Endocr Connect. 2017 Aug 9;6(7):430-436. doi: 10.1530/EC-17-0159. Print 2017 Oct.
[style=font-weight: bold;]HIIT produces increases in muscle power and free testosterone in male masters athletes[/style]
Herbert P1, Hayes LD2, Sculthorpe NF3, Grace FM4.
High-intensity interval training (HIIT) improves peak power output (PPO) in sedentary aging men but has not been examined in masters endurance athletes. Therefore, we investigated whether a six-week program of low-volume HIIT would (i) improve PPO in masters athletes and (ii) whether any change in PPO would be associated with steroid hormone perturbations. Seventeen male masters athletes (60?±?5 years) completed the intervention, which comprised nine HIIT sessions over six weeks. HIIT sessions involved six 30-s sprints at 40% PPO, interspersed with 3?min active recovery.
Absolute PPO (799?±?205?W and 865?±?211?W) and relative PPO (10.2?±?2.0?W/kg and 11.0?±?2.2?W/kg) increased from pre- to post-HIIT respectively (P?<?0.001, Cohen’s d?=?0.32?0.38). No significant change was observed for total testosterone (15.2?±?4.2?nmol/L to 16.4?±?3.3?nmol/L (P?=?0.061, Cohen’s d?=?0.32)), while a small increase in free testosterone occurred following HIIT (7.0?±?1.2?ng/dL to 7.5?±?1.1?ng/dL pre- to post-HIIT (P?=?0.050, Cohen’s d?=?0.40)).[style=font-weight: bold;]Six weeks’ HIIT improves PPO in masters athletes and increases free testosterone. T[/style]aken together, these data indicate there is a place for carefully timed HIIT epochs in regimes of masters athletes.
[style=font-weight: bold;]HIIT produces increases in muscle power and free testosterone in male masters athletes[/style]
Herbert P1, Hayes LD2, Sculthorpe NF3, Grace FM4.
Abstract
High-intensity interval training (HIIT) improves peak power output (PPO) in sedentary aging men but has not been examined in masters endurance athletes. Therefore, we investigated whether a six-week program of low-volume HIIT would (i) improve PPO in masters athletes and (ii) whether any change in PPO would be associated with steroid hormone perturbations. Seventeen male masters athletes (60?±?5 years) completed the intervention, which comprised nine HIIT sessions over six weeks. HIIT sessions involved six 30-s sprints at 40% PPO, interspersed with 3?min active recovery.
Absolute PPO (799?±?205?W and 865?±?211?W) and relative PPO (10.2?±?2.0?W/kg and 11.0?±?2.2?W/kg) increased from pre- to post-HIIT respectively (P?<?0.001, Cohen’s d?=?0.32?0.38). No significant change was observed for total testosterone (15.2?±?4.2?nmol/L to 16.4?±?3.3?nmol/L (P?=?0.061, Cohen’s d?=?0.32)), while a small increase in free testosterone occurred following HIIT (7.0?±?1.2?ng/dL to 7.5?±?1.1?ng/dL pre- to post-HIIT (P?=?0.050, Cohen’s d?=?0.40)).[style=font-weight: bold;]Six weeks’ HIIT improves PPO in masters athletes and increases free testosterone. T[/style]aken together, these data indicate there is a place for carefully timed HIIT epochs in regimes of masters athletes.
