Magnetic Stimulation of the Quadriceps: Analysis of 2 Stimulators Used for Diagnostic and Therapeutic Applications

Effect of Pulsed Magnetic Field on Peak Torque of Quadriceps/Hamstring Muscles and Knee Proprioception in Athletic Subjects:A Randomized Controlled Study

“…Those findings are intriguing as it may explain the ability of the pulsed magnetic field to directly stimulate motor nerves leading to the production of action potentials that result in muscle stimulation which if repeated and continued for enough time may improve muscle force production abilities and maybe muscle cross-section. Our findings are similar the results of the study of Madariaga et al, (2007) [28], who investigated the effect of direct magnetic stimulation on quadriceps muscle. Study participants could perform contractions of the quadriceps muscle in isometric contraction mode equivalent to 80% of the maximum twitch stimulation which considered being good enough for direct stimulation by the magnetic field and can be used in muscle rehabilitation.…”

Relationship between ventilatory constraint and muscle fatigue during exercise in COPD

“…Supramaximal muscle stimulation [26,27] was applied over the right vastus lateralis motor point using a magnetic stimulator (Magpro R30; Medtronic Inc., Minneapolis, MN, USA) and parabolic coil (MMC 140; Medtronic Inc.) [28,29]. The coil was placed over the approximate location of the vastus lateralis motor point then repeatedly stimulated the muscle at 50% of the stimulator output.…”

“…A plateau in M-wave amplitude during progressive intensity motor stimulation is a critical criterion for fatigue studies, to ensure that stimulation is supramaximal [4,25]. Supramaximal magnetic motor point stimulation has been used previously in other populations and has been shown to be valid and reliable [26][27][28][29]. The current authors were able to demonstrate an M-wave plateau in all of the study subjects during magnetic stimulation, and the TwVL measurements demonstrated excellent reliability; therefore, the technique appears to be appropriate.…”

Strengthening of Quadriceps by Neuromuscular Magnetic Stimulation in Healthy Subjects

“…Madariaga et al compared the effect of circular and figure 8–shaped coils to stimulate the femoral nerve, and reported that single supramaximal stimulation of the quadriceps could not be guaranteed using a circular coil. However, a circular coil generated sufficient contraction for repetitive stimulation [35]. Figure 8–shaped coils strongly focus the induced eddy currents and are therefore less suitable than circular coils for repetitive stimulation of deep muscle.…”