Not sure how much this tells us. Basically standing one arm presses cause more activation of the "core" than doing them seated with both arms.
Muscle activity of the core during bilateral, unilateral, seated and standing resistance exercise
Little is known about the effect of performing common resistance exercises standing compared to seated and unilaterally compared to bilaterally on muscle activation of the core. Thus, the purpose of this study was to compare the electromyographic activity (EMG) of the superficial core muscles (i.e. rectus abdominis, external oblique and erector spinae) between seated, standing, bilateral and unilateral dumbbell shoulder presses. 15 healthy males performed five repetitions at 80% of one-repetition maximum of the exercises in randomized order. Results were analyzed with a two-way analysis of variance and a Bonferroni post hoc test. The position × exercise interaction was significantly different for rectus abdominis (P = 0.016), but not for external oblique (P = 0.100) and erector spinae (P = 0.151). The following EMG results were observed: For rectus abdominis: ~49% lower in seated bilateral versus unilateral (P < 0.001), similar in standing bilateral versus unilateral (P = 0.408), ~81% lower in bilateral seated versus standing (P < 0.001), ~59% lower in unilateral seated versus standing (P < 0.001); For external oblique: ~81% lower in seated bilateral versus unilateral (P < 0.001), ~68% lower in standing bilateral than unilateral (P < 0.001), ~58% lower in bilateral seated versus standing (P < 0.001), ~28% lower in unilateral seated versus standing (P = 0.002); For erector spinae: similar in seated bilateral versus unilateral (P = 0.737), ~18% lower in standing bilateral versus unilateral (P = 0.001), similar in seated versus standing bilateral (P = 0.480) and unilateral (P = 0.690). In conclusion, to enhance neuromuscular activation of the superficial core muscles, standing exercises should be used instead of seated exercises, and unilateral exercises should be used instead of bilateral exercises.
I mentioned a few weeks ago that I was taking part in "Dry January". I didn't make a big song and dance about it, but I decided to go for a calendar month or so with no alcohol. A few people have asked me about my experience, so here are a few points. Why take a break from drinking? Alcohol is an interesting topic. As a drug it is widely accepted in society, central to so much of our socialising and leisure. There seem to be lots of health benefits - so we are told - yet there are also a lot of problems in terms of health, relationships and lifestyle that come from drinking. Over a few years I'd begun to become aware and then concerned that I was drinking too much and too regularly. I am in a busy and stressful job and sometimes a glass of wine after work to relax is really helpful. But over time, one glass became two. Two glasses became ....I might as well finish the bottle. A habit got established....and was starting to get too e...
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I think the conclusion should not be used as a general training guideline but should be considered withing the scope of specificity and individuality. For me, I mix it up and will train unilaterally a few times a month.