This is a posture analysis for the Sirsasana asana (headstand). My research made it clear that there is significant confusion over the benefits and risks involved in performing a headstand. Interestingly headstand is not mentioned in the Hatha Yoga Pradipika or any of the old texts (that I can find) viagra en internet.
That bothered me considerably until I read an article by Alanna Kaivalya (the author of ‘Myths of the Asanas’) where she points out that most of the asanas we practice today are less than 100 years old.
Her of article entitled ‘Where do Yoga poses come from: are we making this shit up?’ is well worth a read too.
After reading those articles I relaxed and concluded that figuring out if a particular asana is relevant and that its benefits are real is probably a very personal process.
Perhaps headstand will work for you but not your friend. The only way to find out is to do it rather than reading all the literature, but, just in case you want to read about it I hope this posture pack is helpful for you.
I need to update the analysis as I forgot to include some of the joint and muscle actions;
Skeletal joint actions
Upper Limbs: Scapular upward rotation, shoulder flexion and adduction, elbow flexion, neutral forearm, hand and finger flexion.
Lower Limbs: Hip adduction and neutral extension, knee wholesale nba jerseys extension, ankle dorsiflexion.
Muscular joint actions
Spine: To calibrate concentric and eccentric contractions to maintain neutral alignment the spinal extensors and flexors act both concentrically and eccentrically as needed. To balance and stabilize atlanto-axial and atlanto-occipital joint (and not break your neck): Rectus capitis anterior, rectus capitis posterior major and minor, obliquus capitis superior and inferior, longus capitis and colli.
Upper limbs: Concentric contraction to upwardly rotate scapular using the serratus anterior. The rotator cuff Julian and delts also act concentrically to stabilize and protect the shoulder joint and to maintain integrity in the hand the intrinsic muscles of the wrist and hand (I have no idea of the names) are also acting concentrically. cheap MLB jerseys To resist elbow flexion cheap nfl jerseys the triceps are acting eccentrically.
Lower limbs: The hamstrings*, adductor magnus and gluts act concentrically to maintain neutral hip extension and adduction. The gracilis acts Welcome concentrically to adduct the hip as do the articularis genu and Recap vastii to extend the knee. To create dorsiflexion (you ARE pointing your feet aren’t you?) the tibialis anterior also acts concentrically. Again the only eccentrically acting muscles are the psoas to prevent the legs falling backwards!
* all of them. i.e. Semimembranosus, Semitendinosus, and Biceps femoris.
The serratus anterior also helps stabilize lateral flexion (hopefully no falling over sideways). Probably the thoracic extensors engage in most people to help with stability too.
There’s also a lot on with breathing when you’re in a wholesale jerseys headstand as the transverse abdominals, internal To obliques, and the diaphragm are also active and all the internal organs which han are attached to the central tendon of the diaphragm move differently in inversions.