from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.lib import colors
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, HRFlowable
from reportlab.lib.enums import TA_LEFT, TA_CENTER, TA_JUSTIFY

output_path = "/tmp/workspace/rucha-thesis/Discussion_Rucha_Gupte_Thesis.pdf"

doc = SimpleDocTemplate(
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    leftMargin=2.5*cm,
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)

styles = getSampleStyleSheet()

# Custom styles
title_style = ParagraphStyle(
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subtitle_style = ParagraphStyle(
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h1_style = ParagraphStyle(
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h2_style = ParagraphStyle(
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    fontName='Helvetica-Bold',
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body_style = ParagraphStyle(
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bold_inline = ParagraphStyle(
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)

ref_style = ParagraphStyle(
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story = []

# ── TITLE ──────────────────────────────────────────────────────────────────────
story.append(Paragraph("DISCUSSION", title_style))
story.append(Paragraph(
    "Effect of Four Weeks of Bilateral Limb Training on Reaction Time and Balance<br/>"
    "in Children with Down Syndrome: A Quasi-Experimental Study",
    subtitle_style
))
story.append(HRFlowable(width="100%", thickness=1.2, color=colors.HexColor('#0f3460')))
story.append(Spacer(1, 12))

# ── 4.1 ────────────────────────────────────────────────────────────────────────
story.append(Paragraph("4.1  Overview of Study Design and Sample Characteristics", h1_style))
story.append(Paragraph(
    "The present study was a quasi-experimental single-group pre-post design involving 30 children "
    "with Down syndrome (DS) aged 9 to 16 years (mean 13.20 ± 2.14 years). The sample comprised "
    "18 males (60%) and 12 females (40%), consistent with the male predominance commonly reported "
    "in DS-related motor rehabilitation research. A four-week bilateral limb training programme was "
    "administered, and its effects were evaluated on two primary outcome measures: reaction time (RT) "
    "and dynamic balance assessed through the Modified Timed Up and Go (mTUG) test.",
    body_style
))
story.append(Paragraph(
    "The study findings demonstrate a highly statistically significant improvement in both outcomes "
    "following intervention. Reaction time decreased from 2.00 ± 0.35 seconds at baseline to "
    "1.02 ± 0.42 seconds post-intervention (Wilcoxon Signed Rank Test, Z = −5.316, p &lt; 0.001; "
    "Cohen's dz = −4.67). The mTUG score decreased from 9.93 ± 1.26 seconds at baseline to "
    "8.09 ± 1.15 seconds post-intervention (paired t-test, t = 10.064, df = 29, p &lt; 0.001; "
    "Cohen's dz = −3.47). Both effect sizes were extremely large, indicating a clinically and "
    "statistically meaningful response to the intervention.",
    body_style
))

# ── 4.2 ────────────────────────────────────────────────────────────────────────
story.append(Paragraph("4.2  Neuromotor Background of Down Syndrome", h1_style))
story.append(Paragraph(
    "Down syndrome, caused by trisomy of chromosome 21, is characterised by widespread neurological, "
    "musculoskeletal, and cognitive impairments that collectively impair both speed of motor response "
    "and postural stability. These impairments form the essential physiological rationale for targeting "
    "RT and balance in the present study.",
    body_style
))

story.append(Paragraph("<b>Cerebellar dysfunction</b>", h2_style))
story.append(Paragraph(
    "Cerebellar dysfunction is a well-established structural finding in DS. A 2025 review documented "
    "that DS mouse models and human fetal studies consistently demonstrate severe neurogenesis impairment "
    "in the cerebellum, particularly involving granule cells, Purkinje cells, and disruption of GABAergic "
    "transmission (1). This cerebellar hypotrophy directly undermines motor coordination, postural control, "
    "and timing — the core components measured by RT and TUG tests.",
    body_style
))

story.append(Paragraph("<b>Interhemispheric transmission deficits</b>", h2_style))
story.append(Paragraph(
    "Interhemispheric transmission deficits further explain the prolonged reaction times observed in DS. "
    "Heath et al. used the Poffenberger paradigm to demonstrate that individuals with DS exhibited slower "
    "and more variable reaction times than age-matched controls, attributing this to anomalous cerebral "
    "lateralisation and impaired interhemispheric communication through morphological abnormalities of the "
    "corpus callosum (2). This neurological backdrop explains the elevated baseline RT of 2.00 ± 0.35 seconds "
    "observed in the current study's cohort.",
    body_style
))

story.append(Paragraph("<b>Muscle hypotonia</b>", h2_style))
story.append(Paragraph(
    "Muscle hypotonia is a universal finding in DS and is a primary contributor to both delayed motor "
    "responses and poor dynamic balance. Generalised low muscle tone reduces proprioceptive feedback, "
    "impairs joint stabilisation, and slows the recruitment of fast-twitch motor units needed for rapid, "
    "coordinated limb movements (3).",
    body_style
))

story.append(Paragraph("<b>Cognitive control of movement</b>", h2_style))
story.append(Paragraph(
    "Cognitive control of movement is also impaired in DS. Brunamonti et al. demonstrated that individuals "
    "with DS showed deficits in movement preparation and cognitive control of voluntary actions, independently "
    "of peripheral motor output, reflecting frontal lobe and basal ganglia involvement (4). This compound "
    "cognitive-motor deficit underpins the observed slow reaction times prior to training.",
    body_style
))

# ── 4.3 ────────────────────────────────────────────────────────────────────────
story.append(Paragraph("4.3  Reaction Time: Findings and Literature Support", h1_style))
story.append(Paragraph(
    "The present study found that four weeks of bilateral limb training produced a mean reduction in RT "
    "of 0.98 ± 0.21 seconds (p &lt; 0.001; Cohen's dz = −4.67), representing a nearly 49% improvement "
    "from baseline. Given the non-normal post-intervention distribution (Shapiro-Wilk p = 0.011), the "
    "Wilcoxon Signed Rank Test was appropriately chosen, yielding a Z-score of −5.316, confirming the "
    "extreme statistical significance of this change.",
    body_style
))
story.append(Paragraph(
    "This finding is consistent with evidence that structured motor training can improve reaction time "
    "in individuals with DS. Ringenbach et al. conducted a randomised controlled trial of 8 weeks of "
    "assisted cycling therapy in adolescents with DS (mean age ~18 years) and demonstrated significantly "
    "improved reaction times (Hedges' g = −0.42), alongside improved inhibitory control (5). The authors "
    "attributed improvement to increased neuroplasticity and enhanced prefrontal cortex function following "
    "rhythmic bilateral motor stimulation. Although the current study's effect size was substantially larger "
    "(Cohen's dz = −4.67), this may be partially explained by the younger age group (9–16 years vs. ~18 years) "
    "and the greater neuroplastic potential of the developing brain, as well as the higher baseline severity "
    "of impairment in the present sample.",
    body_style
))
story.append(Paragraph(
    "Rao et al. assessed response abilities of children with DS and other intellectual developmental "
    "disorders across simple, dual, and choice reaction tasks. Their findings confirmed that reaction times "
    "in children with DS were significantly longer than in typically developing children and increased "
    "disproportionately as task complexity rose, highlighting the neurological basis of RT deficits and "
    "the value of training these children on structured bilateral coordination tasks (6).",
    body_style
))

story.append(Paragraph("Mechanistic pathways of RT improvement:", h2_style))
story.append(Paragraph(
    "<b>1. Interhemispheric facilitation:</b> Bilateral simultaneous limb movements recruit both cerebral "
    "hemispheres concurrently and are thought to enhance callosal connectivity and reduce the "
    "interhemispheric transmission deficit documented in DS (2). This may explain why improvement "
    "in the present study was more pronounced than that achieved by unilateral or non-specific "
    "aerobic interventions.",
    body_style
))
story.append(Paragraph(
    "<b>2. Cortical and cerebellar motor learning:</b> Repetitive bilateral motor tasks during four weeks "
    "of training likely promoted synaptic strengthening in cerebellar and supplementary motor circuits. "
    "Greenough et al. showed that bilateral reaching training produced significantly greater dendritic "
    "branching in motor-sensory cortical neurons compared to unilateral training, providing a "
    "neuroanatomical basis for the superiority of bilateral training in motor cortical reorganisation (7).",
    body_style
))
story.append(Paragraph(
    "<b>3. Reduction of central processing delays:</b> Repeated practice of bilaterally timed motor "
    "responses likely shortened central processing time (premotor RT) and improved stimulus-response "
    "coupling, manifesting as the dramatic reduction in overall RT seen in this cohort.",
    body_style
))

# ── 4.4 ────────────────────────────────────────────────────────────────────────
story.append(Paragraph("4.4  Balance and Functional Mobility: Findings and Literature Support", h1_style))
story.append(Paragraph(
    "The mTUG score improved from 9.93 ± 1.26 seconds pre-intervention to 8.09 ± 1.15 seconds "
    "post-intervention, a mean reduction of 1.84 ± 0.53 seconds (paired t-test, t = 10.064, "
    "p &lt; 0.001; Cohen's dz = −3.47). All data were normally distributed (Shapiro-Wilk p &gt; 0.05 "
    "for pre, post, and difference scores), justifying the use of the parametric test. The extremely "
    "large effect size confirms a clinically meaningful improvement in functional mobility and dynamic balance.",
    body_style
))
story.append(Paragraph(
    "The TUG and its modified versions are well-validated outcome measures for individuals with DS. "
    "Christopher et al. conducted a systematic review confirming the reliability and validity of the "
    "TUG as a clinical tool across individuals with and without disabilities across the lifespan, "
    "including those with intellectual disabilities (8). Villamonte et al. specifically assessed the "
    "reliability of 16 balance tests in individuals with DS and found the TUG to be a reliable and "
    "appropriate measure for this population (9).",
    body_style
))
story.append(Paragraph(
    "Gupta et al. conducted a six-week randomised controlled trial of progressive resistive exercise "
    "and balance training in 23 children with DS. The intervention group showed significant improvements "
    "in lower limb muscle strength and balance scores on the Bruininks-Oseretsky Test of Motor Proficiency "
    "compared to controls (p &lt; 0.05), confirming that structured neuromuscular training directly targets "
    "the musculoskeletal deficits underlying poor balance in DS (10).",
    body_style
))
story.append(Paragraph(
    "Alsakhawi and Elshafey demonstrated in a three-group randomised controlled trial that core stability "
    "exercises and treadmill training both significantly improved functional balance and stability indices "
    "in children with DS over 8 weeks, with combined programmes producing superior results (11). These "
    "results align with the current study's finding that four weeks of bilateral training was sufficient "
    "to produce significant mTUG improvement, suggesting that intensive, task-specific training compressed "
    "into a shorter period can yield equivalent or greater gains when performed bilaterally.",
    body_style
))
story.append(Paragraph(
    "Azab et al. investigated 12 weeks of trampoline-based stretch-shortening cycle exercises in 32 "
    "children with DS (aged 7–9 years) and found significant improvements in lower limb muscle strength "
    "and postural stability indices, reinforcing the concept that multi-limb, rhythmic, weight-bearing "
    "exercises that challenge the postural system bilaterally are particularly effective for improving "
    "dynamic balance in this population (12).",
    body_style
))
story.append(Paragraph(
    "Al-Nemr and Reffat showed that adding Pilates exercises to standard physiotherapy significantly "
    "improved dynamic balance, gross motor coordination, and quality of life in 40 children with DS "
    "aged 8–10 years, compared to physiotherapy alone (p &lt; 0.0001) (13). The core stabilisation and "
    "bilateral lower limb engagement inherent to Pilates parallels the bilateral limb loading component "
    "of the present study's intervention, providing mechanistic corroboration.",
    body_style
))
story.append(Paragraph(
    "Kaya et al. demonstrated that hippotherapy added to standard physiotherapy significantly improved "
    "both Pediatric Balance Scale and TUG scores in 34 children with DS, with functional independence "
    "also improving in the hippotherapy group (14). The TUG improvements reported therein are "
    "directionally consistent with the mTUG reduction of 1.84 seconds found in the present study.",
    body_style
))
story.append(Paragraph(
    "Rodriguez-Grande et al. conducted a systematic review of neuromuscular exercise in children with "
    "DS (aged 6–18 years), finding that neuromuscular interventions - including mechanotherapy, vibration, "
    "and core stability training at 60–80% of maximal voluntary contraction - significantly improved lower "
    "limb muscle strength (mean 8.51 kg increase, 95% CI 2.35–14.67) and balance (−0.20 stability index, "
    "95% CI −0.29 to −0.12). Effectiveness was primarily seen in children aged over 8 years (15). The "
    "present study's cohort (mean age 13.20 years) falls squarely within this responsive age range.",
    body_style
))

# ── 4.5 ────────────────────────────────────────────────────────────────────────
story.append(Paragraph("4.5  Why Bilateral Limb Training is Mechanistically Apt for DS", h1_style))
story.append(Paragraph(
    "Bilateral limb training involves simultaneous or alternating use of both upper and/or lower limbs "
    "in a coordinated, task-structured manner. The rationale for its application in DS is multi-layered:",
    body_style
))
story.append(Paragraph(
    "<b>1. Corpus callosum engagement:</b> DS is associated with morphological abnormalities of the corpus "
    "callosum, reducing efficient interhemispheric signal transfer — a primary substrate for both delayed "
    "RT and impaired bilateral motor coordination (2). Bilateral training specifically engages both "
    "hemispheres simultaneously and may serve as a targeted stimulus to the cortico-callosal pathway.",
    body_style
))
story.append(Paragraph(
    "<b>2. Cerebellar activation:</b> The cerebellum, which is disproportionately hypotrophic in DS due "
    "to reduced granule cell neurogenesis (1), plays a central role in timing, balance, and anticipatory "
    "postural adjustments. Bilateral limb exercises — especially rhythmic, weight-bearing, symmetrical "
    "movements — are strong cerebellar activators and can promote cerebellar synaptic plasticity even "
    "in the presence of structural hypotrophy.",
    body_style
))
story.append(Paragraph(
    "<b>3. Motor learning through repetition:</b> Rodriguez-Grande et al. confirm that children with DS "
    "over age 8 are capable of meaningful neuromuscular adaptation with structured exercise programmes (15). "
    "Four weeks at high training frequency appears sufficient to produce measurable and clinically large "
    "neuromotor gains in adolescents, as demonstrated in this study.",
    body_style
))
story.append(Paragraph(
    "<b>4. Postural stabilisation:</b> Bilateral lower limb training places symmetrical loading demands "
    "on the postural control system, activating hip, knee, and ankle stabilisers that are characteristically "
    "hypotonic in DS (10, 12). The resulting co-contraction and joint stabilisation improves the "
    "biomechanical foundation of both static and dynamic balance.",
    body_style
))

# ── 4.6 ────────────────────────────────────────────────────────────────────────
story.append(Paragraph("4.6  Effect Size Interpretation", h1_style))
story.append(Paragraph(
    "The Cohen's dz values obtained in this study (−4.67 for RT; −3.47 for mTUG) are remarkably large "
    "by conventional benchmarks (small: 0.2, medium: 0.5, large: 0.8). While extremely large within-group "
    "effect sizes in pre-post designs can partially reflect regression to the mean, ceiling/floor effects, "
    "or the absence of a control group, the magnitude here is consistent with the documented responsiveness "
    "of motor outcomes to structured exercise in neurologically impaired children with high baseline deficits. "
    "Gupta et al. (10) similarly reported large between-group effect sizes for balance, and Al-Nemr and "
    "Reffat (13) found p &lt; 0.0001 across all outcomes. The current effect sizes should nonetheless be "
    "interpreted with appropriate caution given the single-group quasi-experimental design, and a future "
    "randomised controlled trial with an active or waitlist control group is recommended to establish "
    "causal attribution.",
    body_style
))

# ── 4.7 ────────────────────────────────────────────────────────────────────────
story.append(Paragraph("4.7  Limitations and Future Directions", h1_style))
story.append(Paragraph(
    "<b>1. Absence of control group:</b> The quasi-experimental design does not permit ruling out "
    "maturation, practice effects, or regression to the mean as contributors to the observed "
    "improvements. A randomised controlled trial with a matched control group is warranted.",
    body_style
))
story.append(Paragraph(
    "<b>2. Short intervention duration:</b> The four-week programme does not allow assessment of "
    "retention, long-term consolidation, or dose-response relationships. Future studies should "
    "include follow-up assessments at 4 and 12 weeks post-intervention.",
    body_style
))
story.append(Paragraph(
    "<b>3. Heterogeneity of DS severity:</b> The study did not stratify participants by degree of "
    "cognitive impairment or DS phenotypic severity, both of which can influence motor learning "
    "capacity and responsiveness to training.",
    body_style
))
story.append(Paragraph(
    "<b>4. Outcome measures:</b> While the mTUG is a validated functional mobility tool, additional "
    "measures such as the Pediatric Balance Scale, force-plate-based stability indices, or "
    "electrophysiological measures of reaction time (P300 latency) would provide a more complete "
    "neuromotor profile.",
    body_style
))
story.append(Paragraph(
    "<b>5. Age range:</b> The broad age range (9–16 years) and non-normal age distribution "
    "(Shapiro-Wilk p = 0.038) introduce developmental heterogeneity. Future studies should "
    "stratify by developmental stage to isolate the neural and musculoskeletal mechanisms "
    "operating in specific age windows.",
    body_style
))

# ── 4.8 ────────────────────────────────────────────────────────────────────────
story.append(Paragraph("4.8  Clinical Implications", h1_style))
story.append(Paragraph(
    "The results of this study support the integration of bilateral limb training into physiotherapy "
    "programmes for children with DS as a structured, time-efficient, and highly effective approach "
    "to improving reaction time and functional balance. Given the brevity of the intervention "
    "(four weeks) and the magnitude of the outcomes, bilateral training may offer a pragmatic and "
    "feasible alternative to longer or more resource-intensive protocols. Physiotherapists and "
    "rehabilitation specialists working with DS populations should consider bilateral, task-specific "
    "motor training as a targeted adjunct to neurodevelopmental therapy. The improvement in mTUG "
    "scores is particularly relevant to activities of daily living, fall prevention, and school-based "
    "mobility in this population.",
    body_style
))

# ── REFERENCES ─────────────────────────────────────────────────────────────────
story.append(Spacer(1, 8))
story.append(HRFlowable(width="100%", thickness=1, color=colors.HexColor('#0f3460')))
story.append(Paragraph("REFERENCES", ref_heading_style))

references = [
    ("1.", "Feely S, Rios Rodriguez M, Shannon A, Young S, Rosales JP, Kaur G. A Dive Into Cerebellar Dysfunction, Motor Deficits and GABAergic Signaling in Down Syndrome. Cureus. 2025 Feb;17(2):e79623."),
    ("2.", "Heath M, Grierson L, Binsted G, Elliott D. Interhemispheric transmission time in persons with Down syndrome. J Intellect Disabil Res. 2007 Dec;51(12):972-81."),
    ("3.", "Paleg G, Romness M, Livingstone R. Interventions to improve sensory and motor outcomes for young children with central hypotonia: a systematic review. J Pediatr Rehabil Med. 2018;11(1):57-71."),
    ("4.", "Brunamonti E, Pani P, Papazachariadis O, Onorati P, Albertini G, Ferraina S. Cognitive control of movement in Down syndrome. Res Dev Disabil. 2011 Sep-Oct;32(5):1792-7."),
    ("5.", "Ringenbach SDR, Holzapfel SD, Mulvey GM, Jimenez A, Benson A, Richter M. The effects of assisted cycling therapy (ACT) and voluntary cycling on reaction time and measures of executive function in adolescents with Down syndrome. J Intellect Disabil Res. 2016 Nov;60(11):1073-85."),
    ("6.", "Rao PT, Guddattu V, Solomon JM. Response abilities of children with Down Syndrome and other intellectual developmental disorders. Exp Brain Res. 2017 May;235(5):1523-34."),
    ("7.", "Greenough WT, Larson JR, Withers GS. Effects of unilateral and bilateral training in a reaching task on dendritic branching of neurons in the rat motor-sensory forelimb cortex. Behav Neural Biol. 1985 Sep;44(2):301-14."),
    ("8.", "Christopher A, Kraft E, Olenick H, Kiesling R, Doty A. The reliability and validity of the Timed Up and Go as a clinical tool in individuals with and without disabilities across a lifespan: a systematic review. Disabil Rehabil. 2021 Jun;43(13):1799-813."),
    ("9.", "Villamonte R, Vehrs PR, Feland JB, Johnson AW, Seeley MK, Eggett D. Reliability of 16 balance tests in individuals with Down syndrome. Percept Mot Skills. 2010 Oct;111(2):530-42."),
    ("10.", "Gupta S, Rao BK, Kumaran SD. Effect of strength and balance training in children with Down's syndrome: a randomized controlled trial. Clin Rehabil. 2011 May;25(5):425-32."),
    ("11.", "Alsakhawi RS, Elshafey MA. Effect of Core Stability Exercises and Treadmill Training on Balance in Children with Down Syndrome: Randomized Controlled Trial. Adv Ther. 2019 Sep;36(9):2364-73."),
    ("12.", "Azab AR, Mahmoud WS, Basha MA, Hassan SM, Morgan EN, Elsayed AE. Distinct effects of trampoline-based stretch-shortening cycle exercises on muscle strength and postural control in children with Down syndrome: a randomized controlled study. Eur Rev Med Pharmacol Sci. 2022 Mar;26(6):2029-38."),
    ("13.", "Al-Nemr A, Reffat S. Effect of Pilates exercises on balance and gross motor coordination in children with Down syndrome. Acta Neurol Belg. 2024 Oct;124(5):1507-15."),
    ("14.", "Kaya Y, Saka S, Tuncer D. Effect of hippotherapy on balance, functional mobility, and functional independence in children with Down syndrome: randomized controlled trial. Eur J Pediatr. 2023 Jul;182(7):3181-91."),
    ("15.", "Rodriguez-Grande EI, Vargas-Pinilla OC, Torres-Narvaez MR, Rodriguez-Malagon N. Neuromuscular exercise in children with Down Syndrome: a systematic review. Sci Rep. 2022 Sep 2;12(1):14741."),
]

for num, text in references:
    story.append(Paragraph(f"<b>{num}</b>  {text}", ref_style))
    story.append(Spacer(1, 2))

# ── BUILD ──────────────────────────────────────────────────────────────────────
doc.build(story)
print(f"PDF created: {output_path}")