Hello Dr. Matthews, thank you for this informative video! Based on the image about the Size Principle of M.Unit Recruitment; I assume that it is safe to say that smaller fibers get innervated by smaller motor units and larger fibers by larger motor units. What exactly is the factor that determines the fiber's motor unit? Is it the length or the width? In other words; Is a type I fiber smaller than a type IIx fiber relative to its length or width? Thank you!
Hi Cafe Colombian Dreams Company. The playlist below is the best playlist I have for preparing for the ACSM CEP exam. It is likely incomplete, and is slightly out of date at this point. The lecture set on muscular fitness is especially out of date at this point. The rest are mostly current. Playlist for the Exercise Assessment and Prescription course th-cam.com/video/95lY1olo6Us/w-d-xo.html Good luck!
Could I also get a copy of the power point to your lectures? This has really helped a lot and I think having the PP as a reference would help even more.
Hello! Dr. Matthews. I hope you are doing well... When I perform crunches; sometimes my abdominal muscles get shaky too, especially at the final 2 or 3 reps 🥲I always thought that it is probably associated with some form of fatigue; either depletion of acetylcholine or failure to reach complete tetanus, or maybe local fatigue. Do you think the reason is not warming up enough? Can a lack of warm-up be associated with fatigue? Thank you!
Warming up does improve neuromuscular activation, blood flow, metabolic enzyme activity, and other things that reduce feelings of fatigue. However, given that it is happening towards the end of the set instead of the beginning, it is probably running out of phosphocreatine rather than a lack of warming up. It's impossible to be sure though.
If as intensity increases more type 2a then 2x are recruited dose this partly explain the maximum lactate steady state after the mlss more type 2 fibres are recruited and therefore more glycolysis?
This would partially explain why you are getting more lactate in the blood. The maximum lactate steady state is going to be determined by both your transition point to more anaerobic exercise and your ability to clear lactate from the blood.
Vivo Phys - Evan Matthews thank you for the reply , so as we get fitter we are able to produce more power aerobically and this is why mlss is higher ? Or we have the same amount of glycolysis but we just have more capacity to use pyruvate in the mitochondria ? Or abit of both ? Or have I got it wrong ?
Amazing videos so far! I'll be working through all the videos in order to teach myself exercise physiology during this online semester... 😨
This is a tough semester for all of us. Good luck! I hope you find them all helpful.
great series!!!
Thank you very much, you give us treasure!
Hello Dr. Matthews, thank you for this informative video! Based on the image about the Size Principle of M.Unit Recruitment; I assume that it is safe to say that smaller fibers get innervated by smaller motor units and larger fibers by larger motor units. What exactly is the factor that determines the fiber's motor unit? Is it the length or the width? In other words; Is a type I fiber smaller than a type IIx fiber relative to its length or width? Thank you!
Cross sectional area. So more related to width than length. Length is determined by where the muscle attaches to the skeleton.
Dr great videos! Question. I see you have a ton of content...but are there a string of specific videos you recommend for the acsm cep
Hi Cafe Colombian Dreams Company.
The playlist below is the best playlist I have for preparing for the ACSM CEP exam. It is likely incomplete, and is slightly out of date at this point. The lecture set on muscular fitness is especially out of date at this point. The rest are mostly current.
Playlist for the Exercise Assessment and Prescription course
th-cam.com/video/95lY1olo6Us/w-d-xo.html
Good luck!
Could I also get a copy of the power point to your lectures? This has really helped a lot and I think having the PP as a reference would help even more.
I'm sorry, but at the moment I am not releasing my PowerPoints to people that are not my students at Montclair State University.
Hello! Dr. Matthews. I hope you are doing well... When I perform crunches; sometimes my abdominal muscles get shaky too, especially at the final 2 or 3 reps 🥲I always thought that it is probably associated with some form of fatigue; either depletion of acetylcholine or failure to reach complete tetanus, or maybe local fatigue. Do you think the reason is not warming up enough? Can a lack of warm-up be associated with fatigue? Thank you!
Warming up does improve neuromuscular activation, blood flow, metabolic enzyme activity, and other things that reduce feelings of fatigue. However, given that it is happening towards the end of the set instead of the beginning, it is probably running out of phosphocreatine rather than a lack of warming up. It's impossible to be sure though.
If as intensity increases more type 2a then 2x are recruited dose this partly explain the maximum lactate steady state after the mlss more type 2 fibres are recruited and therefore more glycolysis?
This would partially explain why you are getting more lactate in the blood. The maximum lactate steady state is going to be determined by both your transition point to more anaerobic exercise and your ability to clear lactate from the blood.
Vivo Phys - Evan Matthews thank you for the reply , so as we get fitter we are able to produce more power aerobically and this is why mlss is higher ? Or we have the same amount of glycolysis but we just have more capacity to use pyruvate in the mitochondria ? Or abit of both ? Or have I got it wrong ?
If you become more aerobic aerobically fit then your mitochondria is able to take in and use more pyruvate.
great lecture, anyway I can get a copy of the power points for exercise phys?
Send me an email