Sex Differences in Recovery From Sprint Interval Exercise. Issue 2 (February 2022)

• Record Type: Journal Article
• Authors: Forsyth, Jacky J.; Burt, Dean
• Is Part Of: Journal of strength and conditioning research. Volume 36:Issue 2(2022)
• Publication Date: 2022-02
• Subjects: lipid metabolism -- women -- weight loss -- high-intensity interval training; Physical education and training -- Periodicals; Weight training -- Physiological aspects -- Periodicals; Physical fitness -- Periodicals; 613.7
• DOI: 10.1519/JSC.0000000000003460
• Languages: English
• ISSNs: 1064-8011

Abstract

Abstract : Abstract: Forsyth, JJ and Burt, D. Sex differences in recovery from sprint interval exercise. J Strength Cond Res 36(2): e41–e48, 2022—The purpose of the study was to examine whether there were differences between men and women in energy metabolism after a bout of sprint interval training (SIT). Sixteen men (mean ± SD [95% confidence interval] for age, stature, body mass, and fat-free mass [FFM] of 25.4 ± 5.9 [22.3–28.6] years, 181.3 ± 7.0 [177.6–185.0] cm, 82.7 ± 13.3 [75.6–89.8] kg, and 69.0 ± 10.6 [63.4–74.6] kg FFM, respectively) and 16 eumenorrheic women (26.1 ± 5.5 [23.1–29.8] years, 164.1 ± 8.7 [159.5–168.7] cm, 72.0 ± 15.4 [63.8–80.2] kg, and 51.6 ± 8.5 [47.0–56.1] kg FFM), tested in the mid-luteal phase of their menstrual cycle, completed a SIT protocol, consisting of 4 × 30-seconds Wingate sprints at 0.065% FFM. Respiratory variables were used to estimate energy metabolism after (post-SIT) and 24 hours after the bout of SIT (24 hours post-SIT). Compared with women, men had significantly higher post-SIT mean fat oxidation rates (0.10 g·min −1 and 0.17 g·min −1, respectively, F (1, 30) = 34.82, p < 0.001, = 0.54), energy expenditure (1.28 ± 0.26 and 1.82 ± 0.40 kcal·min −1, respectively, F (1, 30) = 20.759, p < 0.001, = 0.41), excess post-exercise oxygen consumption values (1.91 ± 0.60 and 3.02 ± 1.58 L, F (1, 30) = 6.882, p < 0.014, = 0.19), and lower relative carbohydrate oxidation rates (0.0007 ± 0.0013 and 0.0018 ± 0.0007 g·min −1 per kg FFM, respectively, F (1, 30) = 10.506, p < 0.003, = 0.26). The higher metabolic values post-SIT for the men compared with the women might be explained by the men having a greater FFM and having exercised at a higher exercise intensity. Practically, these findings could mean that, if prescribing SIT as a strength and conditioning professional, men and women could respond differently in terms of energy expenditure after exercise.