Fig. 3. Association between baseline characteristics and inflight countermeasures with change in.

(a) muscle, (b) body composition, (c) bone health and (d) cardiorespiratory fitness. Correlations are color-coded to reflect magnitude with darker colors reflecting higher correlation. Abbreviations: RM repetition maximum, CSA cross-sectional area, BMD bone mineral density, TM treadmill, CE cycle ergometer, VO₂peak peak oxygen consumption, time above 70% and 90%, time in heart rate zone above 70% and 90% of peak heart rate, respectively. Data are rank-based Somers’ D.