According to Digambar Jain principles, heart beat, walking, speaking, and digestion are not “karma” themselves. They are bodily or vital activities, and karma bondage happens because of the soul’s activities of mind, speech, and body, especially when there is attachment, aversion, negligence, or passions.

Simple understanding

• Heart beat: a natural bodily function; not karma by itself.
• Digestion: a natural bodily process; not karma by itself.
• Walking: bodily movement; can be an occasion for āsrava if done with carelessness or injury, but the movement itself is not karma.
• Speaking: speech activity; this can cause karma if it is false, harsh, divisive, useless, or done with passions.

Jain view in short

• Karma is attracted by the soul’s activities, not merely by the existence of body functions.
• All embodied beings continuously have some subtle activity, so some influx of karma is always possible.
• But involuntary functions like heartbeat and digestion are not usually treated as moral actions in the same way as intentional speech or deliberate movement.

Digambar emphasis

Digambar Jain texts emphasize that bondage is chiefly due to yoga with kaṣāya — that is, activity together with passions. So:

• Walking and speaking can create bondage depending on intention, carelessness, and passion.
• Heartbeat and digestion are bodily functions and are not considered deliberate karma-producing acts in the moral sense.

Final answer

No, not directly. In Digambar Jainism, heartbeat and digestion do not by themselves create karma, while walking and speaking can create karma when they involve yoga with passions, negligence, or harmful intent.

If you want, I can also explain this in the language of āsrava, bandh, yoga, and kaṣāya in a very simple Jain way.