Showing posts with label size. Show all posts
Showing posts with label size. Show all posts

Friday, April 29, 2016

Study Comparing Whey Pea Protein Finds Superior Gains in Sleeve Size W Pea But the Results May be Misleading

One study wouldnt be enough to prove that pea is superior to whey as muscle builder, anyways.
In a recent study, French scientist investigated the effects of two types of protein supplementation on muscle thickness and strength in 161 moderate physically active (2–6 hours per week) male participants (mean age 22 years). More specifically, the scientists compared the effects of vegetable Pea protein (NUTRALYS®) vs. Whey protein and Placebo on biceps brachii muscle thickness and strength after a 12-week resistance training program. And as the headline already reveals: The pea protein had the upper hand, when it comes to biceps brachii size, but the way the gains were measured and superior strength gains in the whey group raise questions about whether the results of this study are practically relevant - meaning you have to switch from whey to pea.
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These values are based on measurements of arm circumference of the right arm which were taken using a constant tension tape during maximal elbow extension at rest and during a maximal voluntary contraction (with maximal elbow flexion).
Figure 1: Overview of the study design.
"All subjects followed the same training routine, three times per week with a rest day between each session. Training was based on three exercises involving the elbow flexor and extensor muscles. The exercises soliciting the flexor muscles were arm curl and lateral pulldown. In the arm curl exercise, subjects sat with weights in their hands with a ~40° trunk/arm angle. They had to flex/extend the forearm over the arm. For the lateral pull-down, subjects sat with a bar in their hands above the head. They had to flex/extend the forearm over the arm with a vertical movement. The exercise soliciting the extensors was the bench press. Subjects were lying on their backs with a bar in their hands with a 90° trunk/arm angle, arms extended, and had to flex and extend their upper limbs vertically. Throughout the training program, the number of sets was progressively increased from 2 to 5 while the number of repetitions was reduced in parallel from 15 to 5 repetitions maximum (RM). In the final week, the subjects did three sets of 5 RM in order to preclude any fatigue for the D84 tests" (Babault. 2015).
Recovery between sets was identical for all workouts: 2–3 minutes. The load used for each exercise was regularly adapted during training depending on individuals’ maximum load (1-RM, one maximum repetition, evaluated every two weeks).
Pea protein (PE) is similarly satiating as whey (WH) (Lang. 1998).
Dont get me wrong: The fact that I put a huge "?" behind the assumption that pea protein was a better muscle builder than whey does not mean that I would go back on previous recommendation to use pea proteins if you dont want to use dairy protein supplements like whey or casein. They have a high amount of EAA and BCAAs and various of proven health benefits ranging from anti-inflammatory effects (albeit of yellow pea hydrolysate | Ndiaye. 2012) over similar gluco-regulatory effects as whey protein (Smith. 2012) to lipid reducing effects that have been confirmed in both rodent and human studies (Sirtori. 2012).
Figure 2: Muscle thickness in the 3 groups at baseline after 42 and 84 days. There was only a trend (£) for increased gains in the pea protein group (Babault. 2015).
Three measurements were made (at rest and contracted) along the length of the biceps, namely ¼, ½ and ¾ of the length of the upper arm (distance between the acromion process of the scapula and the lateral epicondyle of the humerus). Averaging was performed to obtain mean values for the circumference at rest and contracted.

Faulty measurements due to messed up timing?

That sounds great, but since the time of measurement is not mentioned, it may well be that all the values are fundamentally flawed. Why?

Well, as a SuppVersity reader you know that even in leg muscles, which are muss less prone to "the pump", "Cell Swelling Keeps Muscles "Pumped" For More Than 52h. Size Increases of Up to 16% After a Single Leg Workout!" (learn more).

Practically speaking, this means that the "size measurements" in the study at hand may be worthless if the scientists didnt wait for at least 72h-96h before they measured the sleeve sizes of their subjects.
Dont trust sleeve size measurements, unless you know that they were taken at least 72h after the last workout. If they are taken before, the "gains" may well be a mere result of cell swelling. You dont believe that? Well reread my article "Cell Swelling Keeps Muscles Pumped For More Than 52h. Size Increases of Up to 16% After a Single Leg Workout!" (read it).
The absence of information on the time-point at which the sleeve sizes were measured (suggestive of immediately post) and the fact that the strength gains do not reflect the alleged superiority of pea protein as muscle builders (see Figure 3) put a huge question mark behind the assumption that pea protein tends to produce greater muscle gains than whey.
Figure 3: It is strange that the "superior muscle builder" triggers the lowest gains in maximal isometric contractile force. Even the placebo group had greater strength gains - despite a lack of sign. differences at baseline (Babault. 2015).
Rather than "gains", the increases could in fact be a result of increased inflammation and the reduced "gains" in the whey group a result of its anti-inflammatory effects (Buckley. 2010; Sugawara. 2012; Kerasioti. 2013). The existing evidence of anti-inflammatory properties of pea protein (Ndiaye. 2012) does yet render this assumption questionable.
On paper, the amino acid profile of whey looks more anabolic (higher BCAA content).
Overall, the study clearly indicates that pea protein is a good vegan replacement for whey protein. The assumption that it may be superior to whey protein, however, is questionable. First of all, the strength gains dont reflect these changes. In fact, the whey protein group saw the largest strength increases - as it was the case for the size gains, these differences were not statistical significant, though.

If we also take into consideration that the "size" gains are actually gains in sleeve size (not reliable DXA measurements) which may have been taken way too early after the workouts to reflect actual muscle gains, we dont even have to raise the question whether the fact that the French company Roquette, the producer of NUTRALYS® pea protein, sponsored the study may have constituted an obviously subliminal bias ;-) Anyways, I would not yet replace my whey protein with pea protein isolates | Comment Facebook!
References:
  • Babault, et al. "Pea proteins oral supplementation promotes muscle thickness gains during resistance training: a double-blind, randomized, Placebo-controlled clinical trial vs. Whey protein." Journal of the International Society of Sports Nutrition 12:3 (2015).
  • Buckley, Jonathan D., et al. "Supplementation with a whey protein hydrolysate enhances recovery of muscle force-generating capacity following eccentric exercise." Journal of Science and Medicine in Sport 13.1 (2010): 178-181. 
  • Lang, Vincent, et al. "Satiating effect of proteins in healthy subjects: a comparison of egg albumin, casein, gelatin, soy protein, pea protein, and wheat gluten." The American journal of clinical nutrition 67.6 (1998): 1197-1204.
  • Ndiaye, Fatou, et al. "Anti-oxidant, anti-inflammatory and immunomodulating properties of an enzymatic protein hydrolysate from yellow field pea seeds." European journal of nutrition 51.1 (2012): 29-37.
  • Kerasioti, Efthalia, et al. "Anti-inflammatory effects of a special carbohydrate–whey protein cake after exhaustive cycling in humans." Food and Chemical Toxicology 61 (2013): 42-46.
  • Sirtori, Cesare R., et al. "Hypocholesterolaemic effects of lupin protein and pea protein/fibre combinations in moderately hypercholesterolaemic individuals." British journal of nutrition 107.08 (2012): 1176-1183.
  • Smith, Christopher E., et al. "The effect of yellow pea protein and fibre on short-term food intake, subjective appetite and glycaemic response in healthy young men." British Journal of Nutrition 108.S1 (2012): S74-S80.
  • Sugawara, Keiyu, et al. "Effect of anti-inflammatory supplementation with whey peptide and exercise therapy in patients with COPD." Respiratory medicine 106.11 (2012): 1526-1534.


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Saturday, March 26, 2016

How to adjust the Ubuntu screen size

After you install an Ubuntu operating system on your computer, you might find that the Ubuntu desktop screen size is slightly too large to display completely. For example, the toolbar at the bottom of your Ubuntu desktop might be only partially visible, if at all. The possible solutions to this problem vary according to whether you have an LCD (flat) monitor or a CRT (glass) monitor.

If you have an LCD monitor, you have two possible solutions:
  • Run "automatic configuration" to adjust the screen size on your LCD monitor.
  • Activate a proprietary video-card driver.
If you have a CRT monitor, you have two possible solutions:
  • Adjust screen size and position on a CRT monitor.
  • Activate a proprietary video-card driver.
Running Automatic Configuration
Only an LCD monitor has an automatic-configuration button. Therefore, if you have a CRT monitor, you cannot run automatic configuration. To adjust the screen size on your LCD monitor through automatic configuration, do the following:
  1. Locate the automatic-configuration button. See the instructions that came with your LCD monitor.
  2. Press and release the automatic-configuration button to run automatic configuration and adjust screen size.
Activating a Proprietary Video-Card Driver
To activate a proprietary driver for your video card (or the built-in "video-card" circuitry on your motherboard), do the following:
  1. At the top of the Ubuntu desktop, click on System to display its drop-down menu.
  2. Select Administration to display its drop-down menu.
  3. Click on Hardware Drivers to first display a "Searching for available drivers window," and then after approximately 20 seconds, display a "Hardware Drivers" window.
  4. If the Hardware Drivers window lists only one proprietary video driver, select it to activate it. If the list contains more than one proprietary video driver, select the recommended (or newest) driver to activate it.
Adjusting Screen Size and Position
Only a CRT monitor has both "size" and "position" adjustment knobs. Therefore, if you have an LCD monitor, you cannot adjust screen size. To adjust screen size and position on a CRT monitor, do the following:
  1. Locate the horizontal-size, horizontal-position, vertical-size, and vertical-position adjustment knobs. You can usually find these knobs at the back, or under a cover at the front.
  2. Adjust the horizontal-size knob until you see a black stripe at either the left or right of the screen.
  3. Adjust the horizontal-position knob until you see identical black stripes at both sides of the screen.
  4. Repeat steps 2 and 3 until you see only thin, identical black stripes at both sides of the screen.
  5. Adjust the vertical-size knob until you see a black stripe at either the top or bottom of the screen.
  6. Adjust the vertical-position knob until you see identical black stripes at both the top and bottom of the screen.
  7. Repeat steps 5 and 6 until you see only thin, identical black stripes at both the top and bottom of the screen.


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Wednesday, March 16, 2016

Cut the Volume Still Make Gains! Performance Gains in Sprinters Dont Suffer From Reduced Training Volume Plus Best Volume Frequency for Size Strength Gains

A personal trainer who knows what hes doing is that he will push you exactly so far as it is necessary to make maximal progress. Interestingly, even the best trainers will fail doing the same for themselves.
The more is better mentality thats so characteristic of our lives in the Western world of affluence is imho the most important obstacle trainees all around the world meet on their way to increased muscle strength, size and performance. Against that background its a pity that the results of a recent study from the School of Kinesiology and Health Studies at the Queen’s University relate to sprint training, only. So, after having a look at Jason G. E. Zelt, I will briefly take a look at similar evidence from the more popular field of "working out to look good naked" and to be as strong as Superman.

But lets not waste any more time and sprint straight to the point! Zelt et al. published the results of the initially mentioned study in the peer-reviewed European Journal of Applied Physiology (Zelt. 2014).
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As Zelt et al. point out, the purpose of this study was twofold: (1) to confirm that reductions in SIT work-interval duration do not result in reduced adaptations in aerobic and anaerobic capacity, and (2) to examine the effects of reduced work interval duration on submaximal determinants of exercise performance, namely lactate threshold and critical power.

In accordance with previous studies where aerobic capacity and aerobic performance were measured (Burgomaster. 2008; Hazell. 2010), the scientists hypothesized that reducing SIT work interval duration would have no effect on training-induced increases in lactate threshold and critical power.
Figure 1: Effects of high (SIT30) and lower volume (SIT15) training on power output and lactate threshold (Zelt. 2014)
And indeed, it hadnt. While there was a significant main effectof training on VO2peak such that VO2peak was elevated post-training, no significant difference was observed in the improvements observed between groups (ET ~13 %, SIT 30–4 %, SIT 15–8 %; not shown in Figure 1).
"A significant main effect of training was observed such that lactate threshold and critical power were higher during post-testing across all groups (p  <  0.05). There was a main effect of training (p  <  0.05) on Wingate peak power with no differences observed between groups at post training."
As the researchers point out, these results clearly indicate that "reducing SIT work-interval duration from 30 to 15 s had no impact on training-induced increases in aerobic or anaerobic power, or on increases in lactate threshold (absolute) and critical power."
Practically speaking, the results of this study imply it does not matter if you decrease the total volume on your sprint by 50%; and its not unlikely that this goes for other sports that require explosive strength, as well.
The initially hinted at question that remains is yet: "Is this true for the more popular training goal of getting strong, ripped and buffed, as well?" The answer to this question is certainly not easy to answer, as it may easily depend on your training status, your exact goals and maybe even the body parts youre training. You dont get it? Well, I guess its best Ill provide you with a few examples:
  • Look at his legs, Ronnie Coleman must have done something right... and guess what, the study at hand suggests that part of it could have been his insane training volume.
    the legs of advanced trainees may need a little more hammering -- Maybe you remember this being the take-home message from a previous article, i.e. "Advanced Trainees Benefit from Increased Training Volume! Greater & Steadier Strength Gains with 8 Sets of Squats. Plus: Over 6 Weeks, 1 Set and 4 Sets Equally (In-)Effective." | read more
  • the classic single vs. three set debate is still not settled -- While Starky et al.s 1996 study is one of the studies that appears to tip the scale in favor of studies suggests that there is no significant different in the strength and muscle gains in response to increasing the number of sets on a given exercise from one to three sets. Unfortunately, Starky et al. as well as most of their successors picked untrained noobs to test their hypothesis. And we all know: Noobs grow from simply looking at a barbell, right?

    So what do other studies say? Studies that used subjects like you and me? People who have been training regularly for ten or more years? People like the fifty-one experienced (>3 years), trained junior lifters who were randomly assigned to low, medium and high volume resistance training in a 2005 study by Juan J. Gonzalez-Badillo et al.
    Figure 2: Number of repetitions per week and average intensity (AI) during the 10-week training period in the low-volume (LVG), moderate-volume (MVG), and high-volume (HVG) training groups (left); EEffect size for the snatch, clean & jerk, and squat performances. LVG low volume group; MVG medium volume group; HVG high volume group (Gonzalez-Badillo. 2005)
    As you can see in Figure 2 (right), there is a highly significant advantage of the medium vs. both the low and high volume group who trained at significantly lower, respectively higher volumes (see Figure 2, left) than the guys in the medium volume group for squats and clean & jerks. The snatch, on the other hand, probably because it is the most demanding exercise, technically speaking, benefited from a "little" more volume (~ 100 reps per week).
  • the lower the volume, the higher the frequency -- Furthermore, the overview in Table 1, which was originally published as part of a review of the determinants of strength training success by Tan (1999) shows that another volume-related parameter, i.e. the training frequency, figures, as well; with high(er) frequencies producing greater increases in strength gains.
    Table 1: Summary of studies looking into optimal training frequency (Tan. 1999)
    Up to five training sessions for the upper and up to four for the lower body are possible, but whether theyre in fact as productive as the studies Tan cites would suggest appears questionable and will certainly depend on the volume of the individual sessions.

    The fact that it seems as if the upper body would respond more favorably to increases in training frequency than the lower body would albeit stand in line with the previously cited beneficial effects of high(er) volume training on the legs.

    Figure 3: Generally speaking a 2007 review of the literature by Mathias Wernbom et al. supports the notion that legs (in this case the quadriceps) dont just gain the most strength, but also the most size with ~3 training sessions per week; with the one outlier (12x/week) being a low intensity Kaatsu study by Abe et al. (2005)
    Why? Well, the study by Robins et al. conducted in 2012 (learn more) used a high volume on training days, but a necessarily low training frequency (two session per week, A + B). As Tan points out, ...
    "[...a]nother point to note from Table 1 is that previously trained athletes are closer to their strength potential and may require higher frequencies compared with untrained athletes" (Tan. 1999)."
    A statement that takes us back to the simple, but significant assessment that we cannot expect to find a training volume thats perfect for everyone: Individualization is key!
As far as the design of specific routines is concerned the previously cited review by Wernborn et al. offers a neat overview of suggested training principles, most of you will be familiar with.
Table 2: Recommendations for dynamic external resistance training for hypertrophy (Wernborn. 2007)
If you take a look at the middle column, you will hopefully realize that the suggested progression from 1-2 sets to 3-6 sets is specified on a "per muscle group" basis. The three biceps exercise with three sets of 8-12 reps, each, are thus off the charts, already; and youd be better off doing three sets of barbell curls and nosebreakers to end up at your maximum of six sets per body part (in this case the "arms") to return to the gym two days later and hammer your arms with three sets of hammer curls and cable press-downs.
The false believe that more helps more is also at the heart of the not exclusively female athletes triad.
Bottom line: I guess we all tend to do way more than wed need to, to achieve optimal results. Against that background its good to be reminded from time to time that "less can be more", as long as we do it frequently and consistently.

As my elaborations have shown, the latter is true for both the athletic / performance oriented, as well as the physique related outcome of any form of training. In the "best case" youre just wasting your time, as the sprint trainers in the study by Zelt et al. In the worst case, on the other hand, you end up in the deep dark black hole I wrote about in the athlete triad series a couple of months ago - a hole from which you can only escape by accepting the negative consequences of detraining and resting for a couple of weeks before you can resume your training slowly.
References:
  • Abe, Takashi, Charles F. Kearns, and Yoshiaki Sato. "Muscle size and strength are increased following walk training with restricted venous blood flow from the leg muscle, Kaatsu-walk training." Journal of Applied Physiology 100.5 (2006): 1460-1466.
  • Robbins, Daniel W., Paul WM Marshall, and Megan McEwen. "The effect of training volume on lower-body strength." The Journal of Strength & Conditioning Research 26.1 (2012): 34-39.
  • Tan, Benedict. "Manipulating resistance training program variables to optimize maximum strength in men: a review." The Journal of Strength & Conditioning Research 13.3 (1999): 289-304.
  • Wernbom, Mathias, Jesper Augustsson, and Roland Thomeé. "The influence of frequency, intensity, volume and mode of strength training on whole muscle cross-sectional area in humans." Sports Medicine 37.3 (2007): 225-264.
  • Zelt, Jason GE, et al. "Reducing the volume of sprint interval training does not diminish maximal and submaximal performance gains in healthy men." European journal of applied physiology (2014): 1-10.


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Sunday, March 13, 2016

Intensify Your Training Increase Your Gains W Combined EMG Regular Training For 30 Greater Muscle Size Gains

Voluntary & NMES contractions for Monster Quads?
You are always looking for new ways to improve your training outcome? Scientists from the Department of Physiotherapy at the University Cardenal Herrera-CEU might have something for you, then. In their latest study, V. Benavent-Caballer, P. Rosado-Calatayud, E. Segura-Ortí, J.J. Amer-Cuenca, and J.F. Lisón tried to elucidate, whether conducting low intensity resistance training in conjunction with  neuromuscular electrical stimulation (NMES) would provide not just an additional growth stimulus, but also corresponding increases in physical performance, muscle cross-sectional area (CSA) and the capacity to perform daily tasks 22 in exactly those subjects researchers will resort to, when theyre looking for generous funding for studies the outcome of which is not going to pay off in form of scripts for a new patentable drug: Older adults living in a geriatric nursing home.
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What? Yeah... I have to admit, the subjects are not exactly bodybuilders and a regular high intensity control is missing, but even if it wasnt for the necessary fact that youll belong to the group of "older adults" in 50 years from now, the results of the study at hand would still have a certain relevance for younger trainees. Why? Well, something that makes the elderly grow will certainly do the same in young people. Whether it does so at the same or even higher rates than "regular" strength training will obviously have to be elucidated in future studies.
Table 1: Subject characteristics;  VC = volitional contraction; NMES = neuromuscular electrical stimulation; NMES+ = NMES superimposed onto voluntary contraction. SD = standard deviation (Benavent-Caballer. 2014)
For now, all I can tell you is that the three weekly supervised 30-35 min exercise sessions the 89 participants of the study at hand performed in the course of this 16-week study lead to significantly more pronounced strength and size gains, when the exercise was performed using both voluntary contractions and the forced contractions, the researchers produced by attaching their subjects to the surface electrodes of a portable NMES devices (TensMed S82).
Beware of NMES only training! In as much as a combination of voluntary contractions and NMES  may make sense, you should not fall for the fallacious promises of "couch workout" advocates. Previous studies suggest that the strength increases of EMS are - just like any form of training - stimulus specific, the "incomplete muscle activation after training with electromyostimulation" will thus make your muscle stronger on the couch (during your NMES workouts), but are not necessarily going to translate into the real world (Hortobágyi. 1998).
The four adhesive surface electrodes (5 × 5 cm) were placed on the distal medial and proximal lateral portions of the subjects anterior thigh, when they performed their three sets of knee extensions (15 reps each) in a single-leg fashion with 3-minute rest between sets.
Figure 2: Changes in muscle strength (hand grup) and size (rectus femoris), as well as changes in parameters of physical functioning in response to the three training modalities (Benavent-Caballer. 2014)
The participants were instructed to raise the weight in 1 s (concentric phase), keep a full knee extension for 3 s (isometric phase) and slowly lower the weight in 2 s to the starting position (eccentric phase). Each contraction was followed by a 2-second rest period, and the training intensity was set at 40% of 1RM... and yeas, this sounds pretty much like peak contractions, an intensity technique which may in fact be the reason that the old trainees in the study at hand recorded highly significant increases in muscle size even when the peak contraction or rather the whole movement was not superimposed with NMES which was delivered with a ramp-up time of 1 s increasing intensity as the knee was extended from 90° to full extension that was followed by 3 s keeping the knee in full extension and 2 s of a ramp-down with gradually decreasing intensity (see Figure 2, yellow).
There is evidence from previous studies that a similar NEMS + VC regimen leads to non-significantly higher strength gains in the trained leg and sign. higher cross-education effects in the untrained leg of young men (Bezerra. 2009)
Bottom line: It is, as mentioned before, difficult to predict whether or not the NEMS+ training would produce superior training outcomes in younger athletes, athletes. It is yet almost certain that the combination of NEMS + voluntary contractions would pose a viable tool in the toolbox of any injured athlete who has to cut back on his / her training intensity for health reasons.

Moreover, previous trials in younger subjects confirmed that superimposing NEMS + voluntary contractions is at least on par with classic high intensity resistance training and can promote neural adaptations that lead to increased cross-education effects (strength gains in non-trained leg) in a 2009 study by Bezerra et al. (2009).

Beneficial effects of combining (N)EMS and voluntary contractions (not always superimposed, though) were also reported by Venable et al. (1991) and Dervisevic et al. (2002) for resistance training, Pichon et al. (1995) for swimming, Maffiuletti et al. () for basektball volleyball, Brocherie et al. (2005) for ice-hockey and Herrero et al (2006), Babault et al. (2007) and Paillard et al. (2008) for physical education (vertical jump, strength, etc. tested) | Comment on Facebook!
References:
  • Babault N, Cometti G, Bernardin M, et al. "Effects of electromy ostimulation training on muscle strength and power of elite rugby players." J Strength Cond Res 21 (2007): 431-7.
  • Bezerra, Pedro, et al. "Effects of unilateral electromyostimulation superimposed on voluntary training on strength and cross?sectional area." Muscle & nerve 40.3 (2009): 430-437.
  • Brocherie F, Babault N, Cometti G, et al. "Electromyostimulation training effects on the physical performance on ice hockey players." Med Sci Sports Exerc 37 (2005): 455-60.
  • Delitto A, Brown M, Strube MJ, et al." Electrical stimulation of quadriceps femoris in an elite weight lifter: a single subject experiment." Int J Sports Med 10 (1989): 187-91.
  • Dervisevic E, Bilban M, Valencic V." The influence of low-frequency electrostimulation and isokinetic training on the maximal strength of m. quadriceps femoris." Isokinet Exerc Sci 10 (2002): 203-9. 
  • Hortobágyi, Tibor, Jean Lambert, and Kevin Scott. "Incomplete muscle activation after training with electromyostimulation." Canadian journal of applied physiology 23.3 (1998): 261-270. 
  • Maffiuletti NA, Cometti G, Amiridis IG, et al. "The effects of electromyostimulation training and basket practice on muscle strength and jumping ability. Int J Sports Med 21 (2000): 437-
    43. 
  • Malatesta D, Cattaneo F, Dugnani S, et al. "Effects of electromyostimulation training and volley practice on jumping abilities." J Strength Cond Res 17 (2003): 573-9.
  • Herrero JA, Izquierdo M, Maffiuletti N, et al. "Electromyostimu lation and plyometric training effects on jumping and sprint time." Int J Sports Med 27 (2006): 533-9.
  • Paillard, Thierry, et al. "Effects of two types of neuromuscular electrical stimulation training on vertical jump performance." The Journal of Strength & Conditioning Research 22.4 (2008): 1273-1278.
  • Pichon F, Chatard JC, Martin A, et al. "Electrical stimulation and swimming performance." Med Sci Sports Exerc 27 (1995): 1671-6.
  • Venable MP, Collins MA, O’Bryant HS, et al. "Effect of supplemental electrical stimulation on the development of strength, vertical jump performance and power." J Appl Sport Sci Res 5 (1991): 139-43


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Muscle Mass Strength from the Convenient Outlet Study Proves Neuromuscular Electrical Stimulation Can Increase Muscle Size Strength

NEMS devices are usually marketed as "ab trainers" - do you own one?
Convenience above everything! Although I personally believe that this mantra is to blame for most of the modern health issues, scientists from the Department of Biomedical Engineering and Institute for Convergence Study of Bio-Medical Wellness at the Yonsei University in Korea have now been able to demonstrate that you can counter part of the negative side effects of our post-modern convenience culture quite conveniently.

Plug an NMES device into your convenient outlet, attach it to your biceps, sit down conveniently in front of your television screen and have the device train your muscles.
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"Go Heavy, or go home!?" Bro- or proscience?

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You dont believe that this works? Well, basically this is what the seven healthy male subjects who were recruited for the study did at the laboratory. The participants were trained two times per week (three subjects: Mondays and Thursdays; and four subjects: Tuesdays and Fridays) for 12 weeks. Each exercise session was performed for 30 min with no rest interval.
You could do this in front of your TV at home (image from Son. 2014)
"During the training, the subject was required to maintain a shoulder joint angle of 90° in the sagittal plane. The electrical stimulation (pulse width: 200?s; and frequency: 20 Hz (Dreibati et al., 2010)) was delivered through a pair of 5 × 5 cm gelcoated electrodes attached to the region of the biceps brachii muscle belly. The magnitude of the stimulation was determined as the subjects maximum comfortable current level, but no more than 80 mA, with complete elbowflexion from the fully extended state; the mean value was 57.00 (SD 4.28) mA." (Son. 2014)
I am not sure if this hurts, but based on my experience with a friends NMES ab trainer, I suppose it did... not convenient, ok, but still better than actually moving for most of the the members of the convenience generation, Id guess - And I mean, you cant argue with results, right?
Figure 1: Maximal force and muscle thickness before and after the NMES training (Son. 2014)
I must admit I was quite impressed with the 8% increase in muscle size and the 23% increase in performance. Ok, the study doesnt tell us anything about the training experience of the subjects, but even if they were noobs thats more than Id expected to see from two weekly sessions of NMES.
Figure 2: The training did not work for all participants (Son. 2014)
Bottom line: I am pretty sure there is a limit to the application of EMS as a means to increase muscle size & strength. Nevertheless two EMS sessions per week appear to be better than spending the same time on the sofa watching TV without an EMS device contracting your biceps and whatnot.

That being said, physical culturists like yourself probably benefit very little from EMS, unless you intend to stop training, these devices are probably useful only as an adjunct for those who would otherwise fry their nervous system by doing 100 sets of curls everyday... I mean, no voluntary contraction, no CNS overload; but honestly, I suspect that one or two days of full rest would be the better choice for anyone who fits into the "training junkie" category described, here.
Reference:
  • Jongsang Son, Dongyeop Lee, Youngho Kim, Effects of involuntary eccentric contraction training by neuromuscular electrical stimulation on the enhancement of muscle strength, Clinical Biomechanics, Available online 10 June 2014.


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