Effiency
     A.   Figured in percent.

          1.   eff.  =  (work output * 100) / (energy input)

          2.   if 20 % eff, then 20 % of the energy is spent on
               work, 80 % is spent on ...(sweat)
          3.   expressed in (kg*m/min) / (l/min)  : we convert
               this to kcal.
          4.   RQ plays and imp. role as it will determine if
               burning fuel at 4.7 - 5.0 kcal / (L/O2)
          5.   This gives the gross energy cost
               a.   energy to do work and also to function.
                    (1)  1/4 L/min @ rest
          6.   To compute net, need to subtract resting O2
               concentration.

     B.   Influenced by:
     
          1.   Body Size   (incr. weight = decreased effiency)
               a.   esp. if extra fat
          2.   Fitness Level
               a.   more fit can do more work
               b.   can also work w/ higher intensity and higher
                    effiency
          3.   Skill level
               a.   refers to wasted motion
          4.   Air or H2O resistance during activity
               a.   resistance is in proportion to velocity
                    squared
          5.   Speed task is performed at
               a.   most tasks have an optimal speed
     
     C.   Effiency measures
          1.   Endurance Capacity
               a.   limited supply of energy
               b.   accelleration or decelleration decrease
                    effiency

     D.   Ways to increase effiency
          1.   See the 5 ways effiency is influenced by