They report that despite
similar absolute loads between medium and narrow grips, superior biceps muscle activity was produced by the medium grip in the concentric portion only.
Finally, with
a similar absolute load, greater depth during squats leads to a greater hip extension moment, at least as far as parallel (Bryanton et al. 2012; Yoshioka et al. 2014).
Not exact matches
Caterisano et al. (2002) reported that increasing depth led to increasing muscle activity (using the same
absolute loads) but Contreras et al. (2015b) found that increasing depth had no effect on muscle activity (using the same relative
loads), thereby indicating that so long as
similar percentage of 1RM is used, depth has no effect on gluteus maximus muscle activity.
Comparing the back and overhead squats, Aspe and Swinton (2014) found that the back squat displayed greater ground reaction forces to the overhead squat with the same relative
load but
similar ground reaction forces when using the same
absolute load.
Andersen et al. (2005) similarly found that lower erector spinae muscle activity was
similar in barbell back squats and smith machine squats with the same
absolute load but they found superior muscle activity in the upper erector spinae in the barbell squat.
As explained above, agonist muscle forces (as indicated by the proxy of EMG) are probably largely
similar when lifting the same relative
load (but a different
absolute load) under stable and unstable conditions.
When investigating exercises performed with the same relative
load (which means a lower
absolute load in the unstable condition), some researchers have found that EMG amplitude of the prime movers is
similar in exercises performed in unstable and stable environments.
Comparing the deadlift with the good morning, Schellenberg et al. (2013) found that peak L4 - L5 net joint moment during the deadlift was
similar during the good morning and the deadlift (using the same
absolute load).