Uploaded October 2022 | Updated September 2026, 1 day ago
Mechanical tension, muscle damage, and metabolic stress are often viewed as the key stimuli for muscle hypertrophy. A new study asserts that mechanical activation of fast-twitch muscle fibers is the strongest determinant of muscle hypertrophy, which suggests that mechanical tension is the most noteworthy stimulus for muscle growth. This is an intuitive idea, but Greg’s segment explains why the results of this study fail to support the conclusions that were stated in the paper (and shared widely on social media).
After that, Eric presents a segment that’s all about food selection. As flexible dieting and “IIFYM” continue to gain popularity, it’s indisputable that dieters can succeed using a virtually limitless variety of food sources, as long as they (approximately) hit their calorie or macro targets consistently. While it’s very true that dieters enjoy a great deal of flexibility in their food choices, this doesn’t mean that food source selection is irrelevant or inconsequential. In Eric’s segment, he discusses some evidence-based guidance for making food choices to facilitate a smoother dieting experience.
*SUPPORT THE PODCAST*
If you want to learn more about our MacroFactor diet app, check it out at macrofactorapp.com/macrofactor
To join in on the MacroFactor conversation, check out our Facebook group and subreddit.
Facebook group: facebook.com/groups/macrofactorcommunity
Subreddit: reddit.com/r/MacroFactor
If you’d like to receive our Research Spotlight emails, please sign up for our email list at strongerbyscience.com/newsletter
To join in on the SBS conversation, check out our Facebook group and subreddit.
Facebook Group: facebook.com/groups/StrongerByScienceCommunity
Subreddit: reddit.com/r/StrongerByScience
Finally, next time you stock up on supplements from BulkSupplements.com, be sure to use the promo code “SBSPOD” (all caps) to get 5% off your entire order.
*TIME STAMPS*
0:00 Intro/Announcements
2:15 Shampoo versus conditioner
6:10 Artificial intelligence for summarizing research
https://consensus.app/
elicit.org
16:01 What’s the primary mechanism of muscle hypertrophy?
20:32 Confirmation bias
22:46 Abstract and summary of new study by Hatanaka and Ishii
jstage.jst.go.jp/article/jpfsm/11/5/11_295/_article/-char/ja
27:47 Estimating the mechanical activation of fast twitch muscle fibers
31:33 How validation studies work
34:30 Exploring the equations used to estimate mechanical activation of fast twitch muscle fibers
jstage.jst.go.jp/article/jpfsm/10/2/10_109/_pdf/-char/ja
41:18 Implications of the model used by Hatanaka and Ishii
48:07 Comparing and contrasting with longitudinal data
ncbi.nlm.nih.gov/pubmed/31895290
50:28 Conclusions
58:25 Flexible dieting and “IIFYM” work, but specific food selection still matters
1:05:24 Regulation of food intake
1:15:53 The satiety index
pubmed.ncbi.nlm.nih.gov/7498104
1:18:43 Effect Of Different Food Groups On Energy Intake Within And Between Individuals
link.springer.com/article/10.1007/s00394-022-02903-1
1:28:10 Some key food characteristics to consider
pubmed.ncbi.nlm.nih.gov/31105044
pubmed.ncbi.nlm.nih.gov/35285882
pubmed.ncbi.nlm.nih.gov/35488870
1:32:10 Practical applications
Mechanical tension, muscle damage, and metabolic stress are often viewed as the key stimuli for muscle hypertrophy. A new study asserts that mechanical activation of fast-twitch muscle fibers is the strongest determinant of muscle hypertrophy, which suggests that mechanical tension is the most noteworthy stimulus for muscle growth. This is an intuitive idea, but Greg’s segment explains why the results of this study fail to support the conclusions that were stated in the paper (and shared widely on social media).
After that, Eric presents a segment that’s all about food selection. As flexible dieting and “IIFYM” continue to gain popularity, it’s indisputable that dieters can succeed using a virtually limitless variety of food sources, as long as they (approximately) hit their calorie or macro targets consistently. While it’s very true that dieters enjoy a great deal of flexibility in their food choices, this doesn’t mean that food source selection is irrelevant or inconsequential. In Eric’s segment, he discusses some evidence-based guidance for making food choices to facilitate a smoother dieting experience.
*SUPPORT THE PODCAST*
If you want to learn more about our MacroFactor diet app, check it out at macrofactorapp.com/macrofactor
To join in on the MacroFactor conversation, check out our Facebook group and subreddit.
Facebook group: facebook.com/groups/macrofactorcommunity
Subreddit: reddit.com/r/MacroFactor
If you’d like to receive our Research Spotlight emails, please sign up for our email list at strongerbyscience.com/newsletter
To join in on the SBS conversation, check out our Facebook group and subreddit.
Facebook Group: facebook.com/groups/StrongerByScienceCommunity
Subreddit: reddit.com/r/StrongerByScience
Finally, next time you stock up on supplements from BulkSupplements.com, be sure to use the promo code “SBSPOD” (all caps) to get 5% off your entire order.
*TIME STAMPS*
0:00 Intro/Announcements
2:15 Shampoo versus conditioner
6:10 Artificial intelligence for summarizing research
https://consensus.app/
elicit.org
16:01 What’s the primary mechanism of muscle hypertrophy?
20:32 Confirmation bias
22:46 Abstract and summary of new study by Hatanaka and Ishii
jstage.jst.go.jp/article/jpfsm/11/5/11_295/_article/-char/ja
27:47 Estimating the mechanical activation of fast twitch muscle fibers
31:33 How validation studies work
34:30 Exploring the equations used to estimate mechanical activation of fast twitch muscle fibers
jstage.jst.go.jp/article/jpfsm/10/2/10_109/_pdf/-char/ja
41:18 Implications of the model used by Hatanaka and Ishii
48:07 Comparing and contrasting with longitudinal data
ncbi.nlm.nih.gov/pubmed/31895290
50:28 Conclusions
58:25 Flexible dieting and “IIFYM” work, but specific food selection still matters
1:05:24 Regulation of food intake
1:15:53 The satiety index
pubmed.ncbi.nlm.nih.gov/7498104
1:18:43 Effect Of Different Food Groups On Energy Intake Within And Between Individuals
link.springer.com/article/10.1007/s00394-022-02903-1
1:28:10 Some key food characteristics to consider
pubmed.ncbi.nlm.nih.gov/31105044
pubmed.ncbi.nlm.nih.gov/35285882
pubmed.ncbi.nlm.nih.gov/35488870
1:32:10 Practical applications
