THE EFFECTS OF NEUROMUSCULAR ELECTRICAL STIMULATION TRAINING ON ABDOMINAL STRENGTH, ENDURANCE, AND SELECTED ANTHROPOMETRIC MEASURES
John P. Porcari 1 , Jennifer Miller 1, Kelly Cornwell 1, Carl Foster 1, Mark Gibson 1, Karen McLean 2 and Tom Kernozek 2
1 Department of Exercise and Sports Science, University of Wisconsin-La Crosse, USA
2 Department of Physical Therapy, University of Wisconsin-La Crosse, USA
Received: 24 December 2004 / Accepted: 11 February 2005 / Published (online): 01 March 2005
©Journal of Sports Science and Medicine (2005) 4, 66-75
http://www.jssm.org
Research article
ABSTRACT
We studied the effects of self-administered neuromuscular electrical stimulation (NMES) on changes in strength, endurance, selected anthropometric measures, and subject’s perceived shape and satisfaction of the abdominal wall.. The stimulation
group had a 58% increase in abdominal strength, whereas the control group did not change. The stimulation group also had a 100% increase in abdominal endurance versus a 28% increase in the control group. Waist circumference decreased by of 3.5 cm in the stimulation group compared to no significant change in the control group. All 24 subjects in the stimulation group felt that their midsections were more “toned” and “firmed” and 13/24 (54%) felt that their posture had improved as a result of the stimulation. None of the control group subjects reported changes in these parameters. There were no significant differences in body weight, BMI, or skinfold thickness over the course of the study in either group. NMES, as used in the current study, resulted in significant improvements in the muscular strength and endurance of the abdominal region, as well as subject’s perceived shape and satisfaction of the midsection
Electroestimulación resultó en mejoras significantes en la fuerza y resistencia en la zona abdominal
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APPLIED SCIENCES
Biodynamics
Effect of combined electrostimulation and plyometric training on vertical jump height
NICOLA A. MAFFIULETTI, SERGIO DUGNANI, MATTEO FOLZ, ERMANO DI PIERNO, and FRANCO MAURO INSERM/ERIT-M 0207 Motricite´-Plasticite´, Faculte´ des Sciences du Sport de Dijon, Universite´ de Bourgogne, FRANCE; and Facolta` di Scienze Motorie, Universita` degli Studi di Milano, ITALY
ABSTRACT
MAFFIULETTI, N. A., S. DUGNANI, M. FOLZ, E. DI PIERNO, and F. MAURO. Effect of combined electrostimulation and plyometric training on vertical jump height. Med. Sci. Sports Exerc. Vol. 34, No. 10, pp. 1638–1644, 2002. Purpose: This study investigated the influence of a 4-wk combined electromyostimulation (EMS) and plyometric training program on the vertical jump performance of 10 volleyball players. Methods: Training sessions were carried out three times weekly. Each session consisted of three main parts: EMS of the knee extensor muscles (48 contractions), EMS of the plantar flexor muscles (30 contractions), and 50 plyometric jumps. Subjects were tested before (week 0), during (week 2), and after the training program (week 4), as well as once more after 2
wk of normal volleyball training (week 6). Different vertical jumps were carried out, as well as maximal voluntary contraction (MVC) of the knee extensor and plantar flexor muscles. Results: At week 2, MVC significantly increased (20% knee extensors, 13% plantar flexors) as compared to baseline (P 0.05). After the 4-wk training program, different vertical jumps considered were also significantly higher compared to pretraining (P 0.001), and relative gains were comprised between 8-10% (spike-counter movement jump) and 21% (squat jump). The significant increases in maximal strength and explosive strength produced by the present training program were subsequently maintained after an additional 2 wk of volleyball training.
