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   Table of Contents     
ORIGINAL ARTICLE  
Year : 2022  |  Volume : 15  |  Issue : 2  |  Page : 106-113
Using traditional typologies to understand posture movement and cognitive performance - A cross sectional study


1 National Resource Centre for Value Education in Engineering, Indian Institute of Technology, Delhi, India
2 National Resource Centre for Value Education in Engineering, Indian Institute of Technology; Department of Computer Science and Engineering, Indian Institute of Technology Delhi; Amar Nath and Shashi Khosla School of Information Technology, Indian Institute of Technology Delhi, New Delhi, India
3 Department of Humanities and Social Sciences, Indian Institute of Technology, New Delhi, India

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Date of Submission14-Jan-2022
Date of Decision26-Apr-2022
Date of Acceptance10-Jun-2022
Date of Web Publication5-Sep-2022
 

   Abstract 


Context: We employed two classification methods that characterize psycho-somatotype categorization to understand motor and cognitive performance. The Trunk Index produces three somatotypes/body type categories: ectomorphs, mesomorphs, and endomorphs, and Prakriti classifications categorizes people into three categories: Vata, Pitta, and Kapha. Comparing these two categorization methods offers insights into anthropometric measures that combine psychological and physical characteristics to account for motor and cognitive behavior. Aims: The present study examined variations in cognitive and motor performances using the two typologies – prakriti and somato body types using cross-sectional study design. Subjects and Methods: The study employed fifty-eight healthy young adults, classified into prakriti (vata, pitta, kapha) and ecto-, meso-, endo- morph body types, to examine their cognitive performance (reaction time [RT] and accuracy), and motor performance (posture stability and posture accuracy) in standing yoga postures. Statistical Analysis Used: Analysis of covariance was performed to compare the cognitive and postural performance across the three somato and prakriti types after adjusting for age and gender as covariates. Post-hoc analysis of Bonferroni was performed with the consideration of Levene's test. Partial correlations were employed to investigate the correlation between postural stability and cognitive performance measures for each of the prakriti- and somato-body types as well as between the prakriti typology (scores) and trunk index values (adjusting the effects of age and gender as control variables). A P < 0.05 was selected at the statistical significance level. SPSS 26.0 version was used for the analysis. Results: Cognitive performance was observed to vary in terms of RT across somato- and prakriti body types (P < 0.05). Postural stability and cognitive performance are positively connected only for ectomorph body types (P < 0.05). Variations in motor performance were not significant. Barring ectomorph type, no other somato- and prakriti body types showed significant relationships between postural stability and cognitive performance. Likewise, the association between the features used for prakriti classification, and the trunk index scores showed marginal significance, only for a small subset of physical features of prakriti assessment (P = 0.055) (P1). Conclusions: Comparing classifications that use psychophysical attributes might offer insights into understanding variations in measures of motor and cognitive performance in a sample of healthy individuals.

Keywords: Prakriti, somatotypes, postural (motor) performance, cognition

How to cite this article:
Gupta A, Garg R, Singh V. Using traditional typologies to understand posture movement and cognitive performance - A cross sectional study. Int J Yoga 2022;15:106-13

How to cite this URL:
Gupta A, Garg R, Singh V. Using traditional typologies to understand posture movement and cognitive performance - A cross sectional study. Int J Yoga [serial online] 2022 [cited 2022 Sep 26];15:106-13. Available from: https://www.ijoy.org.in/text.asp?2022/15/2/106/355597



   Introduction Top


With an exponential increase in mindfulness-based practices, there is an increased focus on understanding the challenges in research pertaining to yoga, meditation, and mindfulness studies.[1] One challenge is that heterogeneous practices emerge from various schools of thought (e.g., yoga practice, breathing-based practice, meditation), and variability in the effects these practices have on mental and physical performance.[2] We contemplate that two traditional classification systems based on individual differences in mental and physical constitution might account for variation in engagement and outcome of mindfulness practices that rely on mental and physical resources. For instance, in Indian tradition, Caraka Samhita considers the human body composed of five basic elements – earth, water, fire, air, and ether, of which the whole universe is made up of.[3] Based on this principle, three doshas – Vata, Pitta, and Kapha, which are the unique combinations of the five elements, are present in all human beings.[3] The Theory of Tridosha proposed that the tri-doshas is associated with three types of body and psyche.[3] They are believed to determine a unique combination of physical, physiological, and psychological traits of an individual. Of the three prakriti body types, Vata types are characterized by thin body frame, medium body frames characterize pitta types, and Kapha are characterized by broad body frames.[4] Thus, prakriti classification encompasses a more holistic outlook via the inclusion of variable factors beyond physical matter or body type.

Similarly, Sheldon[5] encapsulated the theory of somatotypes, wherein body types are classified into Ecto-, Meso-, and Endomorphs. He proposed that the human body is categorized into three body types based on germ layers of embryonic development – the ectoderm (forming the skin and nervous system), the mesoderm (forming the muscles, heart, and blood vessels), and the endoderm (resulting in digestive tract). While the abdominal trunk area tends to be dominant over thoracic trunk area among Endomorphs, the thoracic trunk area tends to be dominant over the abdominal trunk area among Mesomorphs, and among Ectomorphs are present long, thin limbs and muscles, low-fat storage.[6] Therefore, Sheldon's classification draws on the physical body structure, namely the ratio of the upper and lower body.

Some studies suggest that cognitive and motor performance covaries[2] and varies according to one's somatotype.[7],[8],[9],[10],[11],[12] Comparatively, in prakriti body types, only one study examined cognitive parameters.[13] To the best of our knowledge, the comparison of cognitive and motor performances using the two classifications of Somatotypes and prakriti body types together remains unexplored.

Ayurveda Prakriti types and Sheldon's Somatotypes uses similar anthropometric features to classify individuals. It remains unknown whether the two classifications can account for individual variations resulting largely from physical body types (somatotype) and body and mind/mental activities such as nature, personality, temperament, and diet. The classification systems rely on anthropometric features such as body size, body weight, shape of the face, cheeks, and chin are used to characterize prakriti of an individual,[14] body frame characteristics such as muscular, plump, lean and delicate, body shapes are used to characterize Sheldon's Somatotypes.[5] With this background in mind, the purpose of this research was (a) to explore potential variation in cognitive and motor behavior of individuals with Somatic- and Prakriti-body types as well as (b) to understand the possible association between two classification systems that rely on anthropometric measures.


   Subjects and Methods Top


Participants

This was a cross-sectional study wherein healthy participants (24 females and 34 males) in the age group of 17–32 years were classified into Prakriti and Somatotypes. Fifty-eight participants from a secondary data set have been used in this study. The dataset comprised participants who were recruited from the authors institution using convenience sampling.

Measures

Four cognitive tasks from the psychological experiment builder language were used to evaluate spatial and phonological working memory, decision-making, and inhibition.[15] Moreover, postural assessments were made using the scales developed by Singh and Mutreja.[15]

Corsi block test (forward)

This task evaluated the reaction time (RT) in milliseconds and visuospatial working memory span, wherein participants were asked to recall the sequence of blocks presented in increasing order.[16]

Digit span test (forward)

This task evaluated the RT in milliseconds and the memory span of the phonological working memory, wherein participants were presented digits in an increasing order and asked to recall the sequence of digits in the order presented.[17]

Iowa gambling task

This test assessed the decision-making as described by Bechara et al.[18] In the test, the participants were presented with four Decks, A, B, C, and D, each of which have a different probability of win versus loses. Among them, two decks were disadvantageous (A and B) and two were advantageous (C and D), depending on whether the selections lead to losses or gains over the others in the long run. Participants were shown a virtual amount of 2000$ on the computer screen and asked to gain money as much as possible and avoid losses. They had to select one card from each deck consecutively and were unaware whether the deck was advantageous (small gains with smaller losses) or disadvantageous (big gains with expensive losses). After each choice, the money gained or lost was updated on the screen.

Simon task

In this task, a colored circle (right and blue) appeared on the computer screen, and the participant must identify the color of the circle presented on the screen by pressing a keyboard button (blue = right shift and red = left shift). While during congruent trials, the red-colored circle appears on the left side of the screen and the blue circle appears on the right side of screen, exactly the opposite happens during incongruent trials. The task assesses the ability to inhibit a target location-based response.[19]

Postural performance assessments (posture stability and accuracy)

Singh and Mutreja[15] developed behavioral scales to assess motor performance during yoga postures. Posture accuracy (termed “posture rating”) was assessed with ratings ranging from 0 to 4 where 0 indicates the great difficulty to perform a yoga posture, 1 indicates difficulty, 2 indicates moderate difficulty/ease, 3 indicates ease, and 4 indicates great ease, and posture stability (termed as “posture error frequency”) were assessed with the number of unplanned movements (fall/tripping/loss of balance/deviation from planned posture movement) during the posture holding duration.

Anthropometric measurements

Body weight (in Kg) and height (in meters) were self-reported in the study.

Procedure

All participants were classified into three somato- and prakriti-types using the following procedures:

Somatotype categorization

Sheldon[20] proposed using Trunk Index values to determine the somato body types. He postulated that the Trunk Index is the ratio of the thoracic trunk area to the abdominal trunk area and remains unaffected by an individual nutritional status and bodily changes.[20] To calculate the two areas, the photographs of the study participants were taken, and with the help of graph paper, the thoracic and abdominal trunks were transcribed onto it. The number of complete squares, exactly half squares, more than half squares, and those of less than squares that fell into the two areas were counted. On the graph paper, the dimensions of one square were measured as 0.5 cm length and 0.5 cm as breadth. Areas of complete squares and more than half squares were counted as those of one square, those of exactly half squares were counted as half square, and areas of less than half squares were excluded in calculating the thoracic and abdominal trunk areas. The trunk Index is then calculated as the ratio of thoracic (numerator) and abdominal areas (denominator). The participants with the lowest Trunk Index values were considered ectomorphs, those with mid-range values were considered mesomorphs, and those with higher values were considered endomorphs.[20]

Prakriti body type categorization

Sharira Sthana of Ashtanga Hiradya[21] and Sushruta Samhita[22] described prakriti based on the physical, physiological, and psychological features of Vata, Pitta, and Kapha doshas. Moreover, there are three ways to determine an individual's prakriti-(a) sparshana (touch based), (b) prashnam (questions based), (c) darshanam (visual based). Gayatri Gadre[23] used the visual-based approach to determine one's prakriti. The author used the nine visual features – body size, body weight, cheeks, face shape/chin, eyes, nose, lips, skin, and hairs – to classify the individuals into prakriti types. Adopting a similar approach, the prakriti assessment has been done manually based on the recorded videos; and only the visible, physical features were taken into consideration in the assessment. However, since we are comparing the two-body type classifications, we used only the anthropometric features in prakriti assessment to find an association between Prakrti and Sheldon's Somatotypes. Each feature had three options based on characteristics attributed to Vata, Pitta, and Kapha, respectively. Each respondent's visual feature was observed and assigned to either of the three options according to his or her body type. Based on the maximum attributes, prakriti body type was determined.

Afterward, cognitive, and postural measures were compared across the three categories of the two body typologies after adjusting for age and gender as covariates.

Yoga posture performance

For postural performance assessments, six standing yoga postures, performed by each participant, were selected from a secondary data of 20 postures. Among these six, four were bilateral postures and two were unilateral postures. Each posture was performed for 2 min in total, where bilateral postures were performed for 1 min on each side and unilateral postures were performed for 2 min. Details are given in [Table 1].
Table 1: Standing yoga postures analysed in this study

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Variables and data analysis

Cognitive and postural performance measures were considered continuous variables. Normality tests were performed to each of the cognitive and postural measures, and they were found to violate the assumption of normal distribution. Hence, all data sets have been transformed into normally distributed z-scores using a novel statistical technique known as the two-way approach for transforming continuous variables to normal.[24] Afterward, normality tests (Shapiro–Wilk and Kolmogorov–Smirnov tests) were again performed on each dataset and found that the datasets fulfill the assumption of normal distribution. Afterward, analysis of covariance (ANCOVA) was performed to compare the cognitive and postural performance across the three somato and prakriti types after adjusting for age and gender as covariates.

Post hoc analysis of Bonferroni was performed with the consideration of Levene's test. Data are presented as mean and standard deviation, and the results of the ANCOVA test are presented as estimated means and standard deviation. A P < 0.05 was selected at the significance level. Similarly, parametric partial correlations were employed to determine the associations between error frequency (postural stability) and cognitive performance measures for each of the Prakriti and Sheldon's Somatotypes. For the association between prakriti scores and trunk index values, nonparametric partial correlations[25] were employed since the prakriti, and trunk index values were found to violate assumptions of normality even after applying the said transformation.[24] SPSS (IBM SPSS Statistics for Windows, Version 26.0. Armonk, NY: IBM Corp) was used for the analysis.[26]


   Results Top


The results are divided into five sections. The first section describes the general characteristics of the study participants across somato- and prakriti-types. The second section describes the differences in cognitive and postural performance measures across the three somatotypes with age and gender covariates. The third section describes the differences in cognitive and postural performance measures across the three prakriti types with age and gender as covariates. Forth section describes the correlations between postural and cognitive performance measures across the three prakriti and somatotypes. Moreover, section five describes the correlations between prakriti and trunk value indexes.

Section 1: General characteristics of participants

The mean age, height, and weight are given in [Table 2]. The mean age of all participants was 22.37 ± 3.94 years. No significant differences appeared in the mean age across the three somatotypes, F (2, 55) = 1.240, P = 0.297. Similarly, no significant differences were found in the mean age across the three prakriti groups, F (2, 55) = 0.841, P = 0.437.
Table 2: General characteristics of the participants

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Regarding height, weight, and body mass index, no significant differences appeared among them belonging to three somatotypes and prakriti body types.

Section 2: Differences in cognitive and postural performance measures across the three somatotypes with age and gender as covariates

ANCOVA analyses were performed on the cognitive and postural performance measures after adjusting for age and gender as covariates. The results are presented in [Table 3]. Only corsi RT scores showed significant differences across the three somatotypes, wherein Ectomorphs showed greater RTs than mesomorphs. No significant differences appeared in the remaining cognitive and postural measures.
Table 3: Estimated mean (standard deviation) of each somatotype when age and gender are used as covariates

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Section 3: Differences in cognitive and postural performance measures across the three prakriti-types with age and gender as covariates

The results of ANCOVA analysis for cognitive and postural performance measures are presented in [Table 4]. Significant differences appeared only in Simon RTs, wherein Kapha types were found to have greater RTs than Pitta types. No other significant differences appeared in cognitive and postural performance measures across the three prakriti types.
Table 4: Estimated mean (standard deviation) of each prakriti type when age and gender are used as covariates

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Section 4. Partial correlations between error frequency scores (postural stability) and cognitive performance measures across Prakriti- and somato-types adjusting the effect of age and gender as control variables

The results of partial correlations between error frequency scores (postural stability) and cognitive performance measures across Prakriti- and somato-types are presented in [Table 5]. Significant correlations appeared among ectomorphs only, wherein corsi span scores are found to correlate positively after adjusting the age and gender as control variables. No other significant correlations appeared between error frequency scores (postural stability) and cognitive performance measures in the remaining prakriti and somatotypes.
Table 5: Partial correlation between error frequency scores (postural stability) and cognitive performance measures across Prakriti-and somato-types when age and gender are used as control variables

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Section 5. Nonparametric partial correlations between prakriti and trunk value indexes adjusting the effect of age and gender as control variables.

The nonparametric partial correlations between prakriti and trunk index values after adjusting the effect of age and gender as control variables are presented in [Table 6]. No significant correlations appeared between the two indexes.
Table 6: Nonparametric partial correlations between prakriti scores and Trunk Index values adjusting the effect of age and gender as control variables

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   Discussion Top


We used two classifications to understand variability in yoga posture performance and cognitive performance. Although somatotype classification is associated with sets of psychological traits, validated in studies.[27] The results align with other studies where somatotype was associated with motor[28],[29],[30] and cognitive differences[10] among the three somatotypes. However, we observed that the holistic typology of prakriti might also be associated with cognitive performance. While studies[31],[32] have shown a relationship between somatic and prakriti body types, there is a scarcity of research on cognitive and motor function utilizing the two most generally used typologies, which represent diametrically opposed schools of thought.

Pitta body types performed better than Kapha body types in this research; particularly, response time was longer for Kapha body types than for Pitta or Vata body types. Rapolu et al.[33] discovered that Kapha body types exhibit physiological modulation that is distinct from Vata and Pitta body types, as well as others who have shown body-type distinctions at the brain level,[34] implying that typology derived from prakriti may account for individual variances in response time. Similarly, Sheldon[5] classified ectomorphs as socially nervous persons, mesomorphs as assertive, and endomorphs as slow, methodical thinkers among the three somatotypes. In addition, social anxiety has been shown to improve visuospatial working memory ability.[35] This may account for the present study's conclusion concerning the visuo-spatial working memory performance of the three somatotypes, which indicates that ectomorphs perform worse on the corsi block test than mesomorphs.

The seven physical features identified by Gadre[23] were used to determine the prakriti of study participants. This was the fundamental weakness of the research. Konjengbam et al.,[31] used a set of 41 features to delineate the prakriti types of healthy individuals. Rotti et al.,[36] used visual, tactile, vocal features, movement, and gait characteristics, and dietary and lifestyle-related parameters in the identification of prakriti types. Bhalerao, Deshpande, and Thatte[3] used 37 features to classify thirty healthy participants into prakriti body types. Godke et al.[37] used physical, physiological, and psychological traits to evaluate prakriti. Govindaraj et al.,[38] carried out the prakriti assessment in three stages. In the first stage, assessments were carried out by the Ayurveda physician using classical Ayurveda parameters. In the second stage, Ayusoft was used. Moreover, in the third stage, another set of Ayurveda physicians who were blind to the first two assessments analyzed and compared prakriti of the study participants. Similarly, others[39],[40],[41],[42],[43],[44] have used anatomical, physiological, as well as psychological characteristics in determining the prakriti. Therefore, employing only the physical attributes in determining the prakriti of the study participants is one possible explanation for the lack of significance in the motor results for the three prakriti groups. In addition, the participants were classified into different body types according to their physical attributes, and improvements were observed in cognitive parameters during the study. This is fascinating since establishing one's Prakriti type after considering psychological characteristics would likely clarify or improve cognitive performance. It is imperative that future studies consider this aspect. Similarly, the present study used the Trunk Index method as the basis for classifying the body types into three somatotypes,[20] others have used the Heath Carter method of somatotyping assessing motor and cognitive differences among individuals.[9],[11],[45],[46] Alternate methods such as Parnell's method,[46] and equation-based somatotyping methods as described in Heath Carter's method should be included with other methods such as photographic assessment of characterizing somatotypes. Like others, we acknowledge that a limited sample size might be an important determining factor.[47] Including experienced practitioners would offer insights into our understanding of body classification systems and cognitive performance.[48],[49] Our preliminary findings using a small sample size, and our brief assessment from two typology systems suggest that a thorough comparison of prakriti and somatotype classification systems applied to the understanding of motor control (e.g., postures and movements) and cognitive control (e.g., working memory, inhibition, and flexibility) might provide a holistic understanding of mind, body, and cognition.


   Conclusions Top


A comprehensive categorization system that encompasses mental and physical activities, as well as somatotypes that are solely centered on a body type, may help explain some aspects of cognitive function.

Financial Support and Sponsorship:

The study was funded by the Faculty Interdisciplinary Research Project (FIRP), IIT Delhi provided to the two authors (VS and RG).

Ethical clearance

The study was approved by Institute Ethics Committee of IIT Delhi in 2017 [IEC No P003].

Conflicts of interest

There are no conflicts of interest.



 
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Correspondence Address:
Ankit Gupta
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijoy.ijoy_12_22

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  [Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6]



 

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