Відео

Thanks for the sub!

Hi, thanks for your comment! Yes, you could use some sort of combination of lookup function to extract based on a particular condition. Probably most commonly though, I use a pivot table to extract by player name or periodisation day, and calculate the z-scores from that. Maybe I should demonstrate that in a future video?

@@globalperformanceinsights Thanks! I'll try with lookup combinations. In the meantime, I will wait patiently for your tutorial.

Hi there. Thank you! Impulse is a function of force and time, so it could just be higher due to doing the Nordic over a longer time period... However, if we identify it isn't the time factor then it is a result of greater force output. This higher force output could be due to neural adaptations like you mention (i.e. increased muscle activation during eccentric contractions) but could also be due to structural adaptations (i.e. increase in biceps femoris fascicle length). We wouldn't know with the NHE data alone exactly which of these adaptations (or the combined magnitude of both types) was driving the increased force output. That said, it would ultimately represent an improvement in eccentric muscle strength. I hope that makes sense. Thank you for your comment!

@@globalperformanceinsights thanks a lot for your reply! It really makes sense, it’d be really interesting to see if there’s any research done in this topic!

@@choi6539 Absolutely. Here is one paper on the structural adaptations: www.sciencedirect.com/science/article/pii/S2095254621000995#:~:text=Biceps%20femoris%20long%20head%20fascicle,distal%20portion%20of%20the%20muscle. And here is one looking into the neural adaptations: link.springer.com/article/10.1007/s00421-015-3325-3

Yes, it is a similar concept, trying to help guide whether athletes would benefit more from plyometric or max strength emphasised training.

Sure. Ratio scaling (i.e. simple division by bodyweight) allows comparisons between athletes normalized to bodyweight. However, this simple approach assumes that strength is directly proportional to body mass, which is not necessarily the case. Allometric scaling may be more appropriate, particularly in settings with wide variation in body size and strength. Dividing strength by body mass raised to an appropriate power can eliminate the effects of body mass, although debate remains regarding the most appropriate scaling exponents. You can read more in Folland et al (2008): link.springer.com/article/10.1007/s00421-007-0654-x

My pleasure!

Thank you!

My pleasure! Thank you.

Hi Nicolas. Thanks for your question. I presume that is because you find athletes of that height don't fit? I'd say there's a few different ways to build a rig, often using a squat rack, straps, or you can have a custom built rack made (if you have the budget for it!). Here's some examples: www.google.com/search?sca_esv=e4dd71f640266e19&q=seated+calf+isometric+force&udm=2&fbs=AEQNm0Aa4sjWe7Rqy32pFwRj0UkWd8nbOJfsBGGB5IQQO6L3J_86uWOeqwdnV0yaSF-x2joQcoZ-0Q2Udkt2zEybT7HdnwtJ4zecPSJKnTlqcRa4FingmzFHjMvqrWogZeShrrLVDeibS-5yZzsmYor4Krf6WoChzeuSwvgUMYwML507ycF_GBPIi95OGwcvBnfQE_zRQRk4&sa=X&ved=2ahUKEwj_s5fwttSHAxX1X0EAHcoJGMoQtKgLegQIEBAB&biw=1536&bih=730&dpr=1.25

Thanks!

Glad it was helpful!

That's great to hear, thank you!

Technology is definitely becoming more accessible across all different levels of sport. Thanks for your comment!

Glad it was helpful Braylee! Let me know if there were any other questions you had!

Thanks so much Jacob!

Hi, you can find it at this point in the video: ua-cam.com/video/16GZ1Ed2uVE/v-deo.htmlsi=qr4GX4kGQU_eak0z&t=232 Also, I have written further instructions on my blog here: www.globalperformanceinsights.com/post/mastering-z-scores-t-scores-statistics-in-sports-science-zscore

Awesome, you're welcome!

Thanks! Will do!

Thank you. Not DSI specifically as that is based on force so you would need a force plate. Another option however, would be to look into Eccentric Utilisation Ratio (EUR). For this you compare the output of a squat jump vs a countermovement jump. You can use force if you have access to it, but crucially in your situation you could compare jump height of both using your jump mat. As always, there's limitations with ratios but it can be used to assess the individual's stretch shortening cycle. In theory, the CMJ should be higher than SJ, a ratio of around 1.1 and above has been suggested i.e. 10% greater jump performance in CMJ. If it is less than that, then perhaps the individual should focus on plyometric training to improve this quality.

Thanks! 😃

Thank you! I think they would represent different aspects of lower-body isometric strength. The ISO hip push is assessing hip extension, whereas the McCall 9090 is more focused on knee flexion. I did see the release of the new ISO measurements on the VALD system, so perhaps they should be a focus of a future video.

Hi there. Absolutely, you can use RPE and wellness - two evidence-based methods that only require pen and paper - to measure load and response in your athletes. RPE being a scale of intensity that can be multiplied by time to give you a "session RPE Load". Then you can track responses to training load with a subjective wellness questionnaire. I discuss both methods further in these videos: RPE: ua-cam.com/video/YqXvO49Qy2I/v-deo.htmlsi=s62Kz0ZYggzvtSIo Wellness Questionnaires: ua-cam.com/video/o01MbWyGx1w/v-deo.htmlsi=oBifAm_rzML31GFg I've also described in more detail in this open-access article in the Strength and Conditioning journal: journals.lww.com/nsca-scj/fulltext/2018/12000/developing_cost_effective,_evidence_based_load.11.aspx Let me know if you have any specific questions!

@@globalperformanceinsights Jo thank you so much for the resources recommended.. can you do a video on interaction of ergogenic aids with exercise and performance. It will be useful for many. Also share with me if you have any related sources.

Thanks, glad you think so!

Glad it was helpful!

Thank you. Yes that's exactly how I would cue the drop jump.

Thank you Carlos! Sounds like the courses will be perfect to help you develop and practice with sports science related examples and tasks. Good luck!

Awesome, thanks so much!

Glad to hear it! Thanks for your comment.

Great tip!

Thanks Eddie!

Thanks!

Thank you! Yes the benefit of SMFT is that you should be able to run all your athletes at once. I agree that if you cannot get a team-wide budget for HR monitoring, it would be good to make use of the wearable devices the athletes own personally. The SEM between-devices is likely variable depending on the device, so I'd suggest only making within-athlete observations (i.e. Athlete A's heart rate score has changed from x to y), and NOT between-athlete observations (i.e. Athlete A's score is X but Athlete B's score is Y). Another option could be to collect RPE from the athletes and track how their subjective perception of effort during the SMFT changes, but I find athletes tend to get bored/repetitive with this when it is the same fixed load.

Glad you like them!

Thank you! Yes, you can use jump height with single leg CMJ on a jump mat to calculate unilateral asymmetry. Just remember a jump mat is very simple so it only shows you the outcome (ie jump height), it cannot tell you about different strategies. So someone may be able to reach the same height but achieve it in different ways due to differences in limb capacity left vs right. If you are limited to just a jump mat with your budget, then I recommend trying to film the jumps (even just with your phone) as well so you can look back on the videos to see visually if there are any differences in how they jump, alongside the data of how high they jump from the mat.

Hi Jonathan, thanks for your comment. Glad you think so!

Thank you very much. The Peak Vertical Force is probably best but the most important thing is just that you are consistent with which you use. As I understand it, the Net Peak Vertical Force just removes the body mass.

Great suggestion! Thank you.

Thank you! Thanks for an interesting comment. I think the use of the DSI is supported by the message in Lachlan James and co's study. Their study suggested dynamic and isometric strength are two separate forms of strength that should not be used interchangeably (i.e. being strong in one does not guarantee you are strong in the other). To quote from the practical applications: "As the 2 assessments represent separate strength domains, it may also be necessary for practitioners to use specific training interventions depending on whether isometric or dynamic strength is targeted." So I would certainly look to assess both of these capacities; the DSI then provides a way to look at the capacity in the two strength domains and see which end of the spectrum is best targetted in the training programme.

Here's the paper (open access) for anyone who wants to read further: journals.humankinetics.com/view/journals/ijspp/19/1/article-p2.xml

@@globalperformanceinsights I see now. Thank you for the response!

@@NYMballislifeMLB You're welcome!