a profound decrease red blood cell deformability; RCD) were hypoxia specific and could easily turn against you. After all, one of the reasons athlete "train high and compete low" (meaning they train at high altitudes with less oxygen in the air and thus hypoxic conditions to outperform the competition at sea level) is that this will increase the production of red blood cells. Now guess why that happens!? Correct! It's a result of the hemolytic effect of hypoxic training... now, what will happens if you copy the 6g /day EPA-max supplementation regimen of the 19-38 years old guys in the Guezennec study? Right, this effect will be absent. I wouldn't go so far and call this "ergolytic", but you could certainly make a point that huge amounts of EPA are - at least in this scenario - anti-ergogenic.
So what about CLA, then? Isn't that simply a fat burnerSo, if even the widely hailed fish oil has little data to support its usefulness as an ergogenic supplement for athletes and aspiring physical culturists, what about CLA, then? I mean, we all know that the benefits researchers observed in human trials were miles apart from what they had expected to happen based on previous experiments in rodents (click on the image to the right to be redirected to a study, where the CLA treated ice dropped 77% body fat and did nevertheless display statistically significant increases in endurance capacity).
Adequate dosing still remains an issue
These discrepancy in terms of the body fat reducing effects of conjugated linoleic acid supplementation, as Dilzer and Park pointed out only recently, at least in parts a result of insufficient doses:
Since the same goes for studies investigating the "anabolic" effects the abstract to Macaluso et al.'s review explicitly mentions, chances are that increases in endurance performance, as they were observed in the previously mentioned rodent study (read the full story, here), were likewise species or at least dosage specific.
"Studies with mice used diets containing
In July 2012 I wrote about what I believe is the unquestionably most impressive study on the fat burning and endurance enhancing effects of conjugated linolic acid. 77% body fat reduction - that's bordering lipodystrophy. The dosage used in this study would be roughly equivalent to 30g/day for human being and supports the notion that profound effects are only observed with amounts of CLA that have yet not been administered to humans in controlled trials (learn more)! 0.5 w/w%* CLA, which is equivalent to about 56 g CLA/day/70 kg (Malpuech-Bruger. 2004). Most human studies used CLA doses ranging between 0.7 g and 6.8 g per day, which is lower than doses used in mice." (Dilzer. 2012)
*Addendum: Anonymous pointed out correctly, that the figures in the above quotation (which is dirertly from the FT) are inconsistent. 0.5% would be only 5.6g. I guess that's a typo in the Dilzer study, because the Malpuech-Bruger study they reference says "a daily intake of 0.70 g/kg body mass was effective in mice". (Malpuech-Bruger. 2004) - sloppily as they are, they don't say that this is already in human equivalents, though. That becomes clear in the next sentence only, which says "A value of 0.70 g/kg body mass in humans would correspond to a daily intake of 56 g of CLA." (ibid.) The July 2012 study I reference under the image to the right used a HED of ~30g (learn more), so even if the exact figures are questionable, the argument obviously still holds.
Is CLA "anabolic" or at least ergogenic?
If we take a look at the 7 studies the researchers included in their review (I guess you will be hard-pressed to find more than those seven, as CLA is not exactly the typical supplement researchers use as an ergogenic), we can easily exclude three of them. In these studies that were conducted on healthy young women, trained male bodybuilders and physically active men and women, supplementation with 3g, 6g and 3.9g/day of CLA did exactly nothing.
This leaves us with a set four studies to take a closer look at - three of them report improvements in body composition, two of them also observed increases in endurance performance and a single one even found "slight increases in testosterone":
- Improvements in body composition were observed by Thom (2001), Colakoglu (2006) and Pinkonski (2006); all studies were placebo controlled and the participants were physically active or at least healthy men (only in the Thom study) and women who consumed 1.8, 3.6 and 5g of CLA per day.
While the former two studies by Tho and Colakoglu used exhaustive and medium intensity endurance programs, the study by Pinkonski et al. used a stardardized full-body workout with 12 exercises ranging from leg presses, bench and shoulder presses, to lat pull downs, biceps curls, and some core exercises. Each exercise was performed three times per week consisting of 3–4 sets of 4–10 repetitions at approximately 75–90% of one-repetition maximum (1RM).
Figure 1: Relative changes in body composition biceps and quadriceps size and strength parameters after 7 weeks of serious strength training with or without 5g of CLA per day (Pinkoski. 2006)
|Figure 2: Increases in cortisol (top) and testosterone (bottom) and respective increases in lean body mass in response to a 12-week hypertrophy oriented resistance training program (West. 2012)|
- Increases in testosterone, as Macaluso et al. observed them in 10 "physically active" male subjects (age, 27.4) in a previous study in response to 6g CLA per day, on the other hand, would probably qualify as "anabolic" if the latter had not been measure right the workouts, as part of a short 3-week study with no corresponding effects on body composition (Macaluso. 2012).
The latter should actually not come as a surprise to any seasoned SuppVersity student. After all you've learned that (1) endocrine induced changes in body composition take their time in the Intermittent Thoughts on Building Muscle, that (2) the role of testosterone levels in the normal range in the whole process is fundamentally overrated and (3) that the seminal paper by West & Phillips, on which the data in figure 2 is based, clearly refutes the notion that post-workout increases in testosterone have any impact on skeletal muscle hypertrophy.
PPAR-gamma effect, which is probably responsible for the reductions in insulin sensitivity and detoriations of the lipid metabolism that have been observed in numerous studies (only trans-10,cis-12 CLA), is probably not so much of a problem for lean, physically active people and the upside of the PPAR-gamma blockade is a reduced rate of fat storage....
Ah, you see I am diverting to the fat loss effects again. And if we are honest, the results of this review do actually only confirm that what you've read here at the SuppVersity roughly 3 months ago the combination of CLA + DHA could turn out to be a safe and effective fat burner (learn more), if we would finally see adequately doses, long(er) term supplementation trials in humans.
As ar as the "anabolic" nature of either of them, i.e. EPA + DHA or cis-9,trans-11 and trans-10,cis-12 CLA. The jury may still be out there, but the verdict is - at least in the case of regular fish oil almost certainly "not guilty", .. ah I mean, "not anabolic".
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