It is feasible that despite the similar internal muscle forces under both stable and unstable conditions (because of greater synergist and antagonist activation), some of these factors could still be influenced by
the greater external load used when training under stable conditions.
Therefore, it appears that the gastrocnemius displays superior muscle activity when performing the squat with
greater external load.
This is due to the fact that the difficulty of the traditional plank is increased by extending the time of the hold, or by using
greater external load.
Not exact matches
This barrier is critical because «The mucosa is directly exposed to the
external environment and taxed with antigenic
loads... at far
greater quantities on a daily basis than the systemic immune system sees in a lifetime» (Mayer, 2003).
The two
loading protocols produced similar fiber type shifts, but the high
external load protocol produced much
greater hypertrophy.
It appears that the middle gastrocnemius displays a
greater change with increases in
external load at lower relative intensities than the lateral gastrocnemius.
Your bodyweight places a
greater load on your back and arms while doing a pull up than the
external weight of the lat pull down.
Strength gains after accommodating resistance training tend to be
greatest when tested using accommodating resistance; gains in strength after conventional weight training tend to be
greater when tested with constant
external loads.
During the squat, increasing relative
load leads to
greater external oblique muscle activity but does not alter rectus abdominis or transverse abdominis muscle activity.
Comparing the split squat with the back squat, Andersen et al. (2014) used a 6RM
load in resistance - trained males and found that there was no difference between the exercises in respect of the rectus abdominis muscle activity but that the split squat displayed
greater external obliques muscle activity than the standard back squat.
They reported that
external oblique muscle activity was higher with
greater relative
loads.
Adding
external load and using an unstable surface during curl ups leads to
greater rectus abdominis and
external oblique muscle activity.
Similarly comparing 50 % and 75 % of 1RM, Willardson et al. (2009) also found that
external oblique muscle activity was higher with
greater relative
loads.
It is expected that performing deadlifts with the same absolute
load would produce
greatest EMG amplitude in the gluteus maximus when deadlifts are pulled from the lower starting points because
external hip extension moment arm lengths and hip extension moments are
greatest at lift - off in comparison with knee - passing and lock - out (Escamilla et al. 2000; Escamilla et al. 2002).
Although performing back squats with the same absolute
load but to a
greater depth has been found to lead to increased gluteus maximus EMG amplitude (Caterisano et al. 2002), this is likely because
greater depth leads to
greater hip extension moments for the same absolute
external load (Bryanton et al. 2012; Clark et al. 2012).