"afterload" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "after",
        "3": "load"
      },
      "expansion": "after- + load",
      "name": "prefix"
    }
  ],
  "etymology_text": "From after- + load.",
  "forms": [
    {
      "form": "afterloads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "afterload (plural afterloads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with after-",
          "parents": [],
          "source": "w"
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        {
          "kind": "other",
          "langcode": "en",
          "name": "Physiology",
          "orig": "en:Physiology",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "The load on a working muscle from a constant opposing force"
      ],
      "id": "en-afterload-en-noun-vg3bXG3o",
      "links": [
        [
          "physiology",
          "physiology"
        ],
        [
          "load",
          "load"
        ],
        [
          "muscle",
          "muscle"
        ]
      ],
      "raw_glosses": [
        "(physiology) The load on a working muscle from a constant opposing force"
      ],
      "topics": [
        "medicine",
        "physiology",
        "sciences"
      ]
    }
  ],
  "word": "afterload"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "after",
        "3": "load"
      },
      "expansion": "after- + load",
      "name": "prefix"
    }
  ],
  "etymology_text": "From after- + load.",
  "forms": [
    {
      "form": "afterloads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "afterload (plural afterloads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English 3-syllable words",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with after-",
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      ],
      "glosses": [
        "The load on a working muscle from a constant opposing force"
      ],
      "links": [
        [
          "physiology",
          "physiology"
        ],
        [
          "load",
          "load"
        ],
        [
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        ]
      ],
      "raw_glosses": [
        "(physiology) The load on a working muscle from a constant opposing force"
      ],
      "topics": [
        "medicine",
        "physiology",
        "sciences"
      ]
    }
  ],
  "word": "afterload"
}