American journal of physiology. Endocrinology and metabolism2026n = 12
RCTHuman
This study set out to compare how different types of exercise affect muscle metabolism and insulin sensitivity in the short term. Twelve healthy young men did three sessions: sprint intervals…
Health science reports2026n = 30
RCTHuman
This study compared how two types of high-intensity exercise affect hunger hormones, appetite, and body composition in overweight and obese men. Thirty men were split into groups doing either running-based…
European journal of applied physiology2026n = 14 (7 per group)
RCTHuman
This study set out to see if sprint interval training while deliberately breathing less (voluntary hypoventilation, or VHL) could boost both aerobic and anaerobic energy systems in young men. Fourteen…
PeerJ2026n = 251
Systematic ReviewHuman
This study set out to clarify how testosterone levels change after a single bout of exercise, given conflicting findings in past research. It reviewed 15 randomized controlled trials with 251…
Frontiers in sports and active living2026n = Males: 47 (12 hypoxia, 12 heat, 23 control). Females: 45 (10 hypoxia, 14 heat, 21 control)
RCTHuman
This study compared two ways of making sprint training harder: doing it in thin air, and doing it in the heat. Healthy men and women trained twice a week for…
BMC public health2026n = 56 (28 HIIT, 28 control)
RCTHuman
This study tested whether a six-week, unsupervised high-intensity interval training (HIIT) running program on campus could improve fitness, sleep, and body composition in sedentary male university students. Fifty-six students were…
Journal of exercise science and fitness2026n = 20
RCTHuman
This study looked at whether a quick, low-effort high-intensity interval training routine (REHIT) could improve blood sugar control after meals and over a full day in healthy, active middle-aged men.…
International journal of sport nutrition and exercise metabolism2026n = 10
RCTHuman
This study compared two cardio styles for building muscle when matched for total work and time: HIIT (high-intensity interval training, short bursts of hard effort with rests between) and MICT…
PeerJ2025n = 22 participants
RCTHuman
This study compared two ways of organising the same lifting session in untrained young men. The test method was cluster set resistance training, meaning a set is broken into small…
Frontiers in endocrinology2025n = 304
CohortHuman
This study looked at how different types of exercise affect body composition during weight loss. It compared resistance training, aerobic exercise, and no exercise in 304 adults on a calorie-restricted…
Scientific reports2025n = 11
OtherHuman
This study measured what happens to scrotal temperature during a run. Eleven trained long-distance runners ran on a treadmill for 60 minutes at 60% of their maximum aerobic capacity, in…
Nutrients2025n = 38 (20 placebo, 18 ashwagandha)
RCTHuman
This study set out to see whether ashwagandha, a herb widely sold for stress and performance, adds anything to interval training. Interval training here meant repeated hard efforts on a…
International journal of andrology2008n = 25
OtherHuman
It has been suggested that cycling warms the testicles as a ride goes on, and that this in turn harms semen quality. This study tested the first half of that…
Human reproduction (Oxford, England)2005n = 50
RCTHuman
This study set out to see how different types of underwear and physical activity affect scrotal temperature, which in turn affects testicular temperature. Fifty healthy men with normal fertility had…