everything wrote:What muscle is lengthening in this eccentric movement? Thigh as you lower a stance? Doesn't seem like anything else is a "negative". Seems like Jefferson curls are needed to balance the other side of the legs.
yeniseri wrote:Excellent!
Even baquazhang (though a little more complex) employs a similar set of movement patterns, the Emory University study with tai chi as a base intervention was able to lead in the conceptual analyses towards this 'eccentrically biased movement pattern). Interestingly Yang style was the intervention that showed this foundation.
Yeung wrote:The performance capacity of a muscle or a muscle fibre is usually
greater when it is lengthened while being activated (eccentric
contraction) than when it shortens (concentric contraction) (Edman,
1988; Herzog, 2014; Katz, 1939; Morgan et al., 2000). The
realization of this potential in vivo, however, depends on the
intensity of the motor command sent by the nervous system. Indeed,
the magnitude of muscle activation depends on the number of motor
units (ensemble comprising a motor neurone and the fibres
innervated by its axon) that are recruited and the rate at which
they discharge action potentials (Duchateau and Enoka, 2011;
Heckman and Enoka, 2012). A number of studies during the last few
decades have established that the control strategy employed by the
nervous system during a lengthening contraction differs from those
used during shortening and isometric contractions (Duchateau and
Baudry, 2014; Duchateau and Enoka, 2008; Enoka, 1996).
From: Journal of Experimental Biology (2016) 219, 197-204 doi:10.1242/jeb.123158
Yeung wrote:I am suggesting that the variable is eccentric muscle contraction which has explained why "The performance capacity of a muscle or a muscle fibre is usually greater" in Taijiquan, etc. The concept of shu/shi is not full and empty, it is the transfer of the body weight between 0 and 100% in a passive stance, sinking eccentrically.
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