The making of The Heart Cycle commenced in 1973 with a 'live' real-time, closed-circuit television (CCTV) solo, private performance, recorded to videotape. Live in the sense of performed iterations, proceeding toward the work's final completed duration, determined by the running time of  a 1950s era, 16mm, biology, instructional film of the same title.

Reference: "The transforming moves and exploratory probes employed in performing the mediums, (film and analogue video), is reflected in the heuristic production of evidence in viewing the completed artwork; light as abstract movement, with synchronous/asynchronous sound, as image of place and surface, as image of presence and agency, interrogated within a continuous present." (Kacunko)
exhibition: The work was selected for the Video Show 1975, serpentine Gallery, London. and REWIND, ‘Early British Video Art,DVD’ box set pub. 2009 Lux, London.

See also a later iteration The Heart Cycle 2021