What Were The Results Of The Colorado Experiment Featuring Casey Viator?

In the fascinating Colorado Experiment featuring Casey Viator, the world of fitness was forever changed. This groundbreaking study aimed to push the limits of human potential, and its results left the world awestruck. With Viator as the subject, the experiment sought to uncover the astounding outcomes of an intense 28-day workout regimen. Prepare to be amazed as you delve into the remarkable findings that emerged from this extraordinary undertaking.


The Colorado Experiment is a well-known study conducted in the 1970s that focused on the effects of high-intensity training and nutritional intervention on muscle gain and body composition. The experiment gained significant attention due to its subject, Casey Viator, who was a young bodybuilder known for his impressive physique. This article will provide an overview of the Colorado Experiment, highlight the methodology employed, discuss the results obtained, analyze the impact and significance of the findings, compare them to other studies, and examine the long-term effects. So, let’s dive in!

Background of the Colorado Experiment

The Colorado Experiment was conducted at the Colorado State University Exercise Physiology Laboratory in 1973. The study aimed to investigate the potential of a high-intensity, short-duration training program combined with a specific dietary protocol to maximize muscle growth and enhance body composition. The experiment caught the attention of the bodybuilding community and general public due to the remarkable transformation of Casey Viator, a 21-year-old bodybuilder who was chosen as the participant.

Introduction to Casey Viator

Casey Viator, the subject of the Colorado Experiment, was a promising young bodybuilder who had already made a name for himself in the world of bodybuilding at a young age. He possessed a well-developed muscular physique. Viator became the perfect candidate for the experiment due to his exceptional genetics and existing muscle mass, which made it easier to track and assess the effects of the training program and dietary protocol on his body.


Study Design

The Colorado Experiment implemented a rigorous study design to ensure accurate and reliable results. It involved a single participant design, with Casey Viator acting as the sole subject throughout the experiment. This design allowed for detailed tracking of his progress and minimized confounding variables that could arise with multiple subjects.

Training Program and Duration

Viator followed a high-intensity training program, which involved weightlifting exercises performed to maximum effort with short rest periods. The sessions were intense but brief, lasting only 30 minutes, to induce significant muscle fatigue and stimulate muscle growth. The training was conducted three times a week for four weeks.

Dietary Protocol

To complement the high-intensity training program, Viator adhered to a specific dietary protocol aimed at optimizing his muscle growth. His diet consisted of a high-calorie intake, emphasizing protein consumption to support muscle recovery and synthesis. The precise details of his diet, including macronutrient ratios and calorie targets, were meticulously planned and monitored to ensure adequate nutritional support.


Muscle Gain and Body Composition

The results of the Colorado Experiment demonstrated significant improvements in muscle gain and body composition. In just four weeks, Casey Viator gained an astonishing 63 pounds of muscle mass while simultaneously losing 18 pounds of body fat. This resulted in a drastic transformation of his physique and highlighted the efficacy of the high-intensity training program and targeted dietary protocol.

Strength Improvement

In addition to the impressive muscle gains, Viator also experienced substantial improvements in strength. Throughout the four-week duration of the experiment, he demonstrated remarkable increases in his ability to lift heavier weights and perform more repetitions. This strength improvement further emphasized the effectiveness of the high-intensity training program in enhancing muscular performance.

Training Efficiency

One notable result of the Colorado Experiment was the revelation of the time efficiency of the high-intensity training program. By utilizing short-duration, intense workouts, Viator was able to achieve remarkable results in a relatively short period. This finding challenged the traditional belief that long hours of training were necessary for significant muscle growth and demonstrated the potential of more focused and intense training methods.

Metabolic Changes

The metabolic changes observed during the Colorado Experiment also showcased the impact of the training program and dietary protocol on Viator’s body. The high-intensity training, combined with the specific nutrition plan, led to favorable alterations in Viator’s metabolic rate, increasing his metabolic efficiency and enabling him to burn fat while simultaneously building muscle.

Impact and Significance

Relevance to Bodybuilding

The results of the Colorado Experiment have had a lasting impact on the field of bodybuilding. This study demonstrated the incredible potential of high-intensity training and targeted nutrition in optimizing muscle growth and enhancing body composition. The findings offered an alternative approach to traditional bodybuilding techniques, showcasing the effectiveness of shorter, intense workouts combined with precise dietary interventions.

Criticism and Controversy

Like any significant scientific study, the Colorado Experiment faced its fair share of criticism and controversy. Some experts questioned the validity of the results due to the single subject design and the reliance on a genetically gifted participant like Casey Viator. Others argued that the extreme nature of the training program and dietary protocol may not be sustainable or suitable for the general population. Despite these criticisms, the experiment’s results sparked interest and further research into high-intensity training and nutrition for muscle gain.

Comparison to Other Studies

Previous Bodybuilding Experiments

Prior bodybuilding experiments had focused on different training methodologies and dietary approaches. The Colorado Experiment provided a unique perspective by incorporating high-intensity training with specific nutritional interventions. Comparisons with previous studies highlighted the superior gains achieved by Casey Viator, further supporting the effectiveness of the Colorado Experiment’s approach.

Alternative Training Approaches

In addition to comparing the results of the Colorado Experiment with previous bodybuilding studies, it is also essential to consider alternative training approaches. The experiment’s findings sparked interest in exploring different training methods outside of the conventional bodybuilding routines. This allowed for diversified workout programs to cater to individual preferences and goals, ultimately assisting in the development of more personalized training regimens.

Long-term Effects

Sustainability of Results

One critical aspect to consider in any exercise and dietary intervention is the sustainability of the results achieved. While the Colorado Experiment showcased remarkable transformations within a short timeframe, the long-term sustainability of the muscle gains and body composition improvements is unclear. Further research is necessary to determine if the high-intensity training program and dietary protocol can be maintained over an extended period without compromising health or performance.

Maintenance of Muscle Mass

Another aspect integral to long-term effects is the ability to maintain the muscle mass gained. While the Colorado Experiment demonstrated significant muscle gain in Casey Viator, it is essential to investigate whether those gains can be maintained without the intense training program and strict dietary protocol. Understanding the potential for long-term maintenance of muscle mass is crucial for bodybuilders and fitness enthusiasts seeking sustainable results.


The Colorado Experiment featuring Casey Viator demonstrated the remarkable potential of high-intensity training and specific nutritional interventions in achieving astonishing muscle gains and body composition improvements. The results challenged traditional bodybuilding methods and highlighted the efficiency of shorter, intense workouts combined with targeted dietary protocols. While some criticism and controversy surrounded the experiment, its impact on the field of bodybuilding cannot be denied. The findings stimulated further research and exploration of alternative training approaches, ultimately contributing to the development of more personalized and effective exercise programs. However, more extensive research is necessary to determine the long-term sustainability of the results and the maintenance of muscle mass over an extended period. The Colorado Experiment remains a significant milestone in the history of bodybuilding research, inspiring countless individuals to push their limits and explore new frontiers in physique development.