diff --git a/7t_trt/participant+sessions.json b/7t_trt/participant+sessions.json
new file mode 100644
index 000000000..6c8463bc7
--- /dev/null
+++ b/7t_trt/participant+sessions.json
@@ -0,0 +1,7 @@
+{
+    "body_weight": {
+        "Description": "body weight of the participant at the time of the session",
+        "Format": "number",
+        "Units": "kg"
+    }
+}
diff --git a/7t_trt/participant+sessions.tsv b/7t_trt/participant+sessions.tsv
new file mode 100644
index 000000000..e0e4eb5a6
--- /dev/null
+++ b/7t_trt/participant+sessions.tsv
@@ -0,0 +1,45 @@
+participant_id	session_id	age	body_weight
+sub-01	ses-1	29	81.3
+sub-01	ses-2	30	83.1
+sub-02	ses-1	23	55.2
+sub-02	ses-2	23	55.8
+sub-03	ses-1	25	78.4
+sub-03	ses-2	25	77.9
+sub-04	ses-1	26	92.1
+sub-04	ses-2	26	91.5
+sub-05	ses-1	27	70.3
+sub-05	ses-2	28	71.8
+sub-06	ses-1	23	58.7
+sub-06	ses-2	23	59.2
+sub-07	ses-1	29	85.6
+sub-07	ses-2	29	84.9
+sub-08	ses-1	25	73.2
+sub-08	ses-2	25	74.1
+sub-09	ses-1	25	68.9
+sub-09	ses-2	25	69.3
+sub-10	ses-1	24	76.5
+sub-10	ses-2	24	77.2
+sub-11	ses-1	30	88.4
+sub-11	ses-2	31	87.1
+sub-12	ses-1	24	65.8
+sub-12	ses-2	24	66.3
+sub-13	ses-1	26	61.4
+sub-13	ses-2	26	62.0
+sub-14	ses-1	24	57.9
+sub-14	ses-2	24	58.5
+sub-15	ses-1	22	52.3
+sub-15	ses-2	22	53.1
+sub-16	ses-1	23	63.7
+sub-16	ses-2	23	64.2
+sub-17	ses-1	25	79.8
+sub-17	ses-2	26	80.5
+sub-18	ses-1	27	90.2
+sub-18	ses-2	27	89.7
+sub-19	ses-1	25	74.6
+sub-19	ses-2	25	75.1
+sub-20	ses-1	22	54.8
+sub-20	ses-2	22	55.4
+sub-21	ses-1	24	67.3
+sub-21	ses-2	24	68.0
+sub-22	ses-1	25	82.1
+sub-22	ses-2	26	83.4