/**
 * Literature-backed constants for pedometer-derived physiology metrics.
 *
 * References:
 * - Ainsworth BE et al. (2011) Compendium of Physical Activities Medicine & Science in Sports & Exercise.
 * - WHO (2020) Guidelines on physical activity and sedentary behaviour.
 * - Tudor-Locke C et al. (2018) Step cadence and intensity in adults: SCANDINAVIAN J Med Sci Sports.
 * - Google Fit Heart Points (1 min moderate = 1 HP, 1 min vigorous = 2 HP).
 * - ACSM metabolic calculation: kcal/min = (MET × 3.5 × kg) / 200.
 */
/** 1 MET ≡ 3.5 mL O₂·kg⁻¹·min⁻¹ (resting metabolic rate reference). */
export declare const MET_RESTING_VO2_ML_PER_KG_MIN = 3.5;
/** ACSM energy conversion divisor (kcal/min from MET × mass). */
export declare const ACSM_KCAL_DIVISOR = 200;
/** O₂ energy density ≈ 5.05 kcal·L⁻¹ (used in some lab derivations; ACSM uses compact form above). */
export declare const O2_ENERGY_KCAL_PER_LITER = 5.05;
/** Anthropometric stride factors (stride ≈ factor × height_m). */
export declare const STRIDE_FACTOR_WALK_MALE = 0.415;
export declare const STRIDE_FACTOR_WALK_FEMALE = 0.413;
export declare const STRIDE_FACTOR_WALK_NEUTRAL = 0.414;
/** Cadence thresholds (steps·min⁻¹) — Tudor-Locke et al. 2018 meta-analysis. */
export declare const CADENCE_LIGHT_MAX = 99;
export declare const CADENCE_MODERATE_MIN = 100;
export declare const CADENCE_VIGOROUS_MIN = 130;
/** MET band edges (Compendium walking codes 17151–17270). */
export declare const MET_LIGHT_MAX = 2.9;
export declare const MET_MODERATE_MIN = 3;
export declare const MET_MODERATE_MAX = 6;
export declare const MET_VIGOROUS_MIN = 6.1;
/** WHO weekly targets (minutes of moderate-equivalent activity). */
export declare const WHO_MODERATE_MINUTES_PER_WEEK = 150;
/** Google Fit weekly Heart Points goal. */
export declare const HEART_POINTS_WEEKLY_GOAL = 150;
/**
 * Walking speed (m·s⁻¹) → MET via Compendium piecewise linear interpolation.
 * Anchors: 0.89 m/s (2 mph)=2.8, 1.34 m/s (3 mph)=3.5, 1.79 m/s (4 mph)=5.0, 2.24 m/s (5 mph)=8.3
 */
export declare const WALKING_MET_BY_SPEED_MPS: ReadonlyArray<{
    speedMps: number;
    met: number;
}>;
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