The purpose of this study was to compare the ratio of the electromyograms (EMGs) obtained while using concentric lat-pull
down weight-training machines based on magnetic technology and traditional lat-pull down weight-training machines. The
subjects were physically and psychologically healthy 20 university students who were aged between 21 and 28. EMGs were
obtained while the subjects performed lat-pull downs using a magnetic skilled concentric weight-training machine and a
classical concentric–eccentric weight-training machine. One repetition was defined as 1 flexion and 1 extension. Each subject
randomly performed 5 repetitions of the magnetic skilled concentric lat-pull down, followed by a 2-minute rest, and then 5
repetitions of classical concentric–eccentric lat-pull downs. Thus, we analyzed total 100 repetitions (20 subjects × 5 repetitions)
of each type. Ratios of EMGs of the biceps muscle showed significant difference, magnetic lat-pull down with 68.63 ± 60.19%
and classical lat-pull down with 91.65 ± 69.32% (p = 0.013). Similarly, ratios of EMGs of the triceps muscle significantly
different, magnetic lat-pull down with 90.90 ± 89.35% and classical lat-pull down with 140.13 ± 136.97% (p = 0.003). Significant
difference was also observed in the ratio of EMGs of the posterior deltoid muscle, magnetic lat-pull down with 188.76 ±
190.90% and classical lat-pull down with 377.17 ± 327.20% (p < 0.001). In addition, a significant difference was observed in the
ratio of EMGs of the latissimus dorsi muscle, magnetic lat-pull down with 145.19 ± 88.06% and classical lat-pull down with
236.84 ± 138.32% (p < 0.001). Finally, a significant difference was observed in the ratio of the EMGs of the serratus anterior
muscle, magnetic lat-pull down with 56.64 ± 33.02% and classical lat-pull down with 81.78 ± 45.27% (p < 0.001). On the basis
of these results, we concluded that the magnetic skilled concentric weight-training machine could be used as a new type of
fitness equipment for prevention of muscle damage.