HIIT: High-Intensity Interval Training Science

Status: draft · Confidence: medium (0.625) · Basis: verified_sources

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## TL;DR

High-Intensity Interval Training (HIIT) alternates short bursts (20-90 seconds) of near-maximal effort with recovery periods. HIIT produces comparable cardiovascular and metabolic adaptations to moderate-intensity continuous training (MICT) in 40-60% less time. A typical protocol (Tabata, 1996) uses 20 seconds all-out effort + 10 seconds rest, repeated 8 times (4 minutes total), improving VO2max by 14% over 6 weeks.

## Core Explanation

HIIT protocols vary by work/rest ratio: Tabata (2:1), 30-20-10 (30s moderate, 20s fast, 10s sprint), 4×4 (4 min at 90-95% HRmax, 3 min active recovery). Physiological mechanisms: (1) Mitochondrial biogenesis — HIIT increases PGC-1α activation (the "master regulator" of mitochondrial growth) more than MICT within the same time, (2) Excess post-exercise oxygen consumption (EPOC) — HIIT elevates metabolic rate for 12-24h post-exercise vs ~2h for MICT, (3) Improved insulin sensitivity by 25-35% after 2-3 weeks. Risks: HIIT has a 2-4x higher injury rate than MICT (mainly overuse injuries); not recommended more than 3x/week. American College of Sports Medicine (ACSM) recommends 1-2 HIIT sessions per week as part of a balanced program. Popular implementations: CrossFit (mixed-modal), Orangetheory (heart-rate zone training), Peloton HIIT classes.

## Detailed Analysis

[详细分析、统计数据、历史发展和进一步阅读。待后续补充。]

## Further Reading

- [Source 1 — HIIT: High-Intensity Interval Training Science](https://www.acsm.org/)

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