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Year : 2011  |  Volume : 4  |  Issue : 2  |  Page : 93-99
Effect of integral yoga on psychological and health variables and their correlations

1 Department of Yoga and Life Sciences, Swami Vivekananda Yoga Anusandhana Samsthana (SVYASA), Bangalore, India
2 Institute of Ayurveda and Integrative Medicine, Bangalore, India

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Date of Web Publication27-Sep-2011


Objective: Certain psychological and health variables are commonly measured in India. This study evaluates the effects of integral yoga practices on these variables and also the consistency of correlations observed between them.
Materials and Methods: The study was a pre-post intervention study. The variables were measured at the beginning and the end of a one-month yoga course. There was no control group.The study was carried out at Swami Vivekananda Yoga Anusandhana Samsthana (S-VYASA) University, in its rural campus south of Bangalore. Based on health criteria, 108 subjects were selected out of 198 volunteers to form the experimental yoga group. Ages ranged from 17 to 63 years. The yogasanas (postures), pranayama (breathing exercises), relaxation techniques, meditation, chanting and lectures were the components of yoga intervention. The variables measured were sustained attention, emotional intelligence - EQ, general health - GHQ, guna personality - sattva, rajas and tamas.
Results: Significant pre-post changes were found in all variables. Significant correlations were found between the following pairs: The two sustained attention variables; emotional intelligence and general health; GHQ and tamas; sattva and tamas; and rajas and tamas.
Conclusion: The study shows that there were significant changes in all variables (P< 0.001) except in sattva. It also confirms that EQ and general health variables correlate significantly with each other and negatively with tamas. EQ and tamas form positive and negative predictors of health respectively. Sattva correlates positively with EQ suggesting that a sattvic personality indicates better self-control. This suggests that, by improving guna personality, long-term yoga practice may stabilize EQ.

Keywords: Emotional intelligence; gunas; psychological; yoga.

How to cite this article:
Khemka SS, Ramarao NH, Hankey A. Effect of integral yoga on psychological and health variables and their correlations. Int J Yoga 2011;4:93-9

How to cite this URL:
Khemka SS, Ramarao NH, Hankey A. Effect of integral yoga on psychological and health variables and their correlations. Int J Yoga [serial online] 2011 [cited 2023 Mar 27];4:93-9. Available from:

   Introduction Top

Yoga is widely practiced for its benefits to body and mind. Yoga therapeutics is an increasingly appreciated discipline, particularly in India where it is overseen by the Ministry of Health and Family Welfare's Department of Ayurveda, Yoga and Naturopathy, Unani, Siddha and Homeopathy (AYUSH). Not many studies have assessed the influence of integral yoga practices on psychological and health variables, establishing many possible benefits. This study apart from establishing the benefits of internal yoga investigates the relationships between the variables themselves. Up till now, this correlation aspect has not been much investigated, since this requires simultaneous measuring of many variables for a large group, and then to correlate. The aim of the present study is to begin to remedy this deficiency. It measured many variables on a group of volunteers large enough to identify significant correlations between variables. Specifically it evaluated correlations between measures of sustained attention, emotional intelligence, general health and guna personality before and after a one-month Yoga instructor's course.

Sustained attention is the capacity to attend to a task for a required period of time. The ability may be related to steadiness of focus, which in turn is a sign of mental stability. Sustained attention may thus depend on emotionality.

A self-controlled study on 20 male volunteers measured immediate effects of three yoga-breathing techniques on performance of a letter cancellation task (LCT). [1] Practice of alternate nostril yoga breathing (Nadi suddhi pranayama) and right nostril yoga breathing (Surya anuloma pranayama) improved task performance. No significant change was observed following left nostril breathing, or simple breath awareness. The authors concluded that anxiety-reducing effects of pranayama might have contributed to better LCT performance, since this requires selective attention.

Patil and Telles [2] measured the effects of two yoga-based relaxation techniques on six letter cancellation (SLC) test performance, a task requiring selective attention, concentration, visual scanning abilities and repetitive motor response. Cyclic meditation brought about a greater improvement than supine rest again suggesting anxiety reduction.

Khemka et al,[3],[4] in a two separate control studies measured immediate effects of two relaxation techniques and immediate effect of Kapalbhati and breath awareness on healthy volunteers on performance of SLC task and digit letter substitution (DLS) task and found significant increase in both task performances of attention in all four interventions of two studies.

Emotional intelligence has been variously defined as "the ability to control one's own and other's feelings and emotions, to discriminate amongst them, and to use this information to guide one's thinking and actions", [5] "… the capacity for recognizing our own feelings and those of others, for motivating ourselves, and for managing emotions well in ourselves and in relationships." [6] Goleman claims that about 80% of a person's success in life depends on emotional competencies as measured by EQ. [7]

A controlled study of 170 subjects by Kumari et al,[8],[9] assessed the effects of a six week part-time self management of excessive tension (SMET) program for managers on their emotional well-being. EQ scores increased significantly on four of the five subscales.

General health is not just absence of disease, but is well being on physical, mental and social levels. [10] Many studies have found improvements due to yoga practice. A small randomized control trial of sahaja yoga[11] evaluated effects on depressive disorders. Anxiety and depression scores reduced more in the yoga group. In a study of Yoga's effects on distress symptoms in survivors of the 2005 tsunami, [12] self-rated fear, anxiety, sadness and disturbed sleep decreased significantly along with heart and breathing rates for indigenous people. A review of Sudarshan Kriya Yoga for stress, anxiety, and depression concluded that the technique enhances well being, mood, attention, mental focus and stress tolerance, [13] and seems beneficial as a low risk, low cost adjunct to treatment of many conditions, and for criminal rehabilitation. A study of hatha yoga's effects in 107 healthy adults found improved physical and mental health and well-being. [14]

A controlled pilot study evaluating a comprehensive yogic breathing program observed reduced anxiety, depression and stress, and increased optimism in the experimental group. [15] An RCT comparing meditation stress-management and education programs as adjuncts to pharmacotherapy for anxiety disorder found reduced anxiety and depression. [16] These results consistently find that professionally administered yoga programs improve many health variables.

Guna personality variables are three Vedic personality patterns named sattva, rajas and tamas: Sattva brings calmness, lightness, illumination, control, and the beginning of selflessness, all triggering constructive action; rajas is a more compulsive tendency to action and selfishness, producing pain, and a restless mind; tamas manifests as lethargy, drowsiness or sleepiness, blocks, and stagnation. According to Vedic psychology, these gunas constantly control a person's tendencies: "Everyone is helplessly driven to action by the gunas". [17]

An evaluation of yoga's impact on the gunas, and on self-ideal disparity [18] found significant correlations between self and ideal self for the yoga group, but not for controls. Tamas was associated with disparity between self and ideal self. Another study [19] found that the Hare Krishna mantra increased sattva and decreased rajas and tamas. Generally, Yoga aims to improve guna quality, until sattva dominates all the time. [20]

Correlations between attention and gunas: gunas are related to cognitive characteristics, [21] perceptual acuity and field independence, [22] intelligence, memory, and attention-concentration. [23] Negative correlations are reported between tamas and field independence, short-term memory, intelligence and attention-concentration, and positive correlations between sattva and general intelligence, short-term memory and attention-concentration. Ability to focus attention correlates positively with sattva, and negatively with tamas.

Correlations between EQ and gunas have been studied by Kumari et al.[24] Finding none, they concluded that the two are distinct personality concepts.

Correlations between health and gunas: A study of rajas and tamas in psychological disturbance found the two predominant factors in the patient population, [25] suggesting that elevated levels of rajas and tamas give rise to mental ill health. It is generally agreed that predominance of rajas and tamas leads to psychological disturbance. Sattva guna, on the other hand, leads to positive mental health and optimal functioning. It embodies spiritual values, considered to take subjects beyond mental health problems. Similarly, a study of 100 cancer patients found that patients high in rajas or tamas are more prone to cancer. [26]

On the other hand, an RCT on gunas and health [27] found sattva improved more in the yoga group than in controls. Rajas reduced significantly in the physical exercise (control) group. General health status improved in both groups, consistent with the finding that, while sattva correlates positively with health, rajas correlates negatively. Based on previous studies on various variables and their correlations, we give below details of different tests by which these variables are measured.

The tests

The SLC and DLS tests assess selective, focused and sustained attention, visual scanning and activation and inhibition of rapid responses. Psychomotor performance is a complex phenomenon. The tests identify major components of performance: Detection, perception, recognition, processing and integration. They have previously been used on the Indian population.

N. K. Chadha developed the adapted emotional intelligence (EQ) test in 2003 as discussed by Dalip Singh. [28] He compiled situations experienced by people in real life situations deemed neutral with regard to social desirability, and selected to avoid response bias.

The general health questionnaire (GHQ-28) [29] contains 28 items in four 7-item sub-scales: A-somatic symptoms, B-anxiety/insomnia, C-social dysfunction, and D-severe depression. The test examines recent mental status, identifying possible psychiatric disturbance.

The guna-based personality test [30] uses an inventory of 88 items, characteristic of sattvic, rajasic and tamasic personalities collected from the literature. [23]

No previous study has evaluated the effect of integral Yoga in a residential set up on healthy volunteers and consistency of correlations between these variables before and after a yoga intervention and hence this study was undertaken.

   Materials and Methods Top

Subjects comprised 108 healthy volunteers (male and female, aged 17-63 years, mean 31 ΁ 10.75) attending one-month, residential, Yoga Instructor's Courses at Swami Vivekananda Yoga Anusandhana Samsthana (SVYASA), Bangalore during August 2005 and February 2006.

Inclusion criteria

Healthy student volunteers attending Yoga instructor courses.

Exclusion criteria

Poor health as indicated by personal data, taking medication, or initial GHQ value over 5.


Subjects were assessed in a single group before and after the yoga practice.


An integrated approach to yoga therapy (IAYT) module includes yogasanas, pranayama, meditation, kriyas, lectures, singing, and yogic games. Each 45-60 min session was taught by qualified instructors and teachers. Lecture topics included the four paths of yoga, pancha-koshas, diet, and stress management. [31],[32],[33]


Subjects took the five tests named below in a single sitting at the same time of day immediately before and after the one-month yoga training period. They were not allowed to talk after receiving test sheets, and instructed to remain in place until everyone had finished, so as not to disturb others.

  • Six letter cancellation (SLC) test.
  • Digit letter substitution (DLS) test.
  • Emotional intelligence (EQ) test.
  • General health questionnaire (GHQ) test.
  • Guna personality (tamas, rajas, sattva) test

The SLC test comprises a worksheet specifying six target letters to be cancelled from a working section of 22 rows by 14 columns randomly arranged letters of the alphabet. Subjects are asked to cancel as many target letters as possible in 90 s.

The DLS test consists of a similar test worksheet, containing a key, pairing digits 1-9 with letters of the alphabet. The working section displays 12 rows Χ 8 columns of randomized digits. Subjects are asked to substitute as many target digits as possible in 90 s. A similar digit letter substitution task has been used on an Indian population confirming its validity to study immediate effects. The two tests are standard measures of attention span.

Chadha's EQ test consists of 15 questions, based on 15 socially neutral situations, offering five possible answers for each carrying scores 0-20. Total scores are converted into percentiles. Interpretation is as follows:

The test was standardized on broad populations in Indian society; hence it is used here. Retest reliability: 0.94; test validity 0.78. [28]

The GHQ 28 questionnaire provides individual diagnostic profile information: Four 7-item sub-scales are based on factor analysis, with factor structures consistent with the original studies. [34] Internal consistency, and reliability: Cronbach's alpha, 0.85, and validity, 0.76. [25],[29]

It has no thresholds for individual sub-scales. Hence, the total of all sub-scales was used. All items have a 4 point scoring system: 'better than usual', 'same as usual', 'worse than usual', and 'much worse than usual', scored: 0-0-1-1. [35]

Pathak et al,[30] developed a triguna-based personality test, with items taken from guna depictions in Sankhya Karika.[36] It consists of 88 items: 24 sattva, 34 rajas and 30 tamas, scored on a five point scale ranging from 'not at all' to 'very much'. Low between scale correlations were reported. Test reliability coefficients were reported: sattva r =0.62, rajas r =0.83 and tamas r =0.70. Population norms, percentiles and categorizations were given.

Data analysis was carried out using SPSS-10.

   Results Top

Data were first analyzed for normality using the Kolmogorov-Smirnov test. This found SLC, EQ, tamas, rajas and sattva pre-data to be normally distributed (P > 0.05), while those of DLS, EQ, and GHQ were not normally distributed (P < 0.05). The effect of integral yoga on each variable is shown in [Table 1]. Correlation coefficients and their significance are given in [Table 2],[Table 3],[Table 4] where results for each class of data are presented.
Table 1: Pre-post mean, SD, % change and P value of each variable n=108

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Table 2: Correlations of emotional intelligence (EQ)

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Table 3: Correlations of general health (GHQ) and gunas

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Table 4: Correlations between gunas

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The effect of integral yoga practices shows significant improvement in all the variables but not much in sattva. Improvement in sustained attention, emotional intelligence, general health and rajas changes were at P< 0.001 significant level while tamas at P< 0.01 significant level and sattva at P<0.447 insignificant level after integral yoga practices as shown in [Table 1].

Correlation coefficients range from -1.00 to +1.00, extreme values indicating a precise algebraic relationship. Similar measures are highly correlated - for the two measures of sustained attention, SLC and DLS: Positive (P < 0.001) both before (r = 0.616) and after (r = 0.55) the intervention. Correlations between these and other variables were not correlated consistently before and after e.g. SLC was significantly correlated only before the intervention with EQ, tamas and sattva (P< 0.05), while DLS was significantly correlated only after the intervention with EQ (P < 0.05), a curious inconsistency.

[Table 2],[Table 3],[Table 4] list correlations among the other variables. [Table 4] gives internal correlations of gunas. Sattva correlated negatively with tamas while rajas correlated consistently with tamas before and after yoga (see below, discussion section).

Finally, since pre and post intervention data are available, we present correlations between pre- and post-data for each variable in [Table 5].
Table 5: Pre-post correlations r and P values for each variable

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   Discussion Top

The results of the effect of the integral yoga practices on psychological and health variables showed significant improvement in all measures except sattva guna where improvement did not reach significant level.

Deshpande et al,[27] measured the same health variables (GHQ) and guna variables in a randomized control trial in normal healthy volunteers in Bangalore city and found significant improvement (P<0.001) on all the four domains in both Yoga and exercise groups while increase in sattva in both the groups and decrease of rajas and tamas in yoga and physical exercise group after the intervention in a non residential set up with daily 1 h classes for eight weeks.

GHQ is scored according to negative health findings and so negative percentage value indicated tendencies to better health. Both Deshpande et al,[27] scores of GHQ and gunas were almost in line with the result of this study. Similarly sustained attention (SLC and DLS) scores of Khemka et al,[3],[4] controlled studies of integral yoga practices on healthy volunteers were also in lines with the result of this study.

A controlled study of Kumari et al[8],[9] who assessed emotional intelligence (EQ) on corporate managers giving intervention of cyclic meditation found significant increase in EQ as in this study of integral yoga practices.

The results of all above studies on various psychological and health variables show beneficial effect of yoga practices in healthy volunteers. Therefore, one may conclude that yoga imparts significant benefits to healthy people also.

In correlation studies, pairs of variables are usually correlated if there is overlap between the various brain regions that each involves, even secondarily. Sustained attention variables, though well correlated with each other, do not correlate significantly with most other variables. The reason is probably that there is little overlap between the principal brain regions utilized. Sustained attention is primarily governed by cortical areas concerned with various stages of cognition.

In healthy subjects, cortical areas concerned with variables like EQ and health are only secondarily involved. Sustained attention is strongly dependent on tamas probably due to common influence of stress, anxiety or depression, on both task performance and personality. Cognitive processing is mostly cortical, but emotions and imbalances are more connected to mid-brain centers, which also modulate cortical function. Negative influence on these centers will have corresponding effects on cortical function. Sattva on the other hand may be postulated to be a state where modulation of cortical processing is optimal.

Common use of brain regions, which tends to correlate variables with each other as seen between EQ and guna personality, may be predicted from traditional guna analysis. Detailed characteristics of guna personality types identify sattvic people as having higher EQ, rajasic people as slightly negative, and tamasic people as low in EQ. Could this be due to insensitivity to mirror neuron functions? This sequence is reflected in pre-pre and post-post correlations between EQ and sattva, rajas and tamas: Positive for the first, a little negative for the second, and far more negative for the third. One way to understand Yoga's strong positive effect on EQ is that it first increases alertness (exemplified by increases in sustained attention); next it erases negative influences on personality (exemplified by decreases in tamas); and finally this leads to increased sensitivity to others' feelings and emotions (exemplified by increases in sattva).

Previous failure to observe the EQ-guna correlations identified here [24] may have been due to a more restricted sample: Industry managers, with a more limited range of personalities. Our observations of independence of sattva and rajas agree with previous results as do negative correlations between sattva and tamas. However, our study found high correlation between rajas and tamas, not seen previously. [24] These correlations may be due to a restricted range of subjects (healthy), manifesting less tamas than a general population. Kumari's result [24] suggests it is probably not due to inherent weakness in the questionnaire. This topic merits further investigation.

When these correlations are compared with each other, many offer self-consistent results; negative correlations between scores on the SLC test and tamas, and between tamas and sattva are consistent with positive correlations observed between SLC scores and sattva.

Remarkably, although the SLC and DLS tests are considered equivalent, they produced inconsistent correlations with the variables EQ, tamas and sattva. It is not clear whether these are chance results or if they effectively distinguish between SLC and DLS tests.

Of particular interest are the correlations between general health and other variables. GHQ is scored according to negative health findings, so high scores indicate susceptibility to disease, particularly psychic illness. Thus, positive r-value correlations with GHQ scores indicate a tendency to fall sick, while negative correlations indicate tendencies to better health. Here negative correlations between GHQ and EQ indicate improved health with improved EQ. Positive correlations with tamas confirm tendencies of high tamas people to disease.

The result that tamas correlate negatively with sattva confirms that the two oppose each other. Post-post correlations between GHQ and tamas increased, while correlations between GHQ and sattva and rajas remained similar. Yoga's improvements in these three variables did not alter their mutual correlations. The failure of tamasic personalities to improve in health increased the negative correlations between GHQ and tamas.

Correlations observed between the gunas themselves do not necessarily indicate poor choice of variables, as normally holds for tests of individual differences in personality. Rather, they tend to confirm that elevated levels of tamas (and to some extent rajas) prevent subjects from manifesting high levels of sattva. The observed negative correlations between sattva and tamas are therefore to be expected.

   Conclusions Top

A single month of integral yoga practices imparts significant benefits to healthy volunteers in all psychological and health variables. It improves sustained attention and EQ. It improves the personality of the healthy person by increasing sattva and decreasing rajas and tamas. It also improves all dimensions of general health.

Cognitive processes involved in sustained attention tests did not correlate with health and personality tests. This may be because the major brain regions involved in cognitive abilities were sufficiently different from those of personality for this group of healthy subjects. Enhancement in the functioning of one would not then seem to affect the other.

On the other hand, the impact of sattvic personality on both emotional intelligence and tamas was established. These significant results would not emerge by measuring single variables alone. It suggests that regular yoga practice benefits people for deeper reasons than immediate effects on the physical body. As Yoga practice transforms people's dominant guna making them more sattvic, their ability to spontaneously maintain high levels of health increases while not being affected by unhelpful emotions.

Thus, it is seen that integral yoga practices impart significant benefits and measuring correlations between different variables can yield significant information of potential importance that would not otherwise be available. Such studies should definitely be continued in future.

   Acknowledgments Top

This work forms part of a dissertation to be submitted by the first author (SSK) to the Swami Vivekananda Yoga Anusamsthana Sansthana in partial fulfillment of his doctoral degree. He is grateful to the University authorities for the opportunity given to him. The authors would like to thank Dr. Ravi Kulkarni of the Division of Physical Sciences at SVYASA for assistance in analysis of statistical data.

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Correspondence Address:
Sushil S Khemka
Swami Vivekananda Yoga Anusandhana Samsthana (SVYASA), Eknath Bhavan, 19, Gavipuram Circle, Kempegowda Nagar, Bangalore - 560 019
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0973-6131.85492

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  [Table 1], [Table 2], [Table 3], [Table 4], [Table 5]

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