Scientific papers on high-intensity interval training (HIIT) for overweight and obese people have surged exponentially since 2011, peaking in 2022 with fat loss and heart health wins. A new bibliometric review of 282 studies maps booming research showing HIIT beats moderate workouts for slashing body fat, boosting VO2max, and cutting cardiometabolic risks—no sex differences. Time-efficient bursts (e.g., 21 minutes/week) rival hours of steady cardio, offering hope amid 2 billion excess weight cases globally.
HIIT Boom: From Niche to Fat-Fighting Powerhouse
Overweight/obesity hits 30% worldwide, fueling heart disease—the top killer. HIIT—short, savage sprints (90% VO2max) alternating rests—sparks aerobic gains, fat burn, insulin sensitivity faster than moderate continuous training (MICT). Review scans Web of Science/PubMed (2011-2024), using VOSviewer for trends: 81% articles, 15% reviews.
Production: Linear 2011-2017, explosive 2018-2019, peak 2022 (46 papers), dip 2023-2024. Citations peaked 2014/2019 (1008/1169). Keywords: exercise (145), obesity (131), HIIT (81), overweight (78), physical activity (73). Top journals: Medicine & Science in Sports & Exercise (640 cites).
Fat Melts, Hearts Strengthen: HIIT’s Proven Edge
HIIT shrinks total fat (esp. running > cycling), abdominal/visceral depots (low-intensity best). Meta-analyses: 1.7-2.6kg fat drop, 3cm waist trim vs MICT; visceral fat -19.5% (treadmill). VO2max jumps 3-7.9% more than MICT—key for longevity. Blood pressure dips (systolic -3.67mmHg), LDL/triglycerides fall, HDL/insulin sensitivity rise.
No sex gaps; works kids-adults. Short protocols (4 weeks, 30s intervals, 5min total) rival long slogs—40% less time. Combos with calorie cuts amplify.
Table 1: Top HIIT Benefits from Key Reviews (Cites)
| Review (Year, Cites) | Fat Loss | VO2max Gain | Other Wins |
|---|---|---|---|
| Weston (2014, 824) | LDL↓, TG↓ | ↑ vs MICT | BP↓, insulin↑, mito↑ |
| Jelleyman (2015, 364) | HOMA↓ | ↑ | Glucose↓ (T2D best) |
| Wewege (2017, 332) | 1.7-2.6kg | – | Waist -3cm |
| Maillard (2018, 189) | Total/abd/visceral ↓ | – | Running > cycling |
Encouraging: HIIT = quick cardiometabolic shield.
Who Leads? China-US Dominate Research Surge
USA tops (44 papers, 1447 cites), China (49 papers, 888), Canada (37,1200), Iran (21,309), England (18,1083). South America: Brazil/Chile (21/20 papers). Authors: Aubertin-Leheudre (2021-22), Kong Z. (2019), Little/Jung (2018).
Populations: Adults (24%), women (21%), men (13%), adolescents (8%), kids (6%). 93% pure overweight/obese; extras: diabetes (3%), postmenopause (2%), cancer (1%). 66% vague samples—call for details (age, BMI, fitness).
Table 2: HIIT Research by Population (Top, % of 282)
| Group | Papers | % | Notes |
|---|---|---|---|
| Adults | 67 | 24 | Broad gains |
| Females | 58 | 21 | Equal efficacy |
| Males | 37 | 13 | - |
| Adolescents | 22 | 8 | Youth focus rising |
| Children | 18 | 6 | Early intervention |
Women/kids underrepresented—prime targets.
HIIT vs Steady Cardio: Science Settles the Sprint
Reviews crown HIIT: Superior fat oxidation (catecholamines lipolysis), mito biogenesis, GLUT4 uptake. Running edges cycling (muscle recruit, EPOC). Protocols: 75-90% max, 30s-2min bursts, 4-12 weeks, 2-3x/week. Safe for obese? Yes—start moderate, ramp 5%/6 sessions.
Top interventions: Gillen (162 cites)—fasted/fed HIIT cuts fat in women; Fisher (140)—metabolic overhaul men. Enjoyment/adherence match MICT.
Global Call: HIIT for Public Health Revolution
2B overweight demands action: HIIT fits busy lives, trumps inactivity. WHO: 75-150min vigorous/week—HIIT nails it. Public systems: Supervised plans cut comorbidities. Gaps: Kids/men trials, protocols (duration/intensity), psychoneuro effects.
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