what's here
- Focus of technique
- Muscles used
- Sequence of phases
- Video checkpoints
see also
Focus of technique
Maximum power thru the skis -- on both sides -- aided by maximum
reactive side-force.
- compromise pole-push motion to achieve optimum skate-push
- minimize up-and-down motion to focus on side-to-side torso-swing
Analysis of approach
There's no overall beauty to the V1 skate sequence -- no unifying
concept which is the key to learning it. It's just a bunch of useful
actions, each with effective physics / biomechanics on its own.
The learning process is to start to "feel the physics" of each one.
Then refine and optimize each action.
The long-term key is to find some trick for noticing when you've
forgotten one of the actions and fallen back onto a non-optimal old
version of it.
[ to be added ]
[ to be added ]
special recovery path for recovery-side arm
After the finish of its pole-push downward and backward
-- instead of recovering directly forward to get ready for the next
pole-push -- the recovery-side arm can make two moves: (1) first outward
toward the side, then (2) inward and forward and across toward the other
side.
What to do with the pole? It seems to work out
OK if the pole is held loosely during these moves, so the tip of the
pole does not follow the arm in moving outward.
If timed accurately, the outward arm-swing move can add
propulsive work in the following ways:
Timing: For maximum contribution to propulsive
work, the outward move of the arm should be synchronized with the torso
side-swing move toward the recovery-side -- which might require a small
delay after the finish of the pole-push: hold back, then go quick. The
key is that the starting and acceleration of the move occur during the
last phase of the poling-side leg-push, achieving maximum sideways speed
during transfer of weight to the other leg, then the deceleration and
stopping occur after the recovery-side leg has been set-down and started
the first phase of its leg-push.
Inward move: Elite racers as of 2005 seem to start the next pole-push
simultaneous with the set-down of the poling-side, or a bit earlier than
set-down. In either case the deceleration of the inward move must occur
while the recovery-side leg is still pushing -- so the acceleration and
deceleration work of the inward move are self-cancelling.
But there's another possibility:
If the start of the recovery-side arm's pole-push move were delayed
until after the start of the poling-side leg-push, then both the
acceleration and the deceleration of the inward arm-recovery move would
be propulsive -- in addition to the outward move.
So why don't elite racers do this? I suspect it's because they
they want to get the pole-push move started immediately on set-down of
the other leg -- and the first phase of the pole-push if mostly the
spine-torso crunch move downward and backward. The main role of the arms
in this phase of the pole-push is to "rigidly" transmit the force of
from the spine-torso crunch -- instead of the arms collapsing and
absorbing the crunch move. The problem is that it's difficult for one
single arm to transmit the force of the crunch without collapsing --
which is what could happen if they delayed the start of the
recovery-side arm's pole-push.
[ to be added ]
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