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This study assessed the effect of alternate nostril yoga breathing (nadisuddhi pranayama) on P300 auditory evoked potentials compared to a session of breath awareness of equal duration, in 20 male adult volunteers who had an experience of yoga breathing practices for more than three months. Peak amplitudes and peak latencies of the P300 were assessed before and after the respective sessions. There was a significant increase in the P300 peak amplitudes at Fz, Cz, and Pz and a significant decrease in the peak latency at Fz alone following alternate nostril yoga breathing. Following breath awareness there was a significant increase in the peak amplitude of P300 at Cz. This suggests that alternate nostril yoga breathing positively influences cognitive processes which are required for sustained attention at different scalp sites (frontal, vertex and parietal), whereas breath awareness brings about changes at the vertex alone.
BACKGROUND: The characteristics of yoga practitioners and factors motivating people to practice yoga have been studied in the US and in Australia. This study aimed to determine the characteristics of yoga users in India, the factors that motivate them to practice yoga, and the yoga techniques of choice. MATERIALS AND METHODS: The study was a one-time, cross-sectional survey based on convenience sampling. Inclusion criteria were (a) a minimum of 1 week experience of yoga and (b) at least 10 years of age. 14,250 people received the survey. After excluding those who did not meet the inclusion criteria or filled in the survey incompletely or incorrectly, 5,157 respondents were included in the study. RESULTS: Out of 5,157 respondents, there were more males (67.3%), aged between 21 and 44 years (33.7% of the sample surveyed), educated up to high school (62.5%), students (39.3%), and those who had between 1 and 12 months of experience in yoga (54.4%). The first most common reason to practice yoga for all respondents was physical fitness. Three of the remaining reasons to practice yoga differed significantly with age: (i) yoga for disease management (chi(2) = 17.62, p < 0.005), (ii) yoga as a hobby (chi(2) = 10.87, p < 0.05), and (iii) yoga based on the guru's (teacher's) instructions (chi(2) = 20.05, p < 0.001). The yoga technique of choice [i.e., (i) asanas (chi(2) = 23.17, p < 0.001), (ii) pranayama (chi(2) = 19.87, p < 0.001), or (iii) meditation (chi(2) = 9.64, p < 0.05)] differed significantly across age groups. CONCLUSION: In India, a yoga practitioner was more likely to be male, between 21 and 44 years of age, high school educated, and a student. The reasons to practice yoga and the yoga technique of choice differed significantly with age.
BACKGROUND: Walking and yoga have been independently evaluated for weight control; however, there are very few studies comparing the 2 with randomization. MATERIAL AND METHODS: The present study compared the effects of 90 minutes/day for 15 days of supervised yoga or supervised walking on: (i) related biochemistry, (ii) anthropometric variables, (iii) body composition, (iv) postural stability, and (v) bilateral hand grip strength in overweight and obese persons. Sixty-eight participants, of whom 5 were overweight (BMI >/=25 kg/m2) and 63 were obese (BMI >/=30 kg/m2; group mean age +/-S.D., 36.4+/-11.2 years; 35 females), were randomized as 2 groups - (i) a yoga group and (ii) a walking group - given the same diet. RESULTS: All differences were pre-post changes within each group. Both groups showed a significant (p<0.05; repeated measures ANOVA, post-hoc analyses) decrease in: BMI, waist circumference, hip circumference, lean mass, body water, and total cholesterol. The yoga group increased serum leptin (p<0.01) and decreased LDL cholesterol (p<0.05). The walking group decreased serum adiponectin (p<0.05) and triglycerides (p<0.05). CONCLUSIONS: Both yoga and walking improved anthropometric variables and serum lipid profile in overweight and obese persons. The possible implications are discussed.
Students with attention deficit/hyperactivity disorder (ADHD) often do not actively engage in academic instruction because they have difficulty in attending to task demands in the classroom. Without adequate intervention, this may result in poor academic outcomes for these students. In a multiple baseline design study, we taught four 5th-grade students Samatha meditation and assessed active engagement in math instruction and the percentage of math problems correctly solved during baseline, meditation training, and meditation practice phases. Results showed the students had varying but low percentages of intervals of active engagement in math instruction during baseline, but evidenced statistically significant increases from baseline to the meditation practice phase. Similarly, their low but varying percentages of math problems solved correctly during baseline showed statistically significant increases from baseline to the meditation practice phase. These results suggest that Samatha meditation may enhance cognitive processes in students with ADHD at a level to benefit them academically.
State anxiety, somatization of stress, quality of life, self-rated quality of sleep, and discomfort due to over-breathing which occurs when stressed were studied. Out of a total of 140 participants, seventy participants self-selected to be in a yoga group for stress relief (group mean age +/- SD, 33.0 +/- 6.5 years; 37 males). Seventy age and gender matched participants were in a control group. State anxiety, somatization of stress, quality of life, discomfort and self-rated quality of sleep were assessed using the State-Trait Anxiety Inventory, Symptom Checklist-90-R, SF-12, Nijmegen Discomfort Evaluation Scale and a Sleep Rating Questionnaire respectively. Assessments were made at the beginning and end of the week. Repeated measures ANOVAs with Bonferroni adjusted post-hoc analyses showed a significant decrease in state anxiety (P < 0.001), somatization of stress (P < 0.01), improved health-related quality of life (P < 0.01), self-rated quality of sleep (P < 0.01), and decrease in discomfort due to over-breathing (P < 0.001). No changes (except decreased discomfort due to over-breathing; P < 0.01) occurred in the control group. This study suggests that a brief yoga program may be beneficial in decreasing anxiety, somatization of stress and discomfort, improving health-related quality of life and self-rated sleep quality.
State anxiety, somatization of stress, quality of life, self-rated quality of sleep, and discomfort due to over-breathing which occurs when stressed were studied. Out of a total of 140 participants, seventy participants self-selected to be in a yoga group for stress relief (group mean age +/- SD, 33.0 +/- 6.5 years; 37 males). Seventy age and gender matched participants were in a control group. State anxiety, somatization of stress, quality of life, discomfort and self-rated quality of sleep were assessed using the State-Trait Anxiety Inventory, Symptom Checklist-90-R, SF-12, Nijmegen Discomfort Evaluation Scale and a Sleep Rating Questionnaire respectively. Assessments were made at the beginning and end of the week. Repeated measures ANOVAs with Bonferroni adjusted post-hoc analyses showed a significant decrease in state anxiety (P < 0.001), somatization of stress (P < 0.01), improved health-related quality of life (P < 0.01), self-rated quality of sleep (P < 0.01), and decrease in discomfort due to over-breathing (P < 0.001). No changes (except decreased discomfort due to over-breathing; P < 0.01) occurred in the control group. This study suggests that a brief yoga program may be beneficial in decreasing anxiety, somatization of stress and discomfort, improving health-related quality of life and self-rated sleep quality.
BACKGROUND High-frequency yoga breathing (breath rate of 2.0 Hz) has been associated with changes in oxy-hemoglobin in the prefrontal region of the brain. The present study assessed the effects of high-frequency yoga breathing (HFYB) at 1.0 Hz on frontal oxy-hemoglobin (oxy-Hb) and deoxy-hemoglobin (deoxy-Hb). MATERIAL AND METHODS Forty healthy male participants were recruited for the study. The experimental group consisted of 20 participants 23-40 years old (group mean +/-S.D., 26.4+/-4.7 years) with at least 3 months of experience performing HFYB (group mean +/-S.D., 16.3+/-9.8 months). The control group consisted of 20 participants ages 23-38 years (group mean age +/- S.D., 27.4+/-4.1 years), who were seated quietly for the same duration and their average experience of yoga practice was (+/-S.D.) 4.3+/-2.7 months. Each participant in the experimental group was assessed at 2 sessions (HFYB and breath awareness [BAW]) on alternate days. Hemodynamic changes were assessed using a functional near-infrared spectroscopy sensor placed over the forehead. Data were analyzed using repeated-measures analyses of variance followed by post hoc Bonferroni adjustment. RESULTS A significant reduction was observed in oxy-Hb during and after HFYB on the left and right sides compared to values before. We also found a significant reduction in deoxy-Hb during and after the quiet sitting control session compared to pre-session values on left and right sides. CONCLUSIONS The decrease in oxy-Hb during and after HFYB suggests that there was no frontal activation during HFYB when practiced at the rate of 1.0 Hz.
The present study was conducted to assess the immediate effect of high-frequency yoga breathing on muscle strength and motor speed. Bilateral handgrip strength, leg and back strength, finger tapping and arm tapping speed were assessed in fifty male participants (group mean age +/- SD, 26.9 +/- 6.2 years) before and after (a) high frequency yoga breathing for 15 minutes and (b) breath awareness for the same duration. Sessions (a) and (b) were on two different days but at the same time of the day. The schedule was alternated for different participants. There was a significant increase (P < 0.05) in right hand grip strength after high frequency yoga breathing. Both finger and arm tapping improved after both practices. The results suggest a role for high frequency yoga breathing in improving the hand grip strength as an immediate effect.
BACKGROUND Practicing high-frequency yoga breathing (HFYB) induced a hypermetabolic state in a single subject during the practice but the effect has not been studied in multiple practitioners. MATERIAL AND METHODS Healthy male volunteers (n=47, group mean age +/- S.D., 23.2 +/- 4.1 years) were recruited as an experimental group and another twenty volunteers were recruited as a control group. The experimental group practiced either HFYB (Breath rate 1.0 Hz) or breath awareness (BAW) on two separate days. The sequence was reversed for alternate participants. The control group was assessed under similar conditions while sitting at ease. The breath rate (RR), tidal volume (VT), ventilation (VE), VO2, VCO2, arterial PCO2 and energy expenditure (EE Kcal/day) were assessed for 35 minutes using an open circuit oxygen consumption analyzer. The assessment period was divided into before, during and after conditions. Repeated measures analyses of variance (ANOVA) were used to compare data recorded during and after the two practices with data recorded before. Before-After comparisons in the control group were with paired t-tests. RESULTS The most relevant significant changes were increases in VE, VO2, VCO2 and EE during HFYB, while the same variables decreased during the control period. However after HFYB there was no change in VO2 or EE, although VE decreased as it did after the control period. CONCLUSIONS HFYB induces a hypermetabolic state for the duration of the practice which returns to baseline after HFYB suggesting a possible application for HFYB in hypometabolic states.
Both aqueous and methanolic fractions derived from the Tibetan preparation PADMA-28 (a mixture of 22 plants) used as an anti-atherosclerotic agent, and which is non-cytolytic to a variety of mammalian cells, were found to strongly inhibit (1) the killing of epithelial cells in culture induced by 'cocktails' comprising oxidants, membrane perforating agents and proteinases; (2) the generation of luminol-dependent chemiluminescence in human neutrophils stimulated by opsonized bacteria; (3) the peroxidation of intralipid (a preparation rich in phopholipids) induced in the presence of copper; and (4) the activity of neutrophil elastase. It is proposed that PADMA-28 might prove beneficial for the prevention of cell damage induced by synergism among pro-inflammatory agonists which is central in the initiation of tissue destruction in inflammatory and infectious conditions.
There is a growing interest in the use of mindfulness-based interventions (MBI) on youth, which has recently expanded to include the study of students in school settings. This article systematically reviewed the existing literature of applied studies using MBI with students in school settings in order to identify limitations in the scientific literature and inform future research directions. Twenty-eight studies were selected for review and were coded across multiple domains, including methodologies employed, student characteristics, intervention characteristics, and outcome variables. Results quantitatively summarized the coded variables, and strengths and limitations in the literature were subsequently identified. We conclude with specific recommendations for future interventions scientists wishing to study the utility of MBI in school settings.
There is a growing interest in the use of mindfulness-based interventions (MBI) on youth, which has recently expanded to include the study of students in school settings. This article systematically reviewed the existing literature of applied studies using MBI with students in school settings in order to identify limitations in the scientific literature and inform future research directions. Twenty-eight studies were selected for review and were coded across multiple domains, including methodologies employed, student characteristics, intervention characteristics, and outcome variables. Results quantitatively summarized the coded variables, and strengths and limitations in the literature were subsequently identified. We conclude with specific recommendations for future interventions scientists wishing to study the utility of MBI in school settings.