Director of Sport Science: @UMichWrestling PhD Student: Human & Sport Performance 🔙 Co-Founder: @DoYouRumble #TrainHardScienceHard
Ann Arbor, MI
Joined April 2010
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Rob Sulaver, MS, CSCS, CPSS retweeted
Huge thanks to @umichwrestling for letting us use their facility. Shoutout especially to @_Rob_Sulaver for leading the session with the team! Go Blue 〽️
When the hardwood met the mat.
Different sport.
Same standard.
Lasting results.
#GoBlue
It is calculated using a Countermovement Jump (CMJ) as follows: RSI mod = Jump Height (m) / Time to Takeoff (s)
Sunday's contrast bathing (sauna + cold plunge) produced a clean heart-rate pattern:
three smooth climbs to ~120 bpm, followed by rapid drops into the mid-40s.
From an exercise physiology standpoint, heat drives HR up through thermoregulation (skin blood flow, reduced venous return, cardiac output doing its job). The sharp drops that follow reflect a strong parasympathetic rebound, triggered by CWI. Think of it as the nervous system slamming the brakes after revving the engine.
It’s not exactly cardio, although the comparison is common. It’s better understood as autonomic stress and release.
Important to note:
this is not exercise HR recovery and shouldn’t be compared to HRR norms. Different stimulus, different rules.
What it does highlight is autonomic flexibility - the ability to move quickly between stress and recovery. That’s a useful trait, just not one you PR.
Heat and cold don’t replace training, but they’re a good reminder that recovery is a physiological skill.
Corporate America should normalize eating at your desk but taking a daily workout break. The hours balance out, but the benefits for health and productivity are a clear net positive.
