| 1. |
- Alghadir, Ahmad, et al.
(författare)
-
Effect of chewing on postural stability during quiet standing in healthy young males
- 2015
-
Ingår i: Somatosensory & motor research. - : Informa UK Limited. - 0899-0220 .- 1369-1651. ; 32:2, s. 72-76
-
Tidskriftsartikel (refereegranskat)abstract
- Background and aims: There is an important role of the neck sensory motor system in control of body posture and balance, and it is reasonable to believe that the jaw sensory motor system can directly and indirectly influence the modulation of the postural control system. The purpose of this study was to evaluate possible effects of dynamic jaw position while chewing on the postural control system. Materials and methods: We compared the mean center of gravity (COG) velocity during quite standing on a foam surface with eyes closed during three test conditions: (i) with resting jaw position, (ii) with open jaw position, and (iii) while chewing standard bolus of chewing gum. One hundred and sixteen normal healthy male subjects (average age 31.56 +/- 8.51 years; height 170.86 +/- 7.26 cm) were recruited for the study. Their COG velocity (deg/s) was measured using the NeuroCom (R) Balance Master Version 8.5.0 (Clackamas, OR, USA). Statistical analysis: Data was tested by the Friedman test. Results and conclusions. The results show that COG velocity decreased significantly while chewing in comparison to both open and resting jaw position (p < 0.0001). Our finding corroborates previous studies and suggests that the jaw sensory motor system can modulate postural control mechanisms. Gum chewing activity can enhance the postural stability during upright standing on an unstable surface and in the absence of visual input in healthy young adults. Our results should be taken into consideration in treatment and rehabilitation planning for patients with postural instability.
|
|
| 2. |
- Alghadir, Ahmad, et al.
(författare)
-
Effect of face veil on ventilatory function among Saudi adult females
- 2012
-
Ingår i: Pakistan journal of medical sciences print. - 1682-024X .- 1681-715X. ; 28:1, s. 71-74
-
Tidskriftsartikel (refereegranskat)abstract
- Objective: The use of face veil called "niqab" by women to cover their faces at public places is a common practice in some Muslim communities. The long-term effect of niqab use on ventilatory function (VF) has not previously been reported. The aim of this cross-sectional study was to compare VF between niqab wearing and non-niqab wearing healthy Saudi females. Methodology: Thirty eight healthy adult Saudi females participated in this study. Nineteen subjects were regular niqab users and the other nineteen were either not using niqab at all or used it for less than one hour per day. Forced vital capacity (FVC), forced expiratory volume in one second (FEV1), FEV1/FVC (%), and maximal voluntary ventilation (MVV) were recorded using a digital spirometer. Results: Mean values of FVC, FEV1, FEV1/FVC (%) and MVV for niqab wearers were significantly lower than the corresponding values for non-niqab wearers. Significant negative correlation was found between the FVC and FEV1 values and the number of hours of the use of face veil per day. Conclusions: Long-term use of traditional niqab use can affect VF.
|
|
| 3. |
- Alghadir, Ahmad, et al.
(författare)
-
Effect of sitting postures and shoulder position on the cervicocephalic kinesthesia in healthy young males
- 2016
-
Ingår i: Somatosensory & motor research. - : Informa UK Limited. - 0899-0220 .- 1369-1651. ; 33:2, s. 93-98
-
Tidskriftsartikel (refereegranskat)abstract
- Information about head orientation, position, and movement with respect to the trunk relies on the visual, vestibular, extensive muscular, and articular proprioceptive system of the neck. Various factors can affect proprioception since it is the function of afferent integration, and tuning of muscular and articular receptors. Pain, muscle fatigue, and joint position have been shown to affect proprioceptive capacity. Thus, it can be speculated that changes in body posture can alter the neck proprioception. This study was undertaken to investigate the effect of body posture on cervicocephalic kinesthetic sense in healthy subjects. Cervicocephalic kinesthetic sensibility was measured by the kinesthetic sensibility test in healthy young adults while in (a) habitual slouched sitting position with arms hanging by the side (SS), (b) habitual slouched sitting position with arms unloaded (supported) (SS-AS), and (c) upright sitting position with arms hanging by the side (US) during maximum and 30 degree right, left rotations, flexion, and extension. Thirty healthy male adults (mean age 27.83; SD 3.41) volunteered for this study. The least mean error was found for the SS-AS position (0.48; SD 0.24), followed by SS (0.60; SD 0.43) and US (0.96; SD 0.71), respectively. For all test conditions, there was significant difference in mean absolute error while head repositioning from maximum and 30 degree rotation during SS and SS-AS positions (p<0.05). In conclusion, body posture can affect the proprioception function of the neck. Supporting the upper extremities in such a way that their weight is unloaded, which leads to reduction in the tension between the neck and shoulder girdle, can improve cervicocephalic kinesthetic sense in both the horizontal and vertical planes. The findings of this study can be implemented in people who have to do repeated arm and neck movements, by using ergonomically effective chairs with proper arm supports. This might help in prevention and treatment of neck pain.
|
|
| 4. |
- Alghadir, Ahmad, et al.
(författare)
-
Effect of upright and slouch sitting postures and voluntary teeth clenching on hand grip strength in young male adults
- 2017
-
Ingår i: Journal of Back and Musculoskeletal Rehabilitation. - : IOS PRESS. - 1053-8127 .- 1878-6324. ; 30:5, s. 961-965
-
Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Estimation of handgrip strength (HGS) is routinely used by clinicians and epidemiologists for objective assessment of functional status of hand and upper extremity. It is also used as an indirect indicator of overall physical strength and health status in variety of clinical situations and chronic general medical conditions. OBJECTIVE: The present study was conducted to examine the effects of upright and slouch sitting postures and voluntary teeth clenching on hand grip strength in healthy young male subjects. METHODS: One hundred healthy young males (aged 18-30 years) participated in this study. The HGS was measured using a commercially available dynamometer for the dominant hand. The HGS was measured during four test conditions; (a) slouch sitting without teeth contact, (b) slouch sitting with teeth clenching, (c) upright sitting without teeth contact, and (d) upright sitting with teeth clenching. RESULTS: The HGS values were significantly higher during slouch than upright sitting posture, both during similar and opposite teeth related conditions (p < 0.001). Teeth clenching had no effect on the in HGS values during slouch or upright sitting posture (P > 0.05). CONCLUSIONS: As compared to upright sitting, higher HGS values can be obtained during slouch sitting in young healthy males. Teeth clenching does not affect the HGS values during slouch or upright sitting posture.
|
|
| 5. |
- Alghadir, Ahmad H., et al.
(författare)
-
Can jaw position affect the fine motor activity of the hand during writing?
- 2020
-
Ingår i: Brain and Behavior. - : John Wiley & Sons. - 2162-3279 .- 2162-3279. ; 10:12
-
Tidskriftsartikel (refereegranskat)abstract
- Background: Jaw and neck systems have been shown to be functionally related and changes in either system can modulate gross motor functions, such as posture control. It remains to be seen if any change in jaw position can affect fine motor skills. The objective of this study was to determine the effect of resting, open and clenched jaw positions on various handwriting parameters while standing on firm and unstable surfaces.Methods: Handwriting samples were collected from 36 healthy male participants (age, 15-35 years) using a digitizer tablet (WACOM Intuos 4) with noninking pen in the resting, open and clenched jaw positions while standing on firm and unstable surfaces. The measured handwriting parameters included duration, vertical size, horizontal size, absolute size, average absolute velocity, and absolute jerk. Recordings and analyses were performed using NeuroScript MovAlyzeR software.Results: All handwriting parameters varied among the resting, open, and clenched jaw positions on both the firm and unstable surfaces. However, based on statistical analyses, there were no significant differences in the handwriting parameters among three jaw positions on both surfaces (p > .05).Conclusion: This study revealed that all handwriting parameters varied among the resting, open, and clenched jaw positions on both the firm and unstable surfaces, showing that change in the jaw motor system may potentially affect the fine motor skills. However, on statistical analysis, there was no significant effect of 3 studied jaw positions on fine motor skills as seen on gross motor skills among healthy individuals.
|
|
| 6. |
- Alghadir, A. H., et al.
(författare)
-
Effect of localised vibration on muscle strength in healthy adults : a systematic review
- 2018
-
Ingår i: Physiotherapy. - : Elsevier. - 0031-9406 .- 1873-1465. ; 104:1, s. 18-24
-
Forskningsöversikt (refereegranskat)abstract
- Objective To investigate the effects of local vibration on muscle strength in healthy adults.Data sources The electronic databases PubMed, CINAHL, Scopus and Web of Science were searched using a combination of the following keywords: vibration, vibration therapy, power, maximal voluntary contraction, performance, rate of force development and vibratory exercise. In addition, the Medical Subject Headings 'vibration', 'strength' and 'exercise' were used. The bibliographical search was limited to articles published in English.Study selection Trials that evaluated the effect of localised vibration on muscle strength in healthy humans were included.Data extraction Two independent evaluators verified the quality of the selected studies using the PEDro Scale and the Cochrane Collaboration's tool for assessing the risk of bias. Muscle strength was calculated for each intervention.Results In total, 29 full-text studies were assessed for eligibility. Eighteen studies did not match the inclusion criteria, and were excluded. The 11 studies included in this review had an average PEDro score of 5.36/10. Most of the studies reported significant improvements in muscle strength after the application of local vibration. There was considerable variation in the vibration training parameters and target muscle location.Conclusions The use of local vibration on the target muscle can enhance muscle strength in healthy adults. Further well-designed controlled studies are required to confirm the effect of local vibration training on muscle strength.
|
|
| 7. |
- Alghadir, A. H., et al.
(författare)
-
Effect of quadriceps and hamstrings muscle cooling on standing balance in healthy young men
- 2017
-
Ingår i: Journal of Musculoskeletal and Neuronal Interactions - JMNI. - : JMNI. - 1108-7161. ; 17:3, s. 176-182
-
Tidskriftsartikel (refereegranskat)abstract
- Objective: The present study compared the effect of quadriceps and hamstring muscle cooling on standing balance in healthy young men.Methods: Thirty healthy young men (18-30 years) participated in the study. The participants were randomly assigned to three groups (n=10 each): quadriceps cooling (QC), hamstring cooling (HC), or control group (no cooling). Participants in the QC and HC groups received 20 minutes of cooling using a cold pack (gel pack), placed on the anterior thigh (from the apex of the patella to the mid-thigh) and the posterior thigh (from the base of the popliteal fossa to the mid-thigh), respectively. Balance score including unilateral stance was measured at baseline and immediately after the application of the cold pack.Results: No significant difference in the balance score was noted in any group after the application of the cold pack (p>0.05). Similarly, no significant differences in post-test balance score were noted among the three groups (p>0.05).Conclusions: Cooling of the quadriceps and hamstring muscles has no immediate effect on standing balance in healthy young men. However, longitudinal studies are warranted to investigate the long-term effects of cooling these muscles on standing balance.
|
|
| 8. |
- Alghadir, Ahmad H., et al.
(författare)
-
Effect of three different jaw positions on postural stability during standing
- 2015
-
Ingår i: Functional Neurology. - 0393-5264 .- 1971-3274. ; 30:1, s. 53-57
-
Tidskriftsartikel (refereegranskat)abstract
- Studies in the literature show that jaw and neck regions are linked anatomically, biomechanically and neurologically. Voluntary clenching has been shown to improve muscle strength and performance of various motor tasks. Information from the neck sensory-motor system is reported to be important for posture. Hence it is reasonable to believe that activation of the jaw sensory-motor system has the potential to modulate posture. In a sample of 116 healthy subjects, we compared center of gravity (COG) velocity during quiet standing on a foam surface during three test positions: i) resting jaw, ii) open jaw, and iii) clenching; these were tested in two conditions: with eyes open and with eyes closed. The COG velocity decreased significantly during clenching in comparison to both open and resting jaw positions (p<0.0001). This suggests that the jaw sensory-motor system can modulate postural mechanisms. We conclude that jaw clenching can enhance postural stability during standing on an unstable surface in both the presence and absence of visual input in healthy adults and suggest that this should be taken into consideration in treatment and rehabilitation planning for patients with postural instability.
|
|
| 9. |
- Alghadir, Ahmad H., et al.
(författare)
-
Effect of tongue position on postural stability during quiet standing in healthy young males
- 2015
-
Ingår i: Somatosensory & motor research. - : Informa UK Limited. - 0899-0220 .- 1369-1651. ; 32:3, s. 183-186
-
Tidskriftsartikel (refereegranskat)abstract
- Background and aims: Role of the neck and jaw sensory motor system in control of body balance has been established. Tongue is an integral part of jaw sensory motor system and helps in execution of purposeful and precise motor tasks like eating, drinking and speaking. The purpose of this study was to evaluate the possible effects of tongue position on the postural control system. Materials and method: We compared the mean center of gravity (COG) velocity during quiet standing on an unstable surface with eyes closed during two test conditions: (i) with habitual jaw resting position and (ii) with instructed tongue positioned against the upper incisors. One hundred and sixteen normal healthy male subjects (average age 31.56 +/- 8.51 years and height 170.86 +/- 7.26 cm) participated in the study. Their COG velocity (deg/s) was measured using the NeuroCom (R) Balance Master version 8.5.0 (Clackamas, OR, USA). Results and conclusions: The results show that COG velocity decreased significantly while tongue was positioned against upper incisors in comparison to the habitual jaw resting position. Our findings suggest that the tongue positioning can modulate postural control mechanisms. Tongue positioning against the upper incisors can enhance the postural stability during upright standing on an unstable surface and in the absence of vision in healthy young adults. Our findings can be of value for evaluation and rehabilitation protocols for postural control dysfunction.
|
|
| 10. |
- Alghadir, Ahmad H., et al.
(författare)
-
Effect of voluntary teeth clenching and sitting posture on maximal static force of limb muscles
- 2019
-
Ingår i: Journal of Sports Medicine and Physical Fitness. - Turin : Edizioni Minerva Medica. - 0022-4707 .- 1827-1928. ; 59:5, s. 774-778
-
Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: People clench their teeth to activate facial, neck and abdominal muscles when they need to generate heavy muscle force against large resistance like lifting heavy objects, in order to gain possible ergogenic advantage. These are termed as remote voluntary contractions. Aim of this study was to evaluate the effect of voluntary teeth clenching on maximal voluntary contraction of extensors and flexors of the knee, shoulder and elbow joints of the dominant side during slouch and unsupported upright sitting.METHODS: One hundred healthy young male adults (mean age 23.3 years) participated in this study. Maximal voluntary contraction was measured using a hand-held dynamometer.RESULTS: Jaw clenching caused different ergogenic effect during slouch versus unsupported sitting postures. The data revealed that during unsupported upright sitting, the effect of jaw clenching consistently results in larger maximal voluntary contraction of both extensor and flexor muscles of all the three studied joints. However, during slouch sitting, only the maximal voluntary contraction of extensors of elbow and flexors of knee were larger with clenched teeth position.CONCLUSIONS: Jaw clenching can affect the maximal voluntary contraction of limb muscles which is sitting posture dependent. Jaw clenching can consistently facilitate certain muscles of the upper and lower limbs to generate greater force production during upright sitting.
|
|
