الكاتب رسالة

<  الأمثال الشعبية  ~  glute activation and strength to

مشاركة غير مقروءةمرسل: السبت يناير 19, 2019 8:10 am
مشاركات: 228اشترك في: الثلاثاء نوفمبر 13, 2018 11:50 am
As can be seen, muscle activity changes associated with Adidas Campus Womens a 10% increase in step rate all occurred during the swing phase (while the foot is not in contact with the ground), with most occurring during mid- to late swing phase as the leg prepares for impending ground contact. The authors suggest that although muscle activity during loading did not change, pre-activation Nike Air Max 270 Femme of muscles prior to initial contact influences limb stiffness at contact. They point out that reduced hamstring pre-activation during swing phase has been linked previously to reduced running economy, and they suggest that increased hamstring pre-activity observed at higher step rates might contribute to reduced loading at the knee via the effect of this muscle activity on landing posture. They also suggest that increased activity of the gluteal muscles in late swing phase could contribute to the altered movement and loading Nike Air Max Classic BW Femme of the hip that has been observed with increased step rate, and they indicate that increasing step rate might be a good way to facilitate activation of the glutes for therapeutic purposes (e.g., in patients with anterior knee pain where glute strengthening is a common rehab approach).green overstriderLet’s Nike Epic React Flyknit Donne try to translate these results into a clearer description of what is happening. Imagine an overstriding runner who lands with the foot way out in front of the knee and the foot inclined 45 degrees relative to the ground at contact (like the one in the photo to the left). Generally, this type of stride is associated with a fairly low step rate. Now suppose we have this person increase their cadence by 10%. Previous work has shown that this results in the outcomes discussed above: the foot lands flatter, contact shifts closer www.artealjabiri.deto the body, the knee is more flexed at contact, and hip and knee loading are reduced. What’s cool about the Chumanov study is that it shows how these postural changes are accomplished at the level of the muscles. Initial leg swing is sped up by activation of the rectus femoris. At the end of swing, contact is Nike Air Max 90 Womens pulled closer to the body by the hamstrings, which slow the forward swing of the lower limb just prior to contact, as well as the glutes, which start to pull the thigh back a bit prior to contact. The calf muscle pre-activates to a greater degree, and the tibialis anterior on the front of the shin reduces its activity, resulting in a flatter foot plant.My friend Brian Martin over at Running Technique Tips will love this study because he really hammers on the importance of proper hamstring and glute activation and strength to Adidas Sambarose Mens running efficiency. It also raises a ton of questions in my mind about the relationship between overstriding, muscle strength, and footwear. Given that many of us spend much of our day sitting in a chair, our hip flexors tend to tighten, leading to an imbalance in hip muscle function. Tight flexors reduce our ability Nike Dunk Sky High Femme to extend the hip on the backside, and thus we need to elongate in the front to gain stride length. If we also have weak hamstrings or improper hamstring activation, they may be less able to pull the lower leg back prior to contact. It’s a recipe for overstriding. Add on to all of this a heavy pair of shoes at the end of the foot that increases the moment of inertia of the lower leg as it rotates at the knee (think about swinging a golf club while holding the handle vs. holding the head – which is harder to slow down?).Nike Air Max 95 Femme As we swing that foot forward with a heavy shoe at the end, it may be harder for the hamstrings to do their job to slow the leg down and prepare it for landing. I’m wondering if this might explain why I can run relatively comfortably in a lightweight shoe with a relatively high heel-forefoot drop (like the Adidas Adios) but can’t stand heavy shoes with a high drop. Shoe weight has always been one of the things that I have been most sensitive to, and this has got me thinking…


يشاهد الملف الشخصي

عرض مشاركات سابقة منذ:  مرتبة بواسطة:

جميع الأوقات تستخدم GMT + 3 ساعات
صفحة 1 من 1
مشاركة واحده
البحث عن:
إرسال موضوع جديد  الرد على الموضوع
لا تستطيع كتابة مواضيع جديدة في هذا المنتدى
لا تستطيع كتابة ردود في هذا المنتدى
لا تستطيع تعديل مشاركاتك في هذا المنتدى
لا تستطيع حذف مشاركاتك في هذا المنتدى
لا تستطيع إرفاق ملف في هذا المنتدى
cron