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脉冲宽度（pulse width）比频率更影响深层刺激，50-250μs适合浅层镇痛，250-400μs可达深层肌肉，商品若只标频率不标脉宽说明参数不完整

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低频理疗仪category

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Unverified脉冲宽度（脉宽）是被忽视但关键的参数：脉宽越大刺激越深越强，深层肌肉/大块肌群需150-250μs，浅表神经痛用50-100μs即可，选购时应确认脉宽可调而非固定值90% similar Unverified1MHz频率超声穿透深度较深（约3-5cm），适合深层软组织和关节问题；若主要需求是浅表皮肤美容或浅层肌肉放松，该频率并非最优选择79% similar Unverified中频电疗（1000-5000Hz）穿透深度大于低频（1-1000Hz），适合深层肌肉与关节镇痛；低频对表层神经刺激明显但易产生刺痛感，膝骨关节炎深部疼痛优先选带中频或中频调制模式的机型79% similar UnverifiedEMS纤体仪针对腹部塑形时，输出频率在30-50Hz、脉宽200-400μs区间才能有效激活深层肌肉；很多低价机型只做体表刺痛感（高频低强度），无法引发肌肉收缩，实际减脂塑形作用有限79% similar Unverified颈椎按摩仪选择低频脉冲（TENS）类型时，电流强度需支持15档以上调节，脉冲频率覆盖1-100Hz，否则难以适配深层肌肉与浅层放松的不同需求79% similar

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