Analyzing surface EMG signals to determine relationship between jaw imbalance and arm strength loss
This study investigated the relationship between dental occlusion and arm strength; in particular, the imbalance in the jaw can cause loss in arm strength phenomenon. One of the goals of this study was to record the maximum forces that the subjects can resist against the pull-down force on their hands while biting a spacer of adjustable height on the right or left side of the jaw. Then EMG measurement was used to determine the EMG-Force relationship of the jaw, neck and arms muscles. This gave us useful insights on the arms strength loss due to the biomechanical effects of the imbalance in the jaw mechanism.
In this study to determine the effects of the imbalance in the jaw to the strength of the arms, we conducted experiments with a pool of 20 healthy subjects of both genders. The subjects were asked to resist a pull down force applied on the contralateral arm while biting on a firm spacer using one side of the jaw. Four different muscles – masseter muscles, deltoid muscles, bicep muscles and trapezoid muscles – were involved. Integrated EMG (iEMG) and Higuchi fractal dimension (HFD) were used to analyze the EMG signals.
The results showed that (1) Imbalance in the jaw causes loss of arm strength contra-laterally; (2) The loss is approximately a linear function of the height of the spacers. Moreover, the iEMG showed the intensity of muscle activities decreased when the degrees of jaw imbalance increased (spacer thickness increased). In addition, the tendency of Higuchi fractal dimension decreased for all muscles.
This finding indicates that muscle fatigue and the decrease in muscle contraction level leads to the loss of arm strength.
- Linderholm, H, Lindqvist, B, Ringqvist, M, Wennström, A (1971) Isometric bite force and its relation to body build and general muscle force. Acta Odont Scand 29: pp. 563-568 CrossRef
- Raadsheer, MC, van Eijden, TMGJ, van Ginkel, FC, Prahl-Andersen, B (2004) Human jaw muscle strength and size in relation to limb muscle strength and size. Eur J Oral Sci 112: pp. 398-405 CrossRef
- Smith, S (1978) Muscular strength correlated to jaw posture and the temporomandibular joint. N Y State Dent J 44: pp. 278-285
- Forgione, AG, Mehta, NR, Westcott, WL (1991) Strength and bite, Part 1: An analytical review. Cranio 9: pp. 305-315
- Chakfa, AM, Mehta, NR, Forgione, AG (2002) The effect of step-wise increases in vertical dimension of occlusion on isometric strength of cervical flexors and deltoid muscles in nonsymptomatic females. Cranio 20: pp. 264-273
- Lee, DS, Wanigaratne, K, Whittle, T, Peck, CC, Murray, GM (157) A method for studying jaw muscle activity during standardized jaw movements under experimental jaw muscle pain. Journal of Neuroscience Methods 157: pp. 285-293 CrossRef
- Wang, K, Lobbezoo, F, Svensson, P, Nielsen, LA (2007) Influence of jaw gape on EMG of jaw muscles and jaw-stretch reflexes. Arch Oral Biol 52: pp. 562-570 CrossRef
- Uchida, S, Iwasaki, LR, Marx, DB, Yotsui, Y, Inoue, H, Nickel, JC (2008) Variations in activities of human jaw muscles depend on tooth-tipping moments. Arch Oral Biol 53: pp. 199-205 CrossRef
- Hansen, LB, Hara, S, Marumo, Y, Miles, T, Svensson, P (2009) Effect of experimental pain on EMG-activity in human jaw-closing muscles in different jaw positions. Arch Oral Biol 54: pp. 32-39 CrossRef
- Ohtsuki, T (1983) Decrease in human voluntary isometric arm strength induced by simultaneous bilateral exertion. Behav Brain Res 7: pp. 165-178 CrossRef
- Arslan, YZ, Adli, MA, Akan, A, Baslo, MB (2010) Prediction of externally applied forces to human hands using frequency content of surface EMG signals. Comput Methods Programs Biomed 98: pp. 36-44 CrossRef
- Claire, M, Sofiane, R, Stephane, P, Alain, V (2009) Recurrence quantification analysis of surface electromyographic signal: Sensitivity to potentiation and neuromuscular fatigue. J Neurosci Methods 177: pp. 73-79 CrossRef
- Robert, S, Jan, S (2005) A new method for quantification of muscular force and fatigue by using surface electromyographical measurements.
- Higuchi, T (1988) Approach to an irregular time series on the basis of the fractal theory. Physica D 31: pp. 277-283 CrossRef
- Vineet, G, Srikanth, S, Narender, PR (1997) Fractal analysis of surface EMG signals from the biceps. Int J Med Inform 45: pp. 185-192 CrossRef
- Analyzing surface EMG signals to determine relationship between jaw imbalance and arm strength loss
- Open Access
- Available under Open Access This content is freely available online to anyone, anywhere at any time.
BioMedical Engineering OnLine
- Online Date
- August 2012
- Online ISSN
- BioMed Central
- Additional Links
- Electromyography (EMG)
- Jaw imbalance
- Arm strength
- Integrated EMG
- Higuchi fractal dimension