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The debates and discussions have been active for as long as people have exercised for the purpose of gaining muscle or strength. Higher weight / low reps or Lower weight / high reps. If your goal is to add muscular size, either will work. The questions are, do you have good joint health to lift the heavier weights (think an amount of weight that you can only lift 4 to 8 times with good form), or do you have the mental stamina to lift lighter weights (a weight you can lift 12 or more times with good for) enough repetitions to approach muscular failure. The key is to challenge the muscle enough to stimulate growth. The answer below explains the mechanism in detail.

Lifting just 30% of your maximum weight builds the exact same amount of muscle as lifting 80%.

This fact challenges decades of established gym dogma. For a long time, the standard belief was that lifting heavy weights for low repetitions (typically 4 to 8) was the primary way to build significant muscle mass, while light weights for high repetitions (15 to 30 or more) were strictly for endurance. However, modern sports science has completely rewritten this narrative.

Researchers have found that people can build the same amount of muscle volume using light weights as they can with heavy weights, provided one crucial condition is met: the set must be taken close to muscular failure.

To understand how this works, it helps to look at how the body recruits muscle fibers. When a person lifts a heavy weight, their nervous system instantly activates the largest, most powerful muscle fibers—known as high-threshold motor units—because the heavy load demands maximum force right from the first repetition. This high mechanical tension signals the muscle to grow larger to handle future stressors.

When lifting a much lighter weight, the body initially relies on smaller, slow-twitch muscle fibers that are highly fatigue-resistant. The first ten or fifteen repetitions usually feel quite easy. But as the set continues and those initial fibers begin to fatigue, the nervous system is forced to call in backups. To keep the weight moving, the body progressively recruits the larger, fast-twitch muscle fibers.

By the time a person reaches the final, grueling repetitions of a high-rep set, the internal environment of the muscle is remarkably similar to the end of a heavy, low-rep set. The high-threshold fibers are fully engaged and experiencing significant mechanical tension, alongside high levels of metabolic stress (the burning sensation caused by metabolite buildup in the tissue).

This is why studies comparing these exact loads consistently show equal muscle growth (hypertrophy) across both groups, as long as both sets end near the point where another repetition cannot be completed.

The main difference lies in specific physical adaptations. Heavy, low-rep training is significantly more effective at increasing maximal strength, as it trains the central nervous system to generate peak force efficiently. Conversely, high-rep training builds more local muscular endurance. But when it comes strictly to adding muscle size, the physiological mechanisms for growth are triggered by the intensity of the effort at the end of the set, regardless of how much weight is being moved.

https://runtothefinish.com/strength-training-for-aesthetics-vs-performance/?ml_sub=2941613892570191353&ml_sub_hash=u2u4

I've been off-line for a while and, to be honest, it's because a lot of articles I've been reading lately have not been inspiring enough for me to share them. There's a lot of fitness advice out there that is not based on science, or is taking one small study and exaggerating the significance of the findings. This is a basic article addressing designing a workout specific to your intended goals (i.e. athletic performance vs. strength vs. muscle definition vs. injury rehab, and so on). Of course, there is some overlap, but we need to define what our actual goals are, when we hit the gym and then exercise accordingly. Our time is too precious to spend time and effort doing things that are not moving us toward our goals.

Strength Training for Aesthetics Vs Performance (3 Run Coaches Discuss) The difference between strength training for aesthetics vs. performance is an important part of planning your training, three coaches deep dive.

If you are new to the gym, or you are not getting the results you would like, you might see if you are making any of these common mistakes.

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I usually share articles that are aimed more at general health and functional fitness, but there has been a reasonable amount of research in recent years regarding the importance of stressing the muscles in the stretched position for maximum muscle growth. My observation in the gym is that a lot of regular lifters haven't caught on to this fact yet. Most people I see doing partial reps are doing them in the shortened muscle positions, giving them a good pump but robbing them of potential gains. If you are a regular gym goer or lift weights at home, this information may be valuable.

Beyond full ROM: 3 Lessons about stretch-mediated hypertrophy Range of motion is a simple topic, right? “Use full ROM.” I’ve written before about the many studies showing that training over a larger ROM can stimulate more growth, more strength and more flexibility.   But there’s more to it. Here are 3 lessons on common misconceptions about ROM. Long-t...

The deadlift is a phenomenal lift. It challenges most muscles in the posterior muscle chain (glutes, hamstrings, back) - challenges grip strength. It is an extremely functional lift as far as mimicking everyday tasks. To do the deadlift properly and safely, we must master the hip hinge..... once mastered, the hip hinge makes it possible to move large amounts of weight with minimal risk to the lower back.

🏋️‍♂️ Perfecting the Deadlift: Anatomy in Motion 🏋️‍♂️ We’re thrilled to showcase our revised deadlift animation, created in collaboration with fitness expert Steve Theunissen. This detailed visualization highlights the key muscles at work during one of the most fundamental strength exercises: 🔹 Key Muscles Engaged: Gluteus Maximus: Provides power for hip extension. Hamstrings: Control knee flexion and support hip movement. Quadriceps: Assist in lifting and stabilizing the legs. Erector Spinae: Maintains spinal alignment and posture. Trapezius: Supports the shoulders and stabilizes the bar. Our 3D animation captures every phase of the movement, ensuring precise anatomical accuracy and showcasing the biomechanics of a flawless deadlift. Explore how your body works during this powerful lift! #Deadlift #FitnessAnatomy #MedicalAnimation #SciePro #StrengthTraining #science #med #biomechanics #fitness #workout #muscle #pt #physio #sciart #anatomy #medstudent #animation #vray #autodesk #3d

My son has been doing cold plunges for a while now, and is very happy with overall mood and seeming health benefits. If you have heard about the benefits, but are not ready to take the "PLUNGE", perhaps something as simple as a cold shower would be a good place to start.

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Something I share with all of my new clients..... This particular version is a quote from Jillian Michaels' book "The 6 Keys". "To embark on any journey that will require effort and sacrifice, you must have a "WHY" that is meaningful to you."

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8 Lesser Known (and less researched) benefits of strength training.

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Nutrient Timing is the research around how important it is WHEN you eat, not just WHAT you eat. This is focused around exercise that is either very intense or of a long duration. There are conflicting studies out there, but the comments in this article have been supported by a variety of studies and papers. Again the advice in here is not for everyday nutrition but focused on nutrition related to specific types of exercise. And, if weight loss is a goal, you still want to apply these ideas with the added task of maintaining a caloric deficit (you must burn more calories than you consume). Just FOOD for thought.

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Working with women, it still surprises me how many of them are a bit afraid of working with weights.

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Getting older doesn't necessarily mean getting "OLD." Take a look at this recent research on strength gains in older adults who choose to do resistance exercises (weight lifting).

MUSCLE MASS AND STRENGTH GAINS FOLLOWING RESISTANCE EXERCISE TRAINING IN OLDER ADULTS 65–75 YEARS AND OLDER ADULTS ABOVE 85 YEARS
Marzuca-Nassr GN, Alegría-Molina A, SanMartín-Calísto Y, et al. Muscle mass and strength gains following resistance exercise training in older adults 65–75 years and older adults above 85 years. International Journal of Sport Nutrition and Exercise Metabolism. Published online 2023:1-9.

At Barbell Rehab, a main goal is to reduce barriers to get more folks involved in strength training and aerobic training to help meet the WHO physical activity guidelines. Meeting these guidelines is one of the best ways to mitigate lifestyle induced chronic disease. Additionally, improved fitness levels appear to help us “age gracefully” as we get older. As we age, we see an
overall decline in function, although beginning with higher levels of fitness does seem to help flatten the curve compared to lesser fit counterparts (similarly to seeing folks with greater bone mineral density early on in life don’t lose it as quickly later in life as folks who started with less). This should serve as a great motivator to maximize fitness as soon as possible. But, similar to smoking, a lot of folks have a bias to assuming it’s “too late” at some point (PSA: smoking research suggests there are always benefits to stopping at any age). With exercise, there have been mixed findings regarding older adults’ adaptations to strength training after the age of 85+. In this study, the authors set out to compare the impact of resistance exercise training (RET) on muscle mass and function in healthy older adults 65–75 years versus older adults above 85 years.
To do this, the authors took 29 healthy, community dwelling older adults and split them into two groups (OLDER 65-75 n=17 and OLDER 85+ n=12). Participants in each group went through a progressive 12-week resistance training program 3x/week. Each training session began with a 5-minute warm up on a bike and general arm movements followed by one warm-up and four working sets (10 repetitions/set) of leg press and leg extension machine and then two sets of chest press, lat pull downs and horizontal row machines, followed by a five-minute cooldown with global stretching exercises. The authors increased the workload from 60-80% 1RM during the first 6 weeks and then reassessed 1RM over the last 6 weeks to adjust workloads back to 60-80% 1RM accordingly.
Testing included quadriceps and lumbar spine vertebra 3 muscle cross-sectional area (CSA via computed tomography scan), whole-body lean mass (dual-energy X-ray absorptiometry scan), strength (one-repetition maximum test), and physical performance (timed up and go and short physical performance battery) which was performed at baseline, 6 week point of training and 12 week point of training. Twelve week follow up testing showed a 10% ± 4% and 11% ± 5% increase in quadriceps cross-sectional area, a 2% ± 3% and 2% ± 3% increase in whole-body lean mass, and a 38% ± 20% and 46% ± 14% increase in one-repetition maximum leg extension strength in the OLDER 65–75 and OLDER 85+ groups with no differences in RET responses between groups. The authors also saw improvements in physical performance on the short physical performance battery and timed up and go with no differences between groups.
This is pretty incredible when you consider both groups, but the 85+ group in particular, were able to increase their 1RM leg extension strength 46% (with similar improvements for chest press, lat pull down, horizontal row and grip strength) and quad CSA 11% on average in just 12 weeks! Both groups also showed similar improvements in IL-10 inflammatory concentrations at the end of the program. The authors state, “These findings clearly show that such an advanced age per se does not limit the adaptive response to resistance exercise training” and attribute the larger effects in this trial compared to others due to a higher intensity, volume and frequency in this training program. They push back on traditional narratives by stating, “At a more advanced age, people are generally recommended to partake in low-intensity physical activities (such as easy walking, swimming, or dancing). Without detracting from the benefits of these exercise modalities, for example, cardiovascular health and overall well-being, when the aim is to increase skeletal muscle mass and strength, resistance exercise training with
moderate to high workload intensity (60%–80% 1RM) should be pursued.” So there we have it, evidence that the adaptive response to resistance training is still persevered, even in older clients/patients 85+ (who are cleared for exercise, see exclusion criteria for specifics), which should motivate us to encourage and facilitate progressive overload in the aging population to optimize fitness and assist in graceful aging.

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