What is the recommended dosage for fish oil for general health?

For general health and wellness, aiming for 0.3 to 0.5 grams per day of combined EPA and DHA is often recommended. Higher doses, up to 1-2 grams daily, are considered reasonable, but evidence for benefits beyond that for fitness goals is unclear.

Can fish oil help with muscle growth (hypertrophy)?

Systematic reviews suggest that omega-3 fatty acids may have positive effects on muscle protein processes in untrained individuals. However, when combined with exercise training, these reviews did not find improvements in hypertrophy or muscle strength, indicating limited benefits for muscle growth in trained individuals.

What did the sports psychology review find about performance?

A systematic review of meta-analyses in sports psychology found that psychological variables theorized to improve performance generally do, with a medium effect size. Mindfulness interventions showed the largest positive effect, while negative mood disturbances were associated with poorer performance.

What is body fat set point theory, and what are its limitations?

Classical set point theory suggests the body defends a specific body fat level. However, it's criticized for overemphasizing biology and ignoring psychological and environmental factors that influence body weight, especially when considering population-level shifts in obesity rates.

What are alternative models for body weight regulation?

Alternative models include the settling point model (emphasizing passive feedback between body size and energy expenditure) and, more comprehensively, the general model of intake regulation and the dual intervention point model, which incorporate both physiological feedback and environmental/behavioral factors.

Why might training at longer muscle lengths lead to more hypertrophy?

Potential mechanisms include increased mechanical tension (enhancing mechanotransduction), greater muscle deoxygenation, effects of local autocrine/paracrine signaling (like IGF-1), and redistributing stress to previously under-trained distal regions of the muscle.

Could 'micro-workouts' help build muscle?

Conceptually, yes. Consistent exposure to some degree of loading throughout the day, similar to manual laborers, could stimulate muscle growth. However, research directly supporting 10+ small daily workouts is lacking, and gradual progression is advised to prevent injury.

Is there a maximum number of effective sets per training session?

Research suggests that 6-8 sets per muscle group per session is a reasonable starting point on average, providing most of the benefits. However, this can be higher if training sessions are further from failure, and individual tolerance and response vary significantly.

Are seed oils unhealthy?

Concerns about seed oils often stem from their unsaturated bonds being prone to oxidation and correlations with increased health issues over decades. However, comprehensive reviews of human data suggest that in the context of an otherwise healthy diet, seed oils do not clearly lead to deleterious outcomes and may not be as harmful as commonly claimed.

Key Moments

Fish Oil, Body-Fat Set Points, and Junk Volume (Episode 76)

Stronger By Science

Sports5 min read72 min video

Mar 3, 2022|8,489 views|272|50

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Key Moments

TL;DR

Fish oil's benefits for recovery are inconsistent; body fat set point theory is debated; micro-workouts and junk volume have practical considerations.

Key Insights

Fish oil supplementation shows inconsistent benefits for muscle recovery, with high doses potentially needed, but evidence is mixed.

The classical body fat set point theory is challenged by newer models like the dual intervention point model, which better account for physiological and environmental factors.

Training muscles at longer lengths may enhance hypertrophy through increased tension, muscle deoxygenation, local hormonal responses, and better stimulation of distal muscle regions.

Micro-workouts, involving frequent, short bouts of exercise throughout the day, might contribute to muscle building, though direct research is limited and gradual progression is advised.

Excessive training volume within a single session ('junk volume') likely leads to diminishing returns, with 6-8 sets per muscle group being a reasonable starting point, adjustable based on proximity to failure and individual tolerance.

Concerns about 'seed oils' are often based on theoretical oxidation risks and correlations, with limited direct evidence from human studies showing harm when incorporated into a balanced diet.

FISH OIL AND MUSCLE RECOVERY/COMPOSITION

The podcast explored the efficacy of fish oil (EPA and DHA) for recovery and body composition. Mechanistically, anti-inflammatory effects and potential enhancement of muscle protein synthesis and fat oxidation have been proposed. Early studies suggested benefits for recovery at higher doses (e.g., 6g/day), but subsequent research, including a study by Visconti et al., found no significant impact on recovery outcomes even at 8g/day. A systematic review highlighted significant variability and shortcomings in existing literature, making definitive conclusions difficult. While some meta-analyses suggest acute benefits for recovery (soreness, muscle function), evidence for hypertrophy or significant fat loss is weak, especially when combined with training. Moderate daily intakes (0.3-0.5g) for general health are likely beneficial, but higher doses for performance benefits lack strong support and carry a risk of increased bleeding time.

DEBATING BODY FAT SET POINTS

The discussion critically examined the concept of body fat set points. The classical theory posits a defended body fat level with physiological feedback mechanisms to maintain it. However, this theory struggles to explain population-level increases in obesity and the influence of non-biological factors like social class or media consumption. Alternative models were presented, including the 'settling point' model, which emphasizes passive energy balance but may underemphasize physiological regulation. The 'general model of intake regulation' and the 'dual intervention point model' were highlighted as more comprehensive. These models incorporate both compensated, physiological feedback loops and uncompensated, environmental/behavioral influences, suggesting that while physiological mechanisms constrain weight change, broader factors can shift the defended range.

MECHANISMS OF HYPERTROPHY AT LONGER MUSCLE LENGTHS

The episode delved into the proposed mechanisms behind why training at longer muscle lengths might promote greater hypertrophy. Key theories include enhanced 'mechanotransduction' due to increased tension on the muscle's connective tissue, potential muscle deoxygenation under stretch which may signal growth, and localized autocrine/paracrine signaling, such as increased IGF-1 within the muscle. An additional hypothesis suggests that longer muscle lengths expose previously under-stimulated 'distal' regions of the muscle more effectively, leading to a more homogeneous hypertrophy response throughout the muscle belly compared to short-range partials which might preferentially stimulate 'proximal' regions.

THE POTENTIAL OF MICRO-WORKOUTS

The concept of 'micro-workouts'—performing multiple sets of an exercise spread throughout the day (e.g., 10 sets of 10 bicep curls daily)—was explored for muscle building. Analogies were drawn to manual laborers with well-developed forearms despite not doing traditional training, and to research showing hypertrophy from low-level stress in sedentary individuals. The idea is that consistent, low-level stimulation throughout the day might contribute positively to muscle growth, particularly for upper body muscles often less engaged in daily activities. However, direct research on such extreme micro-workout protocols is lacking, and a strong emphasis was placed on gradual progression to avoid overuse injuries.

UNDERSTANDING 'JUNK VOLUME' AND SESSION LIMITS

The question of 'junk volume'—training volume that exceeds the point of productive stimulus—was addressed. Current recommendations suggest that 6-8 sets per muscle group per session is a reasonable starting point for achieving most of the potential hypertrophy benefits from a single workout. This recommendation assumes training close to failure. If sets are performed further from failure, higher volumes might be tolerated. Crucially, individual responses vary significantly; some individuals may benefit from more volume, while others might see diminishing returns or negative effects at that average threshold. Therefore, general recommendations should serve as a starting point for personal experimentation and adjustment.

SPORTS PSYCHOLOGY RESEARCH LANDSCAPE

A systematic review of meta-analyses in sports psychology was highlighted as a valuable resource. The review indicated that the field generally has strong evidentiary grounds, with psychological variables and interventions associated with performance showing medium positive effects (d ≈ 0.5) and negative factors showing small negative effects (d ≈ -0.21). Mindfulness interventions showed the largest positive effect, while negative mood disturbances showed the largest negative effect. Weaknesses identified in the literature include a heavy reliance on cross-sectional studies (limiting causal inference) and inadequate control groups (failing to account for expectancy effects). A lack of clearly proposed underlying mechanisms for many findings was also noted, suggesting room for deeper research.

REVISITING THE SEED OIL CONTROVERSY

The episode briefly touched upon the recent online discourse surrounding 'seed oils.' Concerns primarily revolve around the high degree of unsaturated fatty acids being prone to oxidation and potential implications for inflammation and cardiovascular health, or correlations with rising health issues. The presenters noted that these arguments often lack robust human evidence and are sometimes based on theoretical risks or broad correlations. A resource was recommended that offers a comprehensive rebuttal to common anti-seed oil claims, suggesting that for individuals consuming a balanced diet, the evidence supporting significant harm from seed oils incorporated into their diet is weak.

Mentioned in This Episode

●Supplements

●Software & Apps

●Companies

●Organizations

●Books

●Studies Cited

●People Referenced

Training Volume and Intensity Guidelines

Practical takeaways from this episode

Do This

Consider 6-8 sets per muscle group per session as a starting point if training close to failure.

Increase per-session set volume if training further from failure.

Individualize your training volume based on your response and recovery, as optimal volume varies significantly.

Ease into micro-workouts to avoid overuse injuries, gradually increasing volume or intensity.

Seek out EPA and DHA in your diet for general health benefits, aiming for 0.3-0.5 grams daily on average.

Avoid This

Do not assume a 'one-size-fits-all' approach to training volume; personalize it.

Avoid jumping into high-volume micro-workouts without gradual adaptation.

Do not expect fish oil to be a potent anabolic ingredient for muscle growth or significant fat loss.

Be aware that high doses of fish oil can increase bleeding time; inform your medical team if undergoing surgery.

Common Questions

While there's mechanistic evidence suggesting anti-inflammatory effects that could aid recovery and potential alterations in fat oxidation, studies show mixed results. Some research indicates an acute benefit for reducing soreness and improving muscle function, but evidence for significant hypertrophy or fat loss is weak.

Topics

Muscle Recovery Body Weight Regulation Set Point Theory Settling Point Model Muscle Hypertrophy Mechanisms Micro-Workouts

Mentioned in this video

studyDu et al.

A meta-analysis on the effects of fish oil on weight loss, which found no significant effect.

studyLopez-Sayans et al.

Authors of two systematic reviews discussing the effects of fish oil on hypertrophy and strength outcomes.

personKubo and Tanamoto

Japanese researchers who have studied the impact of muscle deoxygenation on hypertrophy signaling.

softwareNutrivore.com

A website linked by the host as a resource for a rebuttal to common concerns about seed oils.

studyVan Dusseldorp et al.

A study reviewed by Eric Trexler that suggested 6 grams of fish oil per day might improve recovery outcomes.

organizationPLOS

An open-access scientific journal publisher where the sports psychology review was published.

personb-health performance

Reddit user who asked about mechanisms for hypertrophy at longer muscle lengths.

studyAnthony et al.

A systematic review by Anthony and colleagues that highlighted inconsistencies and shortcomings in fish oil research regarding eccentric exercise.

personJohn Speakman

Researcher in metabolism whose work on body weight regulation models was cited, including the paper 'Set points, settling points and some alternative models'.

personAthena D'eon

Facebook user who asked about the effectiveness of micro-workouts for muscle building.

studyVisconti et al.

A 2021 study that replicated aspects of the Van Dusseldorp study but found no significant recovery improvements with 6 or 8 grams of fish oil daily.

studyLocke, Baum, et al.

Authors of a systematic review of meta-analyses in sports psychology, finding generally positive effects for performance-enhancing psychological variables.

studyScarpelli et al.

A 2020 study investigating how previous resistance training volume affects muscle hypertrophy response in trained individuals.

personKim Josephson

Facebook user who asked about maximum sets per session for a body part and junk volume.